Collagen and Skin: What Is Actually Known
Collagen supplements are everywhere. Here is what collagen is, what happens when you swallow it, and how to read the claims made about it with a clear head.
Collagen is the most abundant protein in the human body. It forms much of the structural framework of skin, joints, tendons, and bone. Natural production gradually declines with age, which is the starting point for most marketing you will see.
What happens when you swallow collagen
This is the part most articles skip. Collagen is a protein, and your digestive system treats it like any other protein. It is broken down into amino acids and short chains called peptides before absorption. Swallowed collagen does not travel intact to your face.
What supplement makers work with instead is hydrolysed collagen, sometimes labelled collagen peptides. Hydrolysis breaks the large protein into smaller fragments before you ever take it, which makes it dissolve more easily and absorb more readily as peptides and amino acids.
What the research suggests
There is a reasonable body of trial evidence on hydrolysed collagen peptides and measures such as skin hydration and elasticity, and much of it is mildly positive. It is worth holding that alongside some honest caveats:
- •Many studies are small, and a good number are funded by companies selling collagen
- •Effects reported are usually modest rather than dramatic
- •Trials typically run for eight to twelve weeks, so results appear slowly if they appear at all
- •Individual responses vary a great deal
Collagen is a food supplement, not a treatment. It cannot reverse ageing, and any product promising visible transformation in days is overselling.
Why vitamin C often appears alongside it
Your body needs vitamin C to synthesise its own collagen. That is why the two are frequently combined in one product. The logic is to supply both the raw material and the cofactor your body uses to build with it.
Setting sensible expectations
If you decide to try collagen, give it a fair run of two to three months and judge it on how your skin and joints actually feel, rather than on week-by-week changes. Keep the ordinary things in place too, because they are doing more work than any supplement: sun protection, sleep, enough protein in your diet, and not smoking.
This article is general information about nutrition, not medical advice. Food supplements are not intended to diagnose, treat, cure, or prevent any disease. If you are pregnant, breastfeeding, taking medication, or managing a health condition, speak to your doctor or pharmacist before starting a supplement.
