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Some interrupt nerve to muscle signalling, some feed collagen production, some act on pigment. Knowing the group tells you more than any product description.
Cosmetic Peptides: Three Groups, Three Mechanisms
Cosmetic peptides fall into three groups that work on completely different principles. Some interrupt nerve to muscle signalling. Some feed the machinery that builds structural protein. Some act on pigment. Knowing which group a compound belongs to tells you more than any product description will.
Group one: signal blockers
Expression lines come from muscle movement. Repeated contraction of the small muscles of the face folds the skin over them, and over time those folds become permanent.
To make a muscle contract, a nerve releases neurotransmitter into the gap between them. That release depends on a group of proteins called the SNARE complex, which pulls the vesicle containing the neurotransmitter up against the cell membrane so it can fuse and release its contents. No SNARE assembly, no release, no contraction.
Snap-8
Snap-8 is acetyl octapeptide-3, an eight amino acid peptide. Its sequence is modelled on the end of SNAP-25, one of the proteins in the SNARE complex.
The idea is competition. By resembling part of SNAP-25, it competes for a position in the complex, and a complex assembled with an imposter in it works less efficiently. Less efficient assembly means less neurotransmitter released and weaker contraction.
It is the successor to Argireline, acetyl hexapeptide-8, which works the same way with a shorter sequence. Snap-8 is the extended version.
Worth being precise about the comparison to botulinum toxin, since these are constantly described as alternatives to it. They target the same system from different angles. Botulinum toxin is an enzyme that cleaves SNARE proteins outright, which is why its effect is profound and lasts months. A competing peptide interferes with assembly rather than destroying the components. Same pathway, very different magnitude.
Snap-8 and botulinum toxin are both stocked.
Group two: matrix builders
The other reason skin changes with age has nothing to do with muscle. It is the structural protein underneath.
The dermis is built from collagen and elastin, produced by fibroblasts. Production declines with age while breakdown continues, and the result is loss of firmness and elasticity.
GHK-Cu
The most researched compound in this group. GHK is three amino acids bound to a copper ion, and it occurs naturally in plasma at levels that decline with age.
The copper is the functional part. It is the cofactor for lysyl oxidase, the enzyme that cross links collagen and elastin fibres, and cross linking is what converts loose protein strands into tissue with real structural strength. It is also the cofactor for the copper zinc form of superoxide dismutase.
Covered in full in the GHK-Cu article. The close relative AHK-Cu swaps glycine for alanine and appears mainly in hair research.
Two things separate this group from the first. Signal blockers act on movement and their effect stops when they do. Matrix builders act on the tissue itself, which is slower and structural rather than functional.
Group three: pigment
The third group acts on melanin, and it runs through the melanocortin system.
MT-1
MT-1 is an analog of alpha-MSH, melanocyte stimulating hormone. It acts on MC1R, the melanocortin receptor found on melanocytes, and activating it drives melanin production.
This is where the peptide families on this site connect in a way worth noticing. Alpha-MSH has produced three separate compounds pulling in three directions:
- MT-1 keeps the pigmentation activity through MC1R.
- PT-141 keeps the central arousal activity through MC4R in the brain.
- KPV is the three residue tail carrying the anti-inflammatory activity, and it leaves pigmentation behind entirely.
One parent hormone, five receptors, three fragments developed for three different purposes. MT-1 is stocked in 10 mg vials.
The other direction
Pigment research runs both ways. Glutathione inhibits tyrosinase, the rate limiting enzyme in melanin synthesis, and shifts production toward the lighter form of melanin. Same system, opposite end.
The three groups side by side
| Group | Target | Examples |
|---|---|---|
| Signal blockers | SNARE complex, nerve to muscle | Snap-8, Argireline, botulinum toxin |
| Matrix builders | Collagen and elastin, fibroblasts | GHK-Cu, AHK-Cu |
| Pigment | Melanocortin receptors, tyrosinase | MT-1, glutathione |
They do not overlap, which is why they are found combined in blends rather than chosen between. Worth noting that not everything filed under aesthetics is a peptide at all: Lemon Bottle is a vitamin, a phospholipid and an enzyme. The hair, skin and nail blend and the Super Human blend both work on that principle.
Common questions
What is the SNARE complex?
A group of proteins that pull a neurotransmitter containing vesicle against the cell membrane so it can fuse and release its contents. It is a required step in a nerve telling a muscle to contract.
How is Snap-8 different from Argireline?
Same mechanism, different length. Argireline is acetyl hexapeptide-8, six residues. Snap-8 is acetyl octapeptide-3, eight residues, developed as the extended version.
Why is copper in a skin peptide?
Because lysyl oxidase, the enzyme that cross links collagen and elastin, is copper dependent and does not function without it. The peptide delivers copper in a bound, controlled form.
Are MT-1 and PT-141 related?
Yes. Both come from the alpha-MSH family. MT-1 acts on MC1R and pigmentation, PT-141 on MC4R in the brain and arousal. Different receptors in the same family.
TL;DR
Cosmetic peptides split into three groups. Signal blockers like Snap-8 interfere with SNARE complex assembly to reduce muscle contraction, the same system botulinum toxin acts on but by competition rather than by cleaving it. Matrix builders like GHK-Cu supply copper for lysyl oxidase, the enzyme that cross links collagen and elastin. Pigment compounds run through the melanocortin system, with MT-1 driving melanin production through MC1R and glutathione working the opposite way by inhibiting tyrosinase.
Everything we supply is lab tested for purity and identity, and sold as research grade material for laboratory and research use. See the cosmetic and aesthetic range.
