Tewari et al., 2026 · Am J Sports Med · Published animal and human studies of six peptides for musculoskeletal recovery
Of the publications found, 67% used animal models. Human studies were a handful, mostly without robust controls, and showed modest improvements at best for metabolic bone health and degenerative knee pain. The authors conclude that the claimed benefits for…
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Mendias et al., 2026 · Sports Med · Narrative review of approved and unapproved peptides marketed directly to patients
Reviews the mechanisms, safety and regulatory status of peptides sold for injury recovery and performance, including BPC-157, CJC-1295, GHK-Cu, ipamorelin, MOTS-c, sermorelin, tesamorelin and TB-500. Many unapproved peptides show favourable tissue-repair or…
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Vasireddi et al., 2025 · HSS J · 36 studies: 35 preclinical (animal) and 1 clinical, from 1993 to June 2024
Nearly all the evidence on BPC-157 is from animals. Those studies suggest faster healing of muscle, tendon, ligament and bone injuries. The one clinical report was a retrospective study of knee injections in which 7 of 12 patients reported relief lasting…
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McGuire et al., 2025 · Curr Rev Musculoskelet Med · Preclinical and clinical literature on BPC-157 in musculoskeletal healing
BPC-157 shows broad regenerative effects in animal models, acting on blood-vessel growth, fibroblast activity and inflammation signalling. Only three small human pilot studies exist (knee pain, interstitial cystitis, and intravenous safety), with no adverse…
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Lee et al., 2025 · Altern Ther Health Med · 2 adults (a 58-year-old man and a 68-year-old woman) at a private clinic in Florida, both of whom had received intravenous BPC-157 before
Blood tests of heart, liver, kidney, thyroid and blood-glucose markers showed no measurable change after the infusions, and no side effects were reported.
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Pu et al., 2023 · Nutrients · 26 randomised controlled trials; 1,721 participants
Hydrolysed collagen improved skin hydration and elasticity compared with placebo (both p < 0.00001). The size of the hydration effect varied with the source of the collagen and how long it was taken; elasticity did not differ by source.
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de Miranda et al., 2021 · Int J Dermatol · 19 randomised, double-blind, controlled trials; 1,125 participants aged 20–70 (95% women)
Pooled results favoured hydrolysed collagen over placebo for skin hydration, elasticity and wrinkles. The authors conclude that taking it for about 90 days is effective at reducing signs of skin aging.
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Human study (no control group)Joints & tendonsBPC-157TB-500 / thymosin beta-4Injectable Lee et al., 2021 · Altern Ther Health Med · 17 patients with knee pain at one Florida clinic; 16 reached by phone
Of 16 patients contacted, 14 (87.5%) said their knee pain eased after an injection into the knee of BPC-157 alone (12 patients) or BPC-157 with thymosin beta-4 (4 patients).
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García-Coronado et al., 2019 · Int Orthop · Randomised placebo-controlled trials of oral collagen in osteoarthritis (number of trials not given in the abstract)
Collagen lowered the total WOMAC osteoarthritis score (weighted mean difference −8.00; 95% CI −13.04 to −2.95) and the pain visual analogue scale (−16.57; 95% CI −26.24 to −6.89) compared with placebo. Within WOMAC, the stiffness subscore improved.
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Zdzieblik et al., 2015 · Br J Nutr · 53 men, average age 72, with sarcopenia (age-related muscle loss)
Everyone gained muscle and strength from the training. The collagen group gained more: fat-free mass rose 4.2 kg versus 2.9 kg on placebo, quadriceps strength rose 16.5 Nm versus 7.3 Nm, and fat mass fell 5.4 kg versus 3.5 kg (all P < 0.05).
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Asserin et al., 2015 · J Cosmet Dermatol · Two placebo-controlled trials plus a lab experiment on human skin samples
Daily oral collagen peptides raised skin hydration after 8 weeks. Collagen density in the dermis rose and fragmentation of the collagen network fell from week 4, and both effects were still present at 12 weeks. In skin samples in the lab, collagen peptides…
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Pickart et al., 2015 · Biomed Res Int · Review of research on GHK, a peptide found in human plasma that declines with age
Describes GHK, bound to copper, as supporting wound healing and skin repair, mainly from animal and cell work, and reports that cosmetic products containing it were found to improve skin firmness, elasticity and fine lines. It also reports that GHK can raise…
What it found and what it doesn't show