Doctor Explains 20 Most Powerful Peptides

“Peptides” as an umbrella term can be a little unhelpful without specifying what kind(s), much like saying “drugs” is rarely useful without specifying what kind(s).

Dr. Amy Froese explains 20 important ones:

Peptide power

Fun fact: the human brain is usually only capable of holding 7±2 pieces of information at a time; when it appears to be holding more pieces than that at once, then this is the brain doing what psychologists refer to by very technical name of “chunking”.

This is how, for example, a chess player may glance at a position and memorize it in a few seconds:

• while a non-player would see 64 squares to memorize each with 13 possibilities (which already sounds like a lot, but since it factors exponentially for each square, we end up with more than eight quattuordecillion positions, which is a mind-bogglingly large number indeed, and means that just for a single position, there are more than twice as many pieces of information to memorize as there are stars in the universe).
• the chess-player sees just an easily graspable handful of familiar patterns, e.g: “KIA against something like a Tarrasch defense setup with just a couple of deviations from a well-explored tabiya that I know”. That’s maybe 5 chunks of information, certainly not more than 9, and thus easy to remember.

In short: we can remember more things when we chunk many things together into fewer things.

Because of these considerations, rather than bombard you with a list of 20 peptides for you to forget instantly, we’ll chunk them into 7±1 easily memorable categories for you:

1. Fat-loss peptides: semaglutide, tirzepatide, and retatrutide suppress appetite, improve insulin sensitivity, and drive significant weight loss; semaglutide is FDA-approved but often causes nausea and constipation, tirzepatide offers greater loss with fewer side effects but is more expensive, and retatrutide is a triple-agonist showing very high loss in studies but is not yet prescribable at time of writing (it’s 2025 now, which already sounds like a sci-fi year, yet here we are without flying cars or doors that go swish, so if you’re reading this in the future, we hope it’s nice there!). AOD-9604 is a HGH fragment with mixed evidence for fat loss, and tesamorelin is FDA-approved for HIV-associated lipodystrophy and effectively reduces visceral fat.
2. Repair and recovery: BPC-157 is widely used for joint, tendon, and gut repair with strongly mixed user reports, and TB-500 is a systemic tissue-healing partner often combined with BPC-157.
3. Immune-modulating peptides: KPV can support melanin production, reduce inflammation, improve immune function, offer neuroprotection, and help with intestinal inflammatory diseases, while thymosin-alpha-1 has been studied for enhancing immune response but often produces only subtle effects at best.
4. Growth-hormone and IGF-1 enhancers: CJC-1295 and ipamorelin work synergistically to raise GH and IGF-1 for strength, muscle gain, endurance, and recovery; MOTS-C increases mitochondrial production and may improve energy, endurance, and longevity; IGF-1 LR3 is potent for muscle growth but carries substantial risks.
5. Sleep and longevity aids: epitalon may lengthen telomeres and increase melatonin production, sometimes improving sleep and/but sometimes paradoxically causing overstimulation.
6. Nootropics and mood modulators: selank is an anti-anxiety peptide with effects comparable to benzodiazepines for some people but with highly variable responses; semax provides stimulant-like focus but wears off quickly and may cause a loss-of-energy crash later.
7. Skin and aesthetic peptides: GHK-copper improves skin and hair when used topically, but injected forms appear less effective; melanotan-II darkens the skin but may cause new or changing moles and is generally considered a terrible idea. Please don’t do that one.
8. Fertility and hormone-support peptides: PT-141 works centrally to increase libido but can cause nausea and unusual genital sensation; the delightfully-named kisspeptin-10 stimulates GnRH, increasing LH and FSH to support testosterone production, ovulation, sperm production, and fertility (not usually all in the same person; its gonadotropin action means that it’ll stimulate whatever you’ve got to work with anatomically, e.g. testes/ovaries etc, and because of how these analogous organs are developed in utero, it’s nigh-impossible for even intersex people to be born with both), and is being researched for IVF applications.

For more on all of these, enjoy:

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Take care!