Peptides by goal: what works for what
Most people arrive knowing what they want, not which molecule to ask for. These pages start from the goal and work back to the compounds — and each one opens by stating what the evidence actually supports, including the goals where the honest answer is “less than you have been told”.
Peptides for muscle growth
Which peptides are marketed for building muscle, what human evidence exists for each, and why growth hormone secretagogues increase lean mass on a scale without reliably increasing strength.
Read the evidencePeptides for anti-aging
Epitalon, NAD+, SS-31, GHK-Cu and MOTS-c are all sold for longevity. What has been shown in humans, what has only been shown in cells and mice, and what has been shown in neither.
Read the evidencePeptides for weight loss
GLP-1 and dual agonist medications produce 15 to 22 percent weight loss in trials and are FDA-approved. Which are approved, which are investigational, and which marketed fat-loss peptides failed their trials.
Read the evidencePeptides for injury & recovery
BPC-157 and TB-500 are the most searched healing peptides. The rodent data is genuinely striking and the human data is almost entirely absent. What that gap means before you spend money.
Read the evidencePeptides for sexual function
PT-141 (bremelanotide) is FDA-approved for hypoactive sexual desire disorder in premenopausal women. What it does, who it was approved for, and how it differs from ED medications.
Read the evidencePeptides for immune support
Thymosin alpha-1 is approved in many countries but not the United States. What the immune peptides do, where they are approved, and what the evidence supports.
Read the evidencePeptides for growth hormone
How growth hormone secretagogues differ from injecting HGH, which are FDA-approved and for what, and what raising your growth hormone actually achieves.
Read the evidencePeptides for skin & hair
GHK-Cu has the strongest human evidence of any cosmetic peptide. What topical versus injected use means, and what the collagen data actually shows.
Read the evidencePeptides for energy & mitochondria
NAD+, MOTS-c and SS-31 all target mitochondrial function. What raising NAD+ has been shown to do, and what it has not.
Read the evidencePeptides for gut health
BPC-157 and KPV are used for intestinal inflammation and leaky gut. The rodent evidence for gut healing, and why the human gap matters more here.
Read the evidencePeptides for cognition & mood
Semax and Selank are registered medicines in Russia and unapproved elsewhere. Dihexa's core mechanism paper was retracted in 2025. What that means for readers.
Read the evidencePeptides for sleep
Delta sleep-inducing peptide is the main compound sold for sleep. The evidence is small, dated and largely unreplicated, and it is not FDA-approved.
Read the evidencePeptides for hormones & menopause
Where peptides fit alongside testosterone replacement and menopausal hormone therapy — and where they do not substitute for either.
Read the evidenceMedical Disclaimer: This content is for informational purposes only and should not be considered medical advice. Always consult with a qualified healthcare provider before beginning any peptide therapy treatment.