Collagen is roughly 70% of dry skin mass and underpins firmness. From the mid-20s, the body may lose about 1% yearly.
Why it declines
- Ageing
- UV / photoageing
- Smoking and pollution
- High sugar (glycation)
- Poor sleep and stress
How to stimulate renewal
Retinoids and vitamin C help at home; energy-based treatments remain among the most effective clinical tools.
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