Collagen, Protein and Your Skin: Fact vs. Marketing

Collagen supplements are one of the fastest-growing corners of the beauty market: powders in coffee, gummies, “beauty shots”. The pitch is intuitive — collagen keeps skin firm, so eating collagen should keep skin firm. The biology is less straightforward.

What happens when you swallow collagen

Collagen is a protein. Like any protein you eat, it is broken down in the gut into amino acids and short chains called peptides. Some of these peptides are absorbed into the bloodstream, and researchers think they may signal skin cells to make more collagen — but your body decides where to use them. It is not a direct delivery to your face.

What the research shows

A 2021 systematic review and meta-analysis pooled 19 randomised trials involving more than 1,100 people taking hydrolysed collagen for around three months. Overall, the supplements were associated with improved skin hydration and elasticity compared with placebo.¹

The caveats matter. Many of the trials were small, used different products and doses, and were funded by manufacturers — and the reviewers themselves called for larger independent studies. In other words: promising, but not proven to the standard of, say, sunscreen or retinoids.

What definitely matters

Protein. Your body builds collagen from amino acids, so eating enough protein — from fish, eggs, dairy, pulses, poultry or meat — is the foundation.

Vitamin C. It is essential for collagen production, and low levels are associated with poorer skin healing.² Most people can get enough from fruit and vegetables; the NHS notes that most adults do not need a supplement.³

Protecting what you have. Ultraviolet light and smoking break down collagen in the skin. Daily sunscreen and stopping smoking will do more for your skin’s collagen than any powder.

If you enjoy a collagen drink and it fits your budget, it is unlikely to harm you. Just do not let it replace the habits with stronger evidence.

Who should be cautious

Collagen products are often made from fish, cattle or pig sources, which matters for allergies and dietary choices. If you have kidney disease, are pregnant or take regular medication, check with a doctor or pharmacist before adding high-protein supplements.