Modern hyaluronic acid is fermented from plant sugars, not extracted from rooster combs as it once was. Here is where it really comes from, what sodium hyaluronate is, and the application mistake that makes it backfire.

Glycerin can come from vegetable oils or from beef tallow, and the ingredient list looks identical either way. Here is why the label cannot tell you, and the three reliable ways to check whether yours is plant-derived.