Collagen loss is the central process of visible skin ageing. From age 25, collagen production decreases by 1% per year. At menopause, this rate can accelerate to up to 30% loss in the first 5 years. The cumulative result: thinner skin, deeper lines, loss of firmness and uneven tone. The skincare challenge: intervene in this process with actives that have documented mechanisms on fibroblasts.

Why Topical Collagen Doesn't Work

Collagen is a high molecular weight protein (>300,000 Da). The skin barrier limits penetration to molecules below 500 Da. Topical collagen doesn't reach dermal fibroblasts — it works as a surface humectant, not as a synthesis stimulator. This doesn't make it useless, but it does make it poorly positioned.

The Actives That Do Stimulate Synthesis

Signalling Peptides

Peptides like Matrixyl (palmitoyl pentapeptide-4) are fragments of degraded collagen that act as signals to fibroblasts: "there's damaged collagen here, produce more." In vivo studies show measurable increases in collagen I and III after 4–8 weeks.

Vitamin C

Essential cofactor of prolyl hydroxylase and lysyl hydroxylase — the enzymes that add the hydroxyl bridges that stabilise the collagen triple helix. Without vitamin C, synthesised collagen is structurally weak and degrades more rapidly.

Bakuchiol

Activates the same collagen synthesis pathways as retinol (including positive regulation of collagen types I, III and IV) without binding to RAR receptors. No adaptation period, no photosensitivity.

The Collagen Stimulation Protocol

Morning: vitamin C → moisturiser → SPF
Night: collagen booster serum → bakuchiol (alternating nights) → ceramide cream