Peptide research, one at a time.
Pick a compound to read its research summary, key numbers and community experience.
Retatrutide
A triple-hormone peptide (GIP, GLP-1 and glucagon receptors) studied for weight and metabolic health in large human trials.
Randomised trial Tissue repair & recoveryPopularBPC-157
A 15-amino-acid peptide derived from a stomach protein, studied for tendon, muscle and gut healing, almost entirely in animals.
Cell study Tissue repair & recoveryPopularGHK-Cu
A copper-binding tripeptide found in human plasma, studied for collagen, skin and wound repair in lab, animal and cosmetic studies.
Animal study Metabolism & body compositionTesamorelin
A growth hormone-releasing hormone (GHRH) analogue studied for visceral belly fat, liver fat and cognition in human trials.
Randomised trial Metabolism & body compositionMOTS-c
A small peptide encoded in mitochondrial DNA, studied for metabolism, insulin sensitivity and physical capacity, so far mainly in mice.
Animal study Tissue repair & recoveryTB-500
A synthetic fragment of thymosin beta-4 studied for cell migration and wound repair; most research uses the full protein in animals.
Animal study Tissue repair & recoveryKPV
A three-amino-acid peptide (Lys-Pro-Val) studied for gut inflammation, so far only in mouse colitis models and cell studies.
Animal study Skin & collagenGlutathione
The body's main antioxidant, a three-amino-acid peptide studied for oxidative stress, body glutathione levels and skin tone.
Randomised trial Mitochondria & cellular energySS-31
A mitochondria-targeting peptide (elamipretide) studied for cellular energy in ageing mice and in human trials for mitochondrial disease.
Randomised trial Mitochondria & cellular energyNAD+
A coenzyme central to cellular energy and DNA repair whose levels fall with age; most human research uses oral precursors.
Human study Brain & cognitionSemax
A synthetic analogue of an ACTH fragment, studied mainly in Russia for brain growth factor (BDNF), cognition and stroke recovery.
Human study Brain & cognitionSelank
A synthetic analogue of the immune peptide tuftsin, studied mainly in Russia for anxiety, memory and brain BDNF.
Human study Growth hormone signallingIpamorelin
A five-amino-acid growth hormone secretagogue studied for selective GH release, mostly in animals and early human pharmacology studies.
Human study Growth hormone signallingHGH
Human growth hormone, studied in healthy older adults for body composition; a major review found small gains and more side effects.
Human study Growth hormone signallingIGF-1 LR3
A modified, longer-acting form of IGF-1 used mainly as a lab reagent; studied in animals and cells, with little or no human data.
Animal study BlendKLOW
A blend of 4 peptides. The research is on each component, not on the blend.
BlendGlow Stack
A blend of 3 peptides. The research is on each component, not on the blend.
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How to read the evidence labels
- Randomised trial
People are randomly assigned to a test or comparison group. The strongest evidence.
- Human study
Done in people, without a randomised comparison.
- Review
Sums up many published studies.
- Animal study
Done in animals. Results may differ in people.
- Cell study
Done on cells in a lab. The earliest stage.
How strong is the evidence for each compound?
Human trials are the strongest evidence, then animal studies, then cell studies. Blends are rated by their components.
| Compound | Research area | Evidence | Studies |
|---|---|---|---|
| Retatrutide | Metabolism & body composition | Randomised trial | 2 |
| BPC-157 | Tissue repair & recovery | Cell study | 2 |
| GHK-Cu | Tissue repair & recovery, Skin & collagen | Animal study | 3 |
| Tesamorelin | Metabolism & body composition, Brain & cognition | Randomised trial | 3 |
| MOTS-c | Metabolism & body composition, Mitochondria & cellular energy | Animal study | 2 |
| TB-500 | Tissue repair & recovery, Skin & collagen | Animal study | 3 |
| KPV | Tissue repair & recovery | Animal study | 2 |
| Glutathione | Skin & collagen, Mitochondria & cellular energy | Randomised trial | 2 |
| SS-31 | Mitochondria & cellular energy | Randomised trial | 3 |
| NAD+ | Mitochondria & cellular energy | Human study | 2 |
| Semax | Brain & cognition | Human study | 2 |
| Selank | Brain & cognition | Human study | 2 |
| Ipamorelin | Growth hormone signalling | Human study | 2 |
| HGH | Growth hormone signalling | Human study | 2 |
| IGF-1 LR3 | Growth hormone signalling | Animal study | 2 |
| KLOW | Tissue repair & recovery, Skin & collagen | See components | GHK-Cu, BPC-157, TB-500, KPV |
| Glow Stack | Skin & collagen | See components | GHK-Cu, BPC-157, TB-500 |
Updated 2 October 2026
Studies checked on PubMed on 2 October 2026.
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