Liquid Peptides by Medik8
Medik8’s Liquid Peptides serum is a dense, multi-peptide formula built around twelve separately named peptides rather than a single active. Among them is Palmitoyl Pentapeptide-4, the signal peptide covered in our dedicated guide, included here alongside several related palmitoyl-prefixed peptides intended to support the skin’s own collagen-related processes.
The formula also includes Acetyl Hexapeptide-8, the neurotransmitter-inhibiting peptide covered in our guide to that ingredient, and a targeted copper-delivery system the brand markets as encapsulated copper peptide technology, built from Copper Palmitoyl Heptapeptide-14 and a separate targeting peptide.
This kind of dense, multi-peptide formulation is a useful real-world example of the point made throughout our field guide to peptide types: many products combine several functional categories rather than relying on just one.
As with any cosmetic peptide product, claims here are limited to supporting the skin’s appearance, not treating or reversing any skin condition.
