The Peptide Cheat Sheet

A peptide is a short chain of amino acids that acts as a signaling molecule, telling cells to release growth hormone, reduce inflammation, or curb appetite. That definition covers insulin, which has saved lives since the 1920s, and compounds tested only in rats and sold online with a not for human consumption label. Lumping them together is how people get misled.

The Three Tiers That Matter

FDA approved drugscompleted full clinical trials and have at least one approved use. The GLP-1 drugs and tesamorelin live here. Prescription only.

Compounded, gray area peptidesare not approved but can, where rules allow, be prepared by licensed pharmacies under prescription. Most popular recovery and growth hormone peptides sit here, and the human evidence is thin.

Research chemicalshave no oversight, are sold labeled not for human consumption, and carry no guarantee of purity, dose, or contents.

The Rules Changed in 2026, and the Change Is Contested

In September 2023 the FDA moved roughly 19 peptides into Category 2, the tier for substances raising significant safety concerns, ending legal compounding of them. In February 2026 the HHS Secretary called those restrictions illegal on a podcast, said he had used peptides himself, and signaled they would reopen. That April the FDA removed 12 from Category 2. Removal authorized nothing: it moved them out of the banned tier without moving them into the permitted one.

On July 23 and 24, 2026, an advisory committee reviewed seven. FDA's own scientists had recommended against all seven, citing short, underpowered studies. The committee overrode them six consecutive times on narrow votes, backing BPC-157, KPV, TB-500, MOTS-c, Semax, and Epitalon, and rejecting only emideltide. The reconstituted panel drew conflict of interest scrutiny for including more members who prescribe, produce, or promote peptides.

Nothing is legal today. The votes are non binding, the HHS Secretary must sign off, and a rulemaking process taking most of a year has to finish. Five more, including GHK-Cu, Melanotan II, and PEG-MGF, come up by February 2027. Treat every status below as a snapshot to verify.

The Cheat Sheet

The tag after each name is what that peptide is prescribed or marketed for, not what it is proven to do. Watch the verb. Prescribed means a regulator approved it for that use. Marketed means somebody is selling it for that use.

GLP-1 and Metabolic Peptides (approved, well evidenced)

• Semaglutide(Ozempic, Wegovy) | prescribed for type 2 diabetes and weight loss. GLP-1 agonist. FDA approved, strong trial evidence.

• Tirzepatide(Mounjaro, Zepbound) | prescribed for type 2 diabetes and weight loss. Dual GIP/GLP-1 agonist, backed by large trials.

• Liraglutide(Saxenda, Victoza) | prescribed for type 2 diabetes and weight loss. Older GLP-1 agonist. FDA approved.

• Retatrutide| in trials for weight loss. Triple hormone agonist with dramatic late stage results. Investigational only.

• Tesamorelin(Egrifta) | prescribed for abdominal fat in HIV lipodystrophy. Approved for that use specifically.

• AOD-9604| marketed for fat loss. Growth hormone fragment. Not approved, limited human evidence.

• MOTS-c| marketed for metabolism and insulin sensitivity. Not approved. Recommended for the compounding list in July 2026 against FDA staff advice.

Growth Hormone Secretagogues (popular, mostly unapproved, sport banned)

• Sermorelin| marketed for recovery and body composition. Once approved as Geref, now discontinued and compounded only. WADA banned.

• CJC-1295| marketed for muscle growth and recovery. Raises GH and IGF-1. Not approved, gray market. WADA banned.

• Ipamorelin| marketed for recovery, sleep, and lean mass. Selective secretagogue. Not approved. WADA banned.

• GHRP-2 and GHRP-6| marketed for muscle growth and appetite. GHRP-6 strongly stimulates hunger. Neither was removed from Category 2 or reviewed in 2026, so their restricted status stands. WADA banned.

• Hexarelin| marketed for muscle growth. Potent secretagogue, research compound. WADA banned.

• MK-677 (Ibutamoren)| marketed for muscle growth, appetite, and sleep. Orally active, technically not a peptide. A terminated trial raised a heart failure signal. WADA banned.

• PEG-MGF| marketed for muscle repair. Research chemical with thin safety data. Up for review by February 2027. WADA banned.

Healing and Tissue Repair (huge hype, mostly animal data)

• BPC-157| marketed for injury and tendon recovery. The most hyped of the group, studied almost entirely in animals. The July 2026 panel backed it 8 to 6 for ulcerative colitis, not injury, after FDA reviewers found the evidence lacking. Not approved, not legal to compound, widely sold as a research chemical.

• TB-500 (Thymosin Beta-4)| marketed for muscle and tissue repair. Not approved. Recommended in July 2026 on the same narrow margin. WADA banned.

• Thymosin Alpha-1| used clinically for immune support. Prescribed in some countries for infections and cancer care, with better evidence than most here. Not FDA approved. Compounded.

• GHK-Cu (copper peptide)| used topically for skin and wound healing. Common and low risk in skincare. The injectable form is unapproved and up for review by February 2027.

• KPV| marketed for gut and skin inflammation. Recommended in July 2026 for wounds and inflammatory conditions, over FDA staff objection.

Cognitive, Mood, and Sleep

• Selank| marketed for anxiety and focus. Used medically in Russia, limited Western evidence. Compounded or research.

• Semax| marketed for focus and brain protection. ACTH derived, also Russian clinical use. Recommended for the compounding list in July 2026.

• DSIP (Delta Sleep-Inducing Peptide)| marketed for sleep. Also called emideltide. Limited, mixed evidence. The only one of the seven the July 2026 panel rejected, 7 to 6.

• Epitalon| marketed for anti aging and longevity. Studied largely by a single research group, with very little independent human data. Recommended in July 2026.

Skin, Cosmetic, and Sexual Health

• Collagen peptides| taken for skin, joint, and hair support. The one you can buy anywhere. A food supplement with modest but real evidence for skin elasticity, and completely different from everything above.

• Melanotan II| marketed for tanning and libido. Real safety concerns including mole changes and cardiovascular effects. Not approved, up for review by February 2027.

• PT-141 (Bremelanotide)| prescribed as Vyleesi for low sexual desire in women. Sold as PT-141 for general libido use, which is neither the approved product nor the approved indication.

• Kisspeptin| studied for fertility and sexual function. Research or early clinical stage.

How to Read This Responsibly

Marketed for does not mean proven or safe. Not FDA approved means no guaranteed purity or dose, and a research chemical vial can contain contaminants or the wrong compound entirely.

An advisory recommendation is not an approval, and not even a finding that something works. In July 2026 a committee backed six peptides the agency's own reviewers had judged insufficiently supported. Both things are true at once, and anyone selling you the first half without the second is selling.

Legality and sport legality are different, and many of these will cost a tested athlete their eligibility. Almost every search result in this category belongs to someone with a vial to sell or a referral fee to earn.

The Bottom Line

A few of these, the GLP-1 drugs and tesamorelin above all, are genuine FDA approved breakthroughs. Most of the rest are unapproved, thinly studied in humans, sold through an unregulated gray market, and banned in sport.

The 2026 thaw is real, and it is worth seeing for what it is: a political and procedural shift that loosened restrictions without generating new evidence that these compounds work. Access is moving faster than the science.

This is a map of what these compounds are, not a menu to order from. If you are seriously considering any of them, that is a conversation for a licensed medical provider, not a chart or a podcast host.

This article is educational and is not medical advice, nor an endorsement or recommendation of any peptide. Most peptides discussed here are not FDA approved for the uses described, may be illegal to obtain or use in certain contexts, and can carry serious health risks. Many are prohibited in competitive sport. Never start, stop, or source any peptide, drug, or supplement without consulting a qualified, licensed healthcare professional.

This story was originally published by Men's Fitness on Aug 11, 2026, where it first appeared in the Nutrition section. Add Men's Fitness as a Preferred Source by clicking here.