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UU library
Every peptide, mapped to the body.
160 compounds, from approved medicines to early research molecules. Each one filed by the system research looks at, with its regulatory status and the strength of the evidence behind it.
- Compounds
- 160
- Research summaries
- 39
- At UU
- 56
- Approved medicine71
Approved as a medicine by the FDA or the EMA for at least one indication. Approval covers the named indication and formulation only.
- In clinical trials19
In human clinical trials and not yet approved by the FDA or the EMA. Results to date are from trial populations under medical supervision.
- Research compound53
Not approved as a medicine by the FDA or the EMA. Some are registered in individual countries. Supplied for laboratory research only.
- Cosmetic ingredient17
Used as a topical cosmetic ingredient. Cosmetic use is not a medicinal approval, and most evidence comes from manufacturer and small panel studies.
Reviewed October 2026
In the UU catalog
Researched, batch-tested, ready to ship.
Compounds UU carries that have a full research summary in the library.
25 compounds · Skin & hair
Skin & hair25
Copper peptides, melanocortins and the signal peptides used in skin research and cosmetics.
- ApprovedAt UU
Afamelanotide
Melanotan I · Scenesse
Melanocortin agonist
A stabilised analogue of alpha-MSH. Approved as an implant for erythropoietic protoporphyria, a rare light-sensitivity disorder.
Human trialsShop - ResearchAt UU
Glutathione
L-glutathione · GSH
Antioxidant tripeptide
The main antioxidant tripeptide inside human cells. Studied in redox biology, liver research and skin pigmentation.
Early human dataShop - Cosmetic
Acetyl tetrapeptide-5
Eyeseryl
Cosmetic peptide
A tetrapeptide used in eye-area formulas. Studied in small panels for puffiness and skin elasticity.
Summary pending - Cosmetic
Argireline
Acetyl hexapeptide-8
SNARE-mimicking peptide
A hexapeptide modelled on part of the SNAP-25 protein. One of the most widely used cosmetic peptides for expression lines.
Summary pending - Approved
Bacitracin
Polypeptide antibiotic
A polypeptide antibiotic best known in topical ointments for minor skin wounds.
Summary pending - Cosmetic
Carnosine
Beta-alanyl-L-histidine
Dipeptide
A dipeptide concentrated in muscle and brain. Used in skincare and supplements, and studied for glycation and muscle buffering.
Summary pending - In trials
Dersimelagon
MT-7117
Oral MC1R agonist
An oral small-molecule MC1 receptor agonist. In clinical trials for erythropoietic protoporphyria.
Summary pending - Approved
Difelikefalin
Korsuva · Kapruvia
Peripheral kappa-opioid agonist
A peptide that acts on kappa-opioid receptors outside the brain. Approved for itch linked to chronic kidney disease on haemodialysis.
Summary pending - Cosmetic
Hexapeptide-9
Collagen-derived peptide
A peptide modelled on repeating sequences of collagen. Used in barrier and firmness formulas.
Summary pending - Cosmetic
Leuphasyl
Pentapeptide-18
Enkephalin-mimicking peptide
A pentapeptide studied in cosmetic panels alongside Argireline for expression lines.
Summary pending - Cosmetic
Matrixyl
Palmitoyl pentapeptide-4
Signal peptide
A lipid-linked fragment of type I procollagen. Studied in small cosmetic trials for fine lines and skin texture.
Summary pending - Research
Melanotan II
MT-II
Melanocortin agonist
A cyclic, non-selective melanocortin agonist never approved as a medicine. Studied for pigmentation, and the parent compound of bremelanotide.
Summary pending - Cosmetic
Nonapeptide-1
Melanostatine
MC1R antagonist
A nine-residue peptide that competes with alpha-MSH at the MC1 receptor. Used in cosmetic formulas for uneven pigmentation.
Summary pending - Cosmetic
Oligopeptide-1
sh-Oligopeptide-1 · EGF
Epidermal growth factor
A recombinant form of human epidermal growth factor. Used in cosmetic serums and studied in wound-healing research.
Summary pending - Cosmetic
Palmitoyl hexapeptide-12
Elastin-derived peptide
A lipid-linked repeat of an elastin sequence. Used in firmness formulas.
Summary pending - Cosmetic
Palmitoyl tetrapeptide-7
Signal peptide
A lipid-linked tetrapeptide studied in vitro for interleukin-6 signalling in skin cells. A common partner of palmitoyl tripeptide-1.
Summary pending - Cosmetic
Palmitoyl tripeptide-1
Pal-GHK
Signal peptide
A lipid-linked form of the GHK sequence. Used in collagen-focused cosmetic formulas, often paired with palmitoyl tetrapeptide-7.
Summary pending - Cosmetic
Palmitoyl tripeptide-38
Matrixyl synthe'6
Signal peptide
A lipid-linked tripeptide studied in manufacturer panels for extracellular matrix proteins and wrinkle depth.
Summary pending - Cosmetic
SYN-AKE
Dipeptide diaminobutyroyl benzylamide diacetate
Acetylcholine receptor antagonist
A small synthetic peptide modelled on a component of temple viper venom. Used in cosmetics for expression lines.
Summary pending - In trials
Thymosin beta-4
RGN-259
Actin-sequestering peptide
The full 43-residue protein that TB-500 is based on. Studied in clinical trials for dry eye and slow-healing wounds.
Summary pending - Cosmetic
Tripeptide-10 citrulline
Decorinyl
Decorin-mimicking peptide
A tetrapeptide designed to mimic part of decorin. Studied for collagen fibril organisation in skin.
Summary pending
The UU library is an educational reference. It is not medical advice, does not make a health claim, and does not tell anyone how to use a compound. UU products are sold for laboratory research use only and are not for human consumption. Regulatory status changes: confirm it with the relevant authority before relying on it.