Collagen and skin ageing: what really happens and what can be done

The skin has three layers: the epidermis (surface), the dermis (middle layer) and the hypodermis (deeper fatty layer). Collagen sits mainly in the dermis, where it makes up roughly 70 % of its dry weight. Together with elastin it forms an elastic network that gives skin firmness, density and the ability to snap back after deformation.

Fibroblasts, the cells in the dermis, continuously produce and renew collagen. With age their activity declines. The result: the network of collagen fibres thins, elastin fragments and the dermis loses volume. The surface layer then lacks a sufficient structural base, wrinkles form and the skin looks tired and less defined.

Age: a natural decline of 1 to 2 % a year from the mid-twenties. By forty, a woman loses roughly 15 to 20 % of her collagen capacity.

Menopause: estrogen regulates collagen synthesis. According to a review in Dermato-Endocrinology (Thornton, 2013), women lose up to 30 % of skin collagen in the first five years after menopause.

UV radiation: UVA rays activate matrix metalloproteinases (MMP), enzymes that cleave collagen fibres. It is one of the fastest mechanisms of collagen degradation.

Glycation: excess sugar binds sugar molecules to collagen fibres, which stiffen and lose elasticity. This damage is hard to reverse.

Smoking and chronic stress: both raise free radicals and cortisol, which actively suppress collagen production.

Hydrolysed collagen peptides below 500 Da pass the intestinal barrier and reach the bloodstream. Some of them accumulate in the skin, where they stimulate fibroblasts to produce new collagen, elastin and hyaluronic acid. It is not topping up collagen from outside, it is a biological signal for the body's own production.

A randomized 2024 study (Journal of Clinical Medicine, 112 women, 8 weeks) showed statistically significant improvements in elasticity (p = 0.009), hydration (p < 0.001) and skin texture without any exercise protocol. A 2019 systematic review (11 randomised trials, 805 people) concluded that oral collagen increases skin elasticity and hydration.

Supplementation will not reverse the genetic factors of ageing, will not replace dermatological procedures in significant photoageing, and will not override the chronic effect of smoking, glycation or UV radiation without changing those factors.

A realistic expectation: after 8 to 12 weeks of consistent use, there is a measurable improvement in hydration and elasticity. Visibly younger skin is the result of combining supplementation, UV protection and a healthy lifestyle, not the sachet alone.