Peptides for muscle & strength

Muscle claims cover a wide range, from collagen powder to injectable growth-hormone-releasing compounds. The studies in this hub only support a narrow claim for one of them.

What the evidence shows

Oral collagen peptides with resistance training

Limited human evidence

One randomised trial in older men with sarcopenia found larger gains in fat-free mass and strength than placebo when both groups trained. It does not show an effect without exercise, or in other groups.

Injectable and research peptides (BPC-157, CJC-1295, ipamorelin and others)

Mostly animal evidence

Two recent reviews conclude the claimed muscle and recovery benefits are not substantiated by human trials. Most evidence is from animals.

Verdicts reflect only the studies summarised on this site, last reviewed November 9, 2026. See how verdicts are set.

Studies (3)

Study	Design	Peptide
Tewari et al., 2026	Review	BPC-157, TB-500 / thymosin beta-4, CJC-1295, Ipamorelin, MK-677 (ibutamoren), GHK-Cu (copper peptide)
Mendias et al., 2026	Review	BPC-157, TB-500 / thymosin beta-4, CJC-1295, Ipamorelin, GHK-Cu (copper peptide), Sermorelin, Tesamorelin, MOTS-c
Zdzieblik et al., 2015	Human trial (controlled)	Collagen peptides

ReviewJoints & tendons Muscle & strength Safety & regulationBPC-157TB-500 / thymosin beta-4CJC-1295IpamorelinMK-677 (ibutamoren)GHK-Cu (copper peptide)

Peptide Supplements and Their Therapeutic Applications in Sports Medicine

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…

What it found and what it doesn't show

ReviewSafety & regulation Joints & tendons Muscle & strengthBPC-157TB-500 / thymosin beta-4CJC-1295IpamorelinGHK-Cu (copper peptide)SermorelinTesamorelinMOTS-c

Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance

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…

What it found and what it doesn't show

Human trial (controlled)Muscle & strengthCollagen peptidesOral

Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomised controlled trial

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).

What it found and what it doesn't show

Not covered yet

Controlled trials of collagen peptides outside older, sarcopenic men are not summarised here yet.
Studies of oral marine peptides for muscle are not summarised here yet.

Educational information only. It is not medical or legal advice, and nothing here is a recommendation to use any peptide. Talk to a clinician before starting a supplement or treatment.