Collagen is on the front of a great many jars, and the implication is almost always the same: this will rebuild the collagen your skin has lost. It will not. No cream does, ours included.
The reason is unglamorous. Collagen molecules are simply too large to pass through the outer layer of skin. They sit on the surface. Whatever is happening to the collagen deeper down, a cream applied on top is not reaching it.
So why is it in there at all?
Because sitting on the surface turns out to be useful. Collagen is a humectant — it holds water where it lands. Skin holding more water at the surface looks smoother and feels more supple, and fine lines are genuinely less visible when the skin around them is well hydrated.
That is a real benefit. It is simply a different one than the word usually implies. The honest sentence is "this helps your skin hold water," not "this rebuilds your skin's structure."
What to look for instead
If you want an ingredient with decades of evidence behind it for fine lines and texture, that is retinol, not collagen. Retinol speeds up how quickly skin turns over. It is also the reason a product can sting or flake in the first fortnight, which is worth knowing before you start rather than after.
A sensible way to read an ingredient list: work out which ingredient is doing the slow structural work, which is doing the surface work, and which is there to make the first two tolerable. Most good formulas have all three.
The short version
- Topical collagen does not rebuild your own collagen.
- It does hold water at the surface, which makes skin look and feel smoother while it is there.
- Retinol is the ingredient with the evidence for fine lines and texture.
- Any brand telling you a cream rebuilds collagen is telling you something that is not true.
We have written out every ingredient in our own cream, including this one, on the ingredients page — and what each part is actually doing.