Research Library
52 peer-reviewed studies we've reviewed, organized by health topic. Each study includes population, methods, findings, and limitations.
Joint health and comfort
Analgesic efficacy of collagen peptide in knee osteoarthritis: a meta-analysis of randomized controlled trials
Adults with knee osteoarthritis across randomized trials
Pooled evidence favored collagen for symptomatic knee osteoarthritis relief, especially pain outcomes, with mixed but directionally positive function findings.
This is the fastest way to explain why joint pain is one of the stronger collagen categories.
Limitations: Trials were heterogeneous, mostly short, and still focused on symptom outcomes rather than structural disease modification.
View source →Impact of Specific Bioactive Collagen Peptides on Joint Discomforts in the Lower Extremity during Daily Activities
182 adults with functional knee or hip pain
Participants taking collagen reported less pain during selected daily activities such as walking, kneeling, and climbing stairs.
Useful bridge study between formal osteoarthritis trials and everyday joint-discomfort questions.
Limitations: Applies to a specific peptide product and discomfort population, not necessarily all joint users or all collagen products.
View source →Effect of supplementation with type 1 and type 3 collagen peptide and type 2 hydrolyzed collagen on osteoarthritis-related pain, quality of life, and physical function
31 adults with grade 2-3 osteoarthritis
The collagen arm improved several pain, quality-of-life, and function scales over the study period.
Adds newer 2025 trial support for symptom and quality-of-life framing.
Limitations: Small sample, multi-collagen formulation, and short duration limit generalization.
View source →Evaluation of the Efficacy and Safety of CollaSel PRO Type I and Type III Hydrolyzed Collagen Peptides in the Treatment of Osteoarthritis
160 adults with osteoarthritis
The collagen group showed clinically meaningful improvements in pain, stiffness, and physical function versus placebo.
This is one of the larger recent OA trials and strengthens the joint-symptom use case.
Limitations: Short study window and sponsor involvement mean it should still sit inside a cautious evidence page.
View source →Efficacy and safety of collagen derivatives for osteoarthritis: A trial sequential meta-analysis
35 RCTs / 3165 patients with OA
Collagen derivatives demonstrated small-to-moderate effects on pain (SMD -0.35) with high certainty and significant function improvement (SMD -0.31). Trial sequential analysis confirmed evidence is robust.
Trial sequential analysis adds a layer of certainty beyond a standard meta-analysis, strengthening confidence in the pain-relief signal.
Limitations: Substantial heterogeneity across included trials in collagen type, dosage, and OA severity.
View source →Effect of collagen supplementation on knee osteoarthritis: an updated systematic review and meta-analysis of randomised controlled trials
11 RCTs / 870 participants
Pooled analysis revealed statistically and clinically significant improvements in both functional and pain scores favoring collagen supplementation.
An updated 2025 meta-analysis that reinforces earlier pooled findings and narrows the evidence gap for knee OA specifically.
Limitations: Substantial heterogeneity (I²=75% function, 88% pain). Limited to knee OA only.
View source →Oral administration of hydrolyzed collagen alleviates pain and enhances functionality in knee osteoarthritis
120 adults with grade II-III knee OA
Treatment group showed 43.6% decrease in VAS pain, 38.8% improvement in Lequesne index, and marked reduction in inflammatory markers (56.2% CRP drop). Only 3.3% needed analgesics vs 41.7% in placebo.
One of the larger and longer RCTs in knee OA, with objective inflammatory markers alongside subjective symptom scores.
Limitations: Cytokine levels not assessed. Diet, physical activity, and stress not rigorously controlled. Single-center.
View source →Efficacy and safety of low-molecular-weight collagen peptides in knee osteoarthritis: a randomized, double-blind, placebo-controlled trial
80 adults aged 40-75 with grade I-II knee OA
LMCP significantly reduced pain and improved physical function on WOMAC scores with no serious adverse events.
Demonstrates efficacy at a lower 3g/day dose from marine source, relevant for consumers using fish-derived collagen.
Limitations: Single-center. Only 60 of 80 completed per-protocol. No structural cartilage improvements on imaging.
View source →Skin hydration and elasticity
Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
23 randomized trials with 1474 participants
Overall pooled results were positive, but the benefit disappeared in high-quality and non-industry-funded subgroup analyses.
This is the key skepticism paper that keeps the skin category honest.
Limitations: Subgroup interpretation can still be sensitive to how trial quality and funding are classified.
View source →Effects of collagen-based supplements on skin's hydration and elasticity: A systematic review and meta-analysis
10 randomized trials with 646 participants
The pooled analysis reported statistically significant gains in hydration and elasticity, with many studies clustering around multi-gram daily doses.
Gives the positive side of the latest skin evidence picture.
Limitations: The included studies were small, mostly female, and often had unclear risk of bias.
View source →Skin Anti-Aging and Moisturizing Effects of Low-Molecular-Weight Collagen Peptide Supplementation in Healthy Adults
70 healthy adults
The test group showed better wrinkle and moisture-related skin measures across several assessments.
Fresh RCT support helps the skin page feel current rather than dependent on older cosmetic studies.
Limitations: Single formulation, healthy-adult population, and short follow-up limit the strength of broad skin claims.
View source →Immune-Modulatory Effects of Bioactive Collagen Peptides Improve Skin Health in Middle-Aged Women
119 healthy sedentary women aged 35-55 years
The 10 g/day group showed significant wrinkle improvements and favorable skin-property changes, alongside reported immune-signaling shifts.
This is the newest skin RCT in the current research layer and keeps the skin brief current through early 2026.
Limitations: Single product, female-only population, and no placebo arm mean it should still be interpreted inside the broader mixed-evidence skin picture.
View source →The Efficacy and Safety of CollaSel Pro Hydrolyzed Collagen Peptide Supplementation Without Addons in Improving Skin Health in Adult Females
112 adult females
Significantly improved skin elasticity (p=0.009), hydration (p=0.003), and roughness (p=0.002). Notable: pure collagen without add-on ingredients.
Isolates the collagen effect without confounders from added vitamins or antioxidants, strengthening the case for collagen itself.
Limitations: 8-week duration shorter than typical 12-week trials. Female-only. 10g dose higher than most studies.
View source →The Sustained Effects of Bioactive Collagen Peptides on Skin Health: A Randomized, Double-Blind, Placebo-Controlled Clinical Study
77 healthy female participants
20.12% decrease in TEWL, 17.39% increase in moisture, 26.33% dermal density enhancement. Benefits sustained through 4-week washout period.
The washout data showing sustained benefits is rare and valuable for consumer confidence in lasting effects.
Limitations: Female-only. Short washout period. Single-center.
View source →Oral Collagen Oligopeptides as a Modulator of Skin Health: A Comprehensive Evaluation of Clinical and Molecular Effects
85 women aged 45-60
Significantly enhanced firmness and elasticity. In-vitro component showed upregulated type I collagen synthesis and suppressed MMP-1. Hydration improvement non-significant.
Combines clinical outcomes with mechanistic in-vitro data, offering a plausible biological explanation for observed skin benefits.
Limitations: Hydration non-significant at 2.5g dose. In-vitro mechanism may not operate the same in vivo after oral ingestion.
View source →Influence of Collagen Peptide Supplementation on Visible Signs of Skin and Nail Health and Aging in an East Asian Population
85 healthy women aged 43-65 (East Asian)
Significant improvements in dermis density and skin moisture. Wrinkle visibility reduced and nail appearance improved. One of few RCTs in an East Asian population.
Extends the evidence base beyond predominantly Western populations, important for global market relevance.
Limitations: Single ethnic population. Wrinkle/nail outcomes partly subjective. Relatively small sample.
View source →Muscle support and recovery
Impact of Collagen Peptide Supplementation in Combination with Long-Term Physical Training on Strength, Musculotendinous Remodeling, Functional Recovery, and Body Composition in Healthy Adults
19 studies, 768 adults
Review-level evidence supported modest gains in fat-free mass, tendon morphology, maximal strength, and some recovery outcomes when collagen was paired with physical training.
This is the best current single summary for the training-adjunct use case.
Limitations: Certainty ranged from moderate to very low depending on the outcome, especially for tendon mechanics.
View source →Collagen Peptide Supplementation Enhances Muscle-Tendon Stiffness and Explosive Strength
50 healthy young sedentary men
The collagen group increased muscle-tendon stiffness and improved explosive strength measures.
Shows that some training-related benefits may be mechanical or connective-tissue-mediated, not classic muscle-protein effects.
Limitations: Healthy young men only; outcome relevance depends on the user's goals and sport context.
View source →Efficacy of collagen peptide supplementation on bone and muscle health: a meta-analysis
Pooled RCTs in older adults and osteoporosis-risk populations
Collagen significantly improved muscle performance (SMD 0.60, I²=0%). Femoral neck and spine BMD also improved. Synergistic effects with vitamin D and calcium.
Provides pooled evidence for muscle performance alongside bone density, relevant for older adult positioning.
Limitations: Significant heterogeneity in BMD outcomes (I²=80.1%). Variable doses, durations, populations.
View source →Effects of 24 weeks of collagen supplementation in active adults: Impact on body composition, neuromuscular and cardiorespiratory fitness
90 adults aged 45-65
Significant improvement in counter-movement jump (p=0.032). 72.1% of collagen group reported improved musculoskeletal discomfort vs 10.3% placebo.
One of the longer-duration RCTs (24 weeks) in active middle-aged adults, combining exercise with collagen supplementation.
Limitations: Collagen supplement contained added minerals and vitamins. Industry-affiliated co-author.
View source →Collagen Peptide Supplementation during Training Does Not Further Increase Connective Tissue Protein Synthesis Rates
25 young men
Despite increased plasma glycine, proline, and hydroxyproline, collagen did NOT increase myofibrillar or muscle connective protein synthesis rates compared to placebo.
Important null finding that tempers overclaiming about collagen and direct muscle protein synthesis in young trained individuals.
Limitations: Only 1-week intervention. Small sample size.
View source →Protein quality and post-workout use
The Effects of Ingesting a Single Bolus of Hydrolyzed Collagen versus Free Amino Acids on Muscle Connective Protein Synthesis Rates
45 recreationally active young adults
Collagen increased circulating amino acids but did not increase myofibrillar or muscle connective protein synthesis beyond placebo in this acute setting.
This is the clearest modern guardrail against treating collagen like whey for post-workout muscle building.
Limitations: Acute physiology study, not a long-term training intervention, so it answers a narrow but important question.
View source →Ingestion of a Whey Plus Collagen Protein Blend Increases Myofibrillar and Muscle Connective Protein Synthesis Rates
28 young men
The whey-plus-collagen blend increased both myofibrillar and connective tissue protein synthesis markers in early recovery.
Suggests the smartest sports-nutrition framing may be blend logic, not collagen-alone logic.
Limitations: Not a collagen-only study, so it cannot be used to justify pure collagen as an equivalent anabolic protein.
View source →Partly Substituting Whey for Collagen Peptide Supplementation Improves Neither Indices of Muscle Damage Nor Recovery During Eccentric Exercise Training
22 young fit males
No differences in muscle damage indices, CK levels, or functional recovery. Substituting whey for collagen within isonitrogenous dose provided no added benefit.
Important null finding: replacing part of whey with collagen did not harm or help recovery, relevant for managing consumer expectations about collagen as a workout protein.
Limitations: Small sample (n=11/group). Only 3 weeks. Compared blend vs whey, not collagen vs placebo.
View source →Tendon and ligament support
Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis
Healthy active adults
The protocol increased a collagen-synthesis marker after exercise, making it the most-cited timing study in tendon-support conversations.
It explains why tendon-focused collagen advice often centers on timing and loading instead of passive daily use.
Limitations: Mechanistic and acute; it does not by itself prove clinical tendon healing in injured patients.
View source →Collagen Supplementation Augments Strength Training-Induced Gains in Tendon Size and Rate of Force Development in Elite Female Master Field Hockey Athletes
Elite female master field hockey athletes
Collagen supplementation augmented gains in tendon size and rate of force development during the training block.
Provides a newer training-based tendon paper that feels much closer to the real-world tendon-support narrative than older mechanistic work alone.
Limitations: Highly specific athletic population and protocol; results may not generalize to everyday rehab users.
View source →Hydrolysed Collagen Supplementation Enhances Patellar Tendon Adaptations to 12 Weeks’ Resistance Training in Middle-Aged Men
20 recreationally active middle-aged men (age 47±5)
Patellar tendon CSA increased more in collagen (+6.8mm²) than placebo (+1.2mm², p=0.027). Stiffness +661 vs +247 N/mm (p=0.009). Young’s modulus also significantly higher.
First RCT showing structural tendon hypertrophy (CSA) from collagen in a recreational middle-aged population.
Limitations: Small sample (n=20). Only patellar tendon. Only men studied.
View source →High-intensity resistance training and collagen supplementation improve patellar tendon adaptations in professional female soccer athletes
11 professional female soccer athletes
Patellar tendon stiffness increased +15.4% (d=0.81) in collagen vs +4.6% in placebo (p=0.002). Young’s modulus +14.2% vs +3.4% (p=0.004).
Evidence in elite female athletes, an under-studied population, showing meaningful tendon stiffness improvements.
Limitations: Very small sample (n=11). Professional athletes may not represent general population.
View source →Hydrolyzed collagen supplementation prior to resistance exercise augments collagen synthesis in a dose-response manner in resistance-trained, middle-aged men
8 resistance-trained men (age 49±8)
PINP AUC significantly higher for 30g (169) than 15g (134) and both higher than 0g (96). Exercise alone did NOT increase PINP in middle-aged men, suggesting connective tissue anabolic resistance.
Establishes a dose-response relationship for collagen synthesis markers, and introduces the concept of connective tissue anabolic resistance in middle age.
Limitations: Very small sample (n=8). PINP is systemic marker, not tissue-specific. Acute response only.
View source →Collagen Peptide Supplementation Enhances Muscle-Tendon Stiffness and Explosive Strength: A 16-Week Randomized Controlled Trial
50 healthy young sedentary males (25 per group)
Achilles tendon stiffness increased significantly in the collagen group (P<0.001, d=0.378). Medial gastrocnemius stiffness also increased (P<0.001, d=0.594). Rate of torque development improved significantly (P<0.001, d=0.525). No changes in muscle or tendon cross-sectional area. No significant changes in placebo group.
Demonstrates that collagen peptides can increase tendon stiffness even in sedentary individuals without structured resistance training, broadening the applicability of tendon-support claims beyond athletes.
Limitations: Sedentary young males only; measured only ankle plantar flexion; unknown generalizability to active, older, or female populations.
View source →Effects of Specific Collagen Peptide Supplementation Combined with Resistance Training on Achilles Tendon Properties
40 healthy male volunteers (age 26.3 ± 4.0 years)
Achilles tendon CSA increased +11.0% in the collagen group vs +4.7% in placebo (P=0.002). Muscle thickness increased +7.3% vs +2.7% (P=0.014). Tendon stiffness and muscle strength increased in both groups with no between-group difference.
Provides direct Achilles tendon morphology evidence complementing patellar tendon studies. The +11% vs +4.7% CSA difference is a meaningful structural adaptation.
Limitations: Young healthy males only; no female participants; no clinical tendon population.
View source →Specific Collagen Peptides Increase Adaptations of Patellar Tendon Morphology Following 14-Weeks of High-Load Resistance Training: A Randomized-Controlled Trial
50 healthy, moderately active male participants
Significantly greater increase in patellar tendon CSA at 60% and 70% of tendon length in collagen group vs placebo. No between-group difference in tendon stiffness or muscle strength (both groups increased similarly).
Confirms patellar tendon hypertrophy from collagen supplementation in a separate research group from the Liverpool studies, adding independent replication.
Limitations: Males only; healthy population only; mechanisms of tendon hypertrophy remain unknown.
View source →The Effect of Specific Bioactive Collagen Peptides on Tendon Remodeling During 15 wk of Lower Body Resistance Training
39 young, healthy, recreationally active men (19 collagen, 20 placebo)
No significant between-group differences in any tendon adaptation. Both groups showed within-group increases in patellar tendon stiffness (CP: +17.3%; PLA: +20.9%), Young's modulus, and decreased elongation/strain. Conclusion: collagen supplementation did not enhance resistance-training-induced tendon remodeling.
Important negative result that provides balance to the evidence base. Raises questions about whether dose (15g vs 5g), peptide specificity, or population factors explain the discrepancy with positive trials.
Limitations: Young healthy males only; contradicts findings from other RCTs using 5g doses, raising questions about dose-response or peptide formulation specificity.
View source →Collagen Supplementation Augments Changes in Patellar Tendon Properties in Female Soccer Players
17 U21 female soccer players (FA Women's Super League, age 17 ± 0.9 years)
Patellar tendon stiffness increased +18.0 ± 12.2% in collagen vs +5.1 ± 10.4% in placebo (P=0.049, d=1.11). Young's modulus increased +17.3 ± 11.9% vs +4.8 ± 10.3% (P=0.035). No change in knee extension strength or muscle thickness in either group.
Extends the Liverpool group's patellar tendon work to younger female athletes in an in-season context. The large effect size (d=1.11) for tendon stiffness is notable.
Limitations: Small sample (n=17); single team/squad; no tendon CSA change detected; unclear whether stiffness improvements translate to injury reduction.
View source →Oral Supplementation of Specific Collagen Peptides Combined with Calf-Strengthening Exercises Enhances Function and Reduces Pain in Achilles Tendinopathy Patients
20 adults with chronic mid-portion Achilles tendinopathy
VISA-A score improved by 12.6 points (95% CI: 9.7-15.5) in collagen-first group at 3 months vs 5.3 points (95% CI: 2.3-8.3) in placebo-first group. After crossover, improvements tracked with active supplement in both groups.
The only RCT testing collagen in a clinical tendinopathy population rather than healthy volunteers. Demonstrates clinical relevance beyond biomarkers and structural measurements.
Limitations: Small pilot study (n=20); crossover design with potential carryover effects; published 2019 but remains the only Achilles tendinopathy-specific collagen RCT.
View source →Does Additional Dietary Supplementation Improve Physiotherapeutic Treatment Outcome in Tendinopathy? A Systematic Review and Meta-Analysis
6 RCTs, 241 participants with tendinopathy
Supplementation plus physiotherapy significantly improved pain reduction (SMD=-0.74, 95% CI -1.37 to -0.10, P<0.05). No significant improvement in functional outcomes when supplementation was added. Collagen-specific studies included TENDOFORTE for Achilles tendinopathy and hydrolyzed collagen type I with ESWT.
Review-level evidence that dietary supplementation (including collagen) can reduce pain in clinical tendinopathy populations when added to physiotherapy.
Limitations: Only 6 studies met inclusion criteria; small total sample; heterogeneous supplement compositions; limited to tendinopathy populations.
View source →Sleep and overnight recovery
Collagen peptide supplementation before bedtime reduces sleep fragmentation and improves cognitive function in physically active males with sleep complaints
13 physically active men with sleep complaints
Polysomnography showed fewer awakenings with collagen, with additional cognitive signals the next day.
This is the key paper behind the emerging sleep story.
Limitations: Very small, male-only, active population and short duration make this a preliminary finding rather than a broad sleep claim.
View source →Dietary Collagen Peptides Ameliorate the Mood Status of Fatigue and Vigor: A Randomized, Double-Blinded, Placebo-Controlled Trial
66 healthy but easily fatigued adults
Fatigue after sleep significantly lower in collagen group (p=0.038). Vigor-Activity significantly higher (p=0.002). First RCT showing collagen reduces next-morning fatigue.
First RCT directly linking collagen peptides to reduced morning fatigue and improved vigor, strengthening the sleep/recovery narrative.
Limitations: Small sample. Subjective measures only. No objective sleep monitoring. Funded by Nippi Inc.
View source →The effect of glycine administration on the characteristics of physiological systems in human adults: A systematic review
Adult humans across 52 studies
Nervous system showed most positive effects. Longer-term glycine improved sleep in healthy populations. Authors concluded glycine has geroprotective potential.
Glycine is the most abundant amino acid in collagen; this review supports the mechanistic link between collagen’s glycine content and sleep benefits.
Limitations: Sleep studies had small samples with high bias risk. Most short duration (max 14 days healthy). Authors call for larger studies.
View source →Digestive and gut support
Collagen peptide promotes DSS-induced colitis by disturbing gut microbiota and regulation of macrophage polarization
Mouse DSS-colitis model
In this model, collagen peptide worsened inflammatory and microbiota outcomes.
This is a strong caution signal against assuming all collagen peptides are automatically gut-supportive.
Limitations: Animal study, disease model, and marine source; not a direct test of human digestive-health supplementation.
View source →The Alleviating Effect of Abalone Viscera Collagen Peptide in DSS-Induced Colitis Mice
Mouse DSS-colitis model
The peptide improved inflammatory cytokines, oxidative stress markers, and gut-microbiota measures in this model.
Shows why digestive collagen evidence is still source-specific and preclinical rather than consumer-ready.
Limitations: Animal-only evidence and a highly specific peptide source make this unsuitable as proof of general human gut benefits.
View source →Effects of hydrolyzed collagen alone or in combination with fish oil on the gut microbiome in patients with major burns
57 adults with 20-45% total body surface area burns
The study did not show clear between-group improvement in the measured gut bacteria overall. The collagen-plus-fish-oil arm prevented a drop in Bifidobacterium, and the collagen-alone arm lowered the Firmicutes/Bacteroidetes ratio versus baseline.
This is one of the few human collagen papers touching the gut category, but it is a special-population microbiome study rather than proof of general digestive or gut-lining benefits.
Limitations: Major-burn population, short duration, microbiome endpoints rather than consumer digestive symptoms, and no clear between-group clinical gut benefit.
View source →Effects of a Cod Protein Hydrolysate Supplement on Symptoms, Gut Integrity Markers and Fecal Fermentation in Patients with Irritable Bowel Syndrome
28 adults with irritable bowel syndrome
The supplement did not improve IBS symptom severity, gut-integrity markers, or fecal fermentation versus placebo.
This is not a collagen-peptide trial, but it is still useful adjacent evidence because it shows that gut claims do not automatically follow from marine protein-hydrolysate supplementation.
Limitations: Small trial, cod protein hydrolysate rather than collagen peptides, and therefore only an adjacent comparator for the gut category.
View source →Effect of a Daily Collagen Peptide Supplement on Digestive Symptoms in Healthy Women: 2-Phase Mixed Methods Study
40 healthy women (14 completers)
93% of completers experienced reduced digestive symptoms including bloating. Improvements in bowel frequency were observed. This is one of very few human studies directly testing collagen for digestive outcomes.
93% of completers experienced reduced digestive symptoms including bloating. Improvements in bowel frequency were observed. This is one of very few human studies directly testing collagen for digestive outcomes.
Limitations: Massive dropout (65% attrition), no placebo control, open-label design, limited to healthy women only. Essentially a pilot study.
View source →The Effects of Collagen Peptides on Exercise-Induced Gastrointestinal Stress: A Randomized, Controlled Trial
20 volunteers (16 male)
Collagen peptides did not modify exercise-induced changes in inflammation or subjective GI symptoms. However, LPS (a gut permeability marker) was higher in the placebo condition 2 hours post-exercise, suggesting a possible gut-barrier protective effect.
Collagen peptides did not modify exercise-induced changes in inflammation or subjective GI symptoms. However, LPS (a gut permeability marker) was higher in the placebo condition 2 hours post-exercise, suggesting a possible gut-barrier protective effect.
Limitations: Small sample, predominantly male, acute exercise stress rather than chronic digestive conditions. LPS difference was not the primary outcome.
View source →Anti-inflammatory Activity of Collagen Peptide In Vitro and Its Effect on Improving Ulcerative Colitis
Mice (n=10 per group) with DSS-induced colitis
Collagen peptides significantly reduced colonic tissue damage, increased tight junction protein expression (ZO-1, Occludin, Claudin-1), enhanced beneficial gut bacteria, and suppressed NF-kB/MAPK inflammatory signaling.
Collagen peptides significantly reduced colonic tissue damage, increased tight junction protein expression (ZO-1, Occludin, Claudin-1), enhanced beneficial gut bacteria, and suppressed NF-kB/MAPK inflammatory signaling.
Limitations: Exclusively animal and cell models. No human clinical validation. Small sample for microbiome analysis.
View source →Collagen Peptides and Saccharomyces boulardii CNCM I-745 Attenuate Acetic Acid-Induced Colitis in Rats by Modulating Inflammation and Barrier Permeability
36 male Sprague-Dawley rats
Both collagen peptides and S. boulardii significantly reduced disease activity index and damage scores. Collagen peptides significantly restored ZO-1 tight junction protein expression and reduced myeloperoxidase activity, indicating barrier integrity repair.
Both collagen peptides and S. boulardii significantly reduced disease activity index and damage scores. Collagen peptides significantly restored ZO-1 tight junction protein expression and reduced myeloperoxidase activity, indicating barrier integrity repair.
Limitations: No examination of microbiota composition or proinflammatory cytokine levels. Animal model only.
View source →Pet mobility and joint support
A randomized, double-blind, prospective, placebo-controlled study of the efficacy of a diet supplemented with curcuminoids extract, hydrolyzed collagen and green tea extract in owner's dogs with osteoarthritis
Dogs with osteoarthritis
The supplemented group showed improvements in owner- and veterinarian-rated osteoarthritis outcomes.
It is one of the more directly relevant hydrolyzed-collagen dog studies in the pet category.
Limitations: Multi-ingredient design makes it hard to isolate collagen's contribution.
View source →Effects of a feed supplement, containing undenatured type II collagen (UC II) and Boswellia Serrata, in the management of mild/moderate mobility disorders in dogs
Dogs with mild to moderate osteoarthritis or mobility problems
Owner-rated mobility improved and pain-threshold outcomes favored the supplemented period.
Shows there is newer dog-mobility evidence, but it often uses UC-II or multi-ingredient formulations instead of generic hydrolyzed collagen.
Limitations: Product-specific and not directly transferable to a hydrolyzed bovine peptide product.
View source →The oral intake of specific Bioactive Collagen Peptides improves gait and quality of life in canine osteoarthritis patients
31 dogs with naturally occurring OA (3 groups: BCP n=11, omega-3 n=11, placebo n=9)
Only the BCP group demonstrated significant improvement of kinetic parameters including peak vertical force (p<0.001). Quality of life (CBPI) improved significantly versus omega-3 (p=0.015). This is the first placebo-controlled canine RCT using objective force-plate gait analysis for collagen.
Only the BCP group demonstrated significant improvement of kinetic parameters including peak vertical force (p<0.001). Quality of life (CBPI) improved significantly versus omega-3 (p=0.015). This is the first placebo-controlled canine RCT using objective force-plate gait analysis for collagen.
Limitations: Small sample size (11 per arm). Single-centre study.
View source →Evaluation of the Effects of an Undenatured Collagen Type-2-Based Nutraceutical on Recovery Time after TPLO in Dogs
50 dogs with cranial cruciate ligament rupture undergoing TPLO surgery
The supplement group achieved normal gait patterns by week 12 while placebo required 24 weeks — effectively halving recovery time. Peak vertical force significantly higher at all follow-ups.
The supplement group achieved normal gait patterns by week 12 while placebo required 24 weeks — effectively halving recovery time. Peak vertical force significantly higher at all follow-ups.
Limitations: Owner questionnaires showed no subjective differences. No true placebo (open-label for control group).
View source →Collagen Hydrolysates as Nutritional Support in Canine Osteoarthritis: A Narrative Review
Review of existing literature on collagen hydrolysates in canine OA
Preliminary evidence supports clinical efficacy of collagen hydrolysates in dogs with OA, with reported reductions in lameness. Effects on biomarkers of cartilage metabolism and inflammation remain inconclusive. Identified lack of standardized dosing across studies.
Preliminary evidence supports clinical efficacy of collagen hydrolysates in dogs with OA, with reported reductions in lameness. Effects on biomarkers of cartilage metabolism and inflammation remain inconclusive. Identified lack of standardized dosing across studies.
Limitations: Narrative review (not systematic). Could not perform meta-analysis due to study heterogeneity.
View source →