What this site is for
It exists to separate what is known about oral collagen from what is claimed for it, and to grade each claim honestly rather than presenting the strongest interpretation the literature will bear. That is why every claim is placed in one of four groups, why the mechanism question is treated as settled by digestion rather than as an open controversy, and why the claims that are supported are mostly about safety and about the product being ordinary.
What it deliberately does not do
It does not recommend for or against any product, and it does not invite a reader toward an assessment or a consultation. It is not a booking page and it offers no service in relation to anything it describes. It does not name brands, does not quote prices, and does not tell a reader who has bought a supplement that they have been foolish — the product is inexpensive and low-risk, and the error it argues against is a category error rather than a personal one.
The facts kept visible
Three facts are repeated wherever they are relevant. A swallowed peptide is digested, so it does not arrive at the skin as collagen. The amino acids it supplies are already available from ordinary protein, so supply is not the problem. And the products are regulated as food, so no approved indication for skin ageing exists and none is required for them to be sold.
How the content is reviewed and corrected
Ke He, MD, Deputy Director and Head of Skin & Laser Aesthetics, is the responsible physician. This subject moves slowly on the science and quickly on the marketing, so the review is dated and revisited on a short cycle rather than treated as a settled text. If you find something unclear, out of date or wrong, the contact page explains how to tell us, and the correction is made to the page itself.