
Acetyl tetrapeptide-3 is a biomimetic peptide made up of four amino acids. It stimulates collagen and laminin production and supports hair-follicle anchoring & follicular matrix. It is widely used to protect hair from thinning and androgenetic alopecia by inhibiting 5-α-reductase activity (the enzyme converting testosterone to DHT).
It is synthesised by the acetylation of Tetrapeptide-3 through solid-phase peptide synthesis (SPPS) technology, and it is widely added in hair serums, masks, thickening shampoos and conditioners.

CAS No.:827306-88-7
Synonyms: Acetyl tetrapeptide-3, Folixyl, Kollaren 6, Uxi hair growth peptide, Ac-lys-gly-his-lys-NH2
| Physical Properties | |
| Chemical formula | C22H39N9O5 |
| IUPAC name | (2S)-2-[[(2S)-2-[[2-[[(2S)-2-acetamido-6-aminohexanoyl]amino]acetyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]-6-aminohexanamide |
| Molecular weight | 509.6 g/mol |
| Solubility | Soluble in water and organic solvents such as ethanol, DMSO, and Dimethyl formamide (DMF) |
| Color | White |
| State | Powder |
| Pictograms : | ![]() |
| Hazard Statements : | H302 Harmful if swallowed H315: Causes skin irritation H319: Causes serious eye irritation H335: May cause respiratory irritation |
| Precautionary statements : | P261: Do not breathe dust/ fume/ gas/ mist/ vapors/ spray P264: Wash skin thoroughly after handling P280: Wear protective gloves/ eye protection/ face protection P301 + P312: IF SWALLOWED: P312: Call a POISON CENTER or doctor/physician if you feel unwell P302 + P352: IF ON SKIN: Wash with plenty of soap and water. P304 + P340: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing P330: Rinse Mouth P332 + P313: If skin irritation or rash occurs: Get medical advice/ attention P337 + P313: If eye irritation persists, get medical advice/attention P62 + P364: Take off contaminated clothing and wash it before reuse |
Acetyl tetrapeptide-3 is a biomimetic peptide made up of four amino acids. It stimulates collagen and laminin production and supports hair-follicle anchoring & follicular matrix. It is widely used to protect hair from thinning and androgenetic alopecia by inhibiting 5-α-reductase activity (the enzyme converting testosterone to DHT).
It is synthesised by the acetylation of Tetrapeptide-3 through solid-phase peptide synthesis (SPPS) technology, and it is widely added in hair serums, masks, thickening shampoos and conditioners.

CAS No.:827306-88-7
Synonyms: Acetyl tetrapeptide-3, Folixyl, Kollaren 6, Uxi hair growth peptide, Ac-lys-gly-his-lys-NH2
| Physical Properties | |
| Chemical formula | C22H39N9O5 |
| IUPAC name | (2S)-2-[[(2S)-2-[[2-[[(2S)-2-acetamido-6-aminohexanoyl]amino]acetyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]-6-aminohexanamide |
| Molecular weight | 509.6 g/mol |
| Solubility | Soluble in water and organic solvents such as ethanol, DMSO, and Dimethyl formamide (DMF) |
| Color | White |
| State | Powder |
| Pictograms : | ![]() |
| Hazard Statements : | H302 Harmful if swallowed H315: Causes skin irritation H319: Causes serious eye irritation H335: May cause respiratory irritation |
| Precautionary statements : | P261: Do not breathe dust/ fume/ gas/ mist/ vapors/ spray P264: Wash skin thoroughly after handling P280: Wear protective gloves/ eye protection/ face protection P301 + P312: IF SWALLOWED: P312: Call a POISON CENTER or doctor/physician if you feel unwell P302 + P352: IF ON SKIN: Wash with plenty of soap and water. P304 + P340: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing P330: Rinse Mouth P332 + P313: If skin irritation or rash occurs: Get medical advice/ attention P337 + P313: If eye irritation persists, get medical advice/attention P62 + P364: Take off contaminated clothing and wash it before reuse |
Acetyl tetrapeptide-3 is added to hair care formulations to promote hair densification and the synthesis of extracellular matrix proteins around the follicles, and supports in hair fibres anchoring with the scalp.
Acetyl Tetrapeptide-3 stimulates collagen synthesis and helps slow down the skin’s ageing process, and it is widely used in mascaras, cleansers, and hair serums.
Acetyl Tetrapeptide-3 acts as a DHT blocker, and it inhibits 5-alpha reductase, which converts testosterone into dihydrotestosterone (DHT), and helps in androgenetic alopecia (AGA) and reduces hair density.
Acetyl tertapeptide-3 does not have any known side effects. However, it is advisable to perform a patch test and tolerance test before using it.
Acetyl Tetrapeptide-3 is a biomimetic peptide and is generally considered safe for topical use. It is added to hair care formulations to strengthen the extracellular matrix (ECM) and enhance hair density.
Acetyl Tetrapeptide-3 biomimetic peptide, and Trifolium pratense Clover Flower Extract are active ingredients added to hair care products to support hair strength, density, and scalp health.