Argireline is a synthetic hexapeptide that mimics the N-terminus of SNAP-25, a protein required for neurotransmitter release at the neuromuscular junction.
Mechanism: Competes with native SNAP-25, modestly reducing muscle contraction in the target area. Effect is local and reversible. Nothing like Botox's neurotoxin mechanism.
Use case: Topical application on expression-line areas (forehead, crow's feet). Studies show 20–30% reduction in wrinkle depth over 30 days. Not a Botox replacement, but stackable with retinoids and other actives.
Caveats: Penetration is the limiting factor. Topical peptides struggle to reach the dermis. Best in well-formulated multi-peptide products. Concentration matters: look for 5–10%.