THE FOUNDER’S VOICE

Shark, olives, or fermented sugars: squalane is exactly the same molecule. The biotechnological route is the best, but because of supply chain and purity considerations—not because of what it does to the skin.

Between October and December, cosmetics are discounted more than almost any other category. How to understand a discount, what goes into the price of a cream, and how we put together LeLang Black Friday.

Nutricosmetics and beauty from within are not legal categories: a supplement for the skin remains a food. What does this mean in terms of notification, authorized claims, and controls, and how do you read a label?

Tranexamic acid was originally developed as an anti-bleeding medication and works on dark spots differently from traditional brightening agents: it doesn’t block pigment production; it reduces the signal that triggers it.

Korean women did not perform an average of ten steps every evening, and Japanese women do not necessarily perform three: these are two narratives created for the Western market. What is really worth copying from the Japanese approach.

Beta-glucan is being presented as the new hyaluronic acid. In reality, it is a polysaccharide that works on the skin’s surface and its reactivity: it does something else, so the comparison is misleading.

GHK-Cu is a copper-bound tripeptide with interesting biological properties. The issue is not whether it works, but that it is often applied alongside something that neutralizes it: the sequence matters.