Collagen, peptides and amino acids — the hierarchy of building blocks
To understand collagen peptides, you have to start with the hierarchy. Amino acids are the building blocks — glycine, proline, hydroxyproline. Linking them into chains (from a few to several dozen) creates peptides. Linking thousands of amino acids into three twisted chains creates collagen, one of the largest proteins in the human body (molecular weight approx. 300,000–400,000 Da).
This scale has direct cosmetic consequences: the epidermal barrier (stratum corneum) freely lets through molecules below approx. 500 Da. Collagen peptides at 500–5,000 Da penetrate with the help of water and carriers. The whole collagen molecule doesn't pass through the epidermis. That's why "serum with collagen peptides" and "collagen cream" are two completely different products with different mechanisms of action.
Collagen cream = collagen stays on the skin's surface as a moisturizing film (valuable, but cosmetic). Collagen peptide serum = peptides penetrate the skin and "talk" to fibroblasts (pharmacological action at the cellular level).
Three types of collagen peptides and what each one does
They tell fibroblasts: "produce more"
This is the most important category. They mimic fragments of degrading collagen — fibroblasts receive them as a signal of matrix damage and initiate synthesis of new fibres. WellU's Biopeptide Complex contains fractions from lumican, decorin and histones — extracellular matrix proteins that showed exceptionally strong signalling action in studies.
Examples: Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7 (Matrixyl), marine collagen fractions from Biopeptide Complex.
They relax facial muscles
They act on neuromuscular junctions, limiting the muscle contractions responsible for expression lines. They don't "paralyze" muscles like Botox — they work more gently and gradually. The best-known cosmetic neuropeptide is SYN-AKE (Dipeptide Diaminobutyroyl Benzylamide Diacetate), used in the Syn Ake Eye & More serum from Larens' Beauty Intensive Duo set.
They act as a "taxi" for other ingredients
They carry active ingredients (copper, manganese, other peptides) deeper into the skin than the same ingredients applied without a carrier. Copper peptides (e.g. GHK-Cu) are particularly prized — they speed up healing, have antioxidant effects, and stimulate collagen synthesis through their own mechanism.
What sets Biopeptide Complex apart from other peptide complexes?
Most commercial "peptide complexes" in cosmetics contain 1–5 synthetic peptides in a standardized form. WellU's Biopeptide Complex is several hundred peptide fractions obtained from freshwater fish collagen — not synthetic, but natural, with preserved biological activity.
The key fractions are those from lumican (a proteoglycan regulating collagen fibre organization), decorin (regulates collagen fibre thickness and number) and histones (nuclear proteins with signalling properties). These fractions are obtained through cold extraction and preserved through lyophilization — processes that protect their biological activity.
| Fraction | Source | Role in skin |
|---|---|---|
| Lumican peptides | Fish extracellular matrix | Regulation of collagen fibre organization |
| Decorin peptides | Fish extracellular matrix | Control of collagen fibre thickness and density |
| Histone peptides | Cell nuclei | Signalling action on cell DNA regeneration |
| Oligopeptides (7–29 aa) | Marine collagen | Stimulating collagen and elastin synthesis by fibroblasts |
Collagen peptides and molecular weight — why it matters
Not all "collagen peptides" on the market are equal. The key parameter is molecular weight — the smaller it is, the deeper they penetrate. Dietary supplements with collagen hydrolysate below 2,000 Da are well absorbed by the gut. Cosmeceutics with peptides below 1,500 Da penetrate deepest through the skin. Products without molecular weight information are hard to properly evaluate for real effectiveness.
Content based on WellU scientific materials, cosmetology literature, and SYN-AKE ingredient documentation (Pentapharm/DSM). For informational and educational purposes.