Glucosamine is a simple sugar and one of the basic building blocks skin cells use to make hyaluronic acid and other water holding molecules that give skin its cushion and structure. Applying it topically is thought to help support the skin's own hyaluronic acid production, and lab based skin models have shown that glucosamine sulfate can increase hyaluronic acid levels and improve markers at the boundary between skin's outer and deeper layers.
It is worth knowing that much of the published research on glucosamine for skin comes from scientists connected to the cosmetics industry, so independent academic confirmation is more limited than it is for its close relative, N acetyl glucosamine, which has a somewhat larger body of independent research behind it.
Glucosamine References
Glucosamine, an ingredient with skin and other benefits, Journal of Cosmetic Dermatology, 2006
Efficacy of Glucosamine Sulphate in Skin Ageing, Results from an ex vivo Anti Ageing Model and a Clinical Trial, Skin Pharmacology and Physiology, 2017
Our team reviews ingredient research and uses up-to-date evidence to rate ingredients based on the categories below.
Best
Ingredients with the most rigorous and convincing evidence. These are the standouts backed by consistent findings across independent, peer reviewed clinical research.. When we call an ingredient Best, it has earned that distinction through genuine, reproducible proof that it improves skin.
Good
Reliable, well tolerated ingredients that do their job without complaint. They may not carry the headline benefits of a Best rated active, but they hydrate, stabilize a formula, or support the ingredients around them in ways that make a real difference in how a product performs and feels.
Average
Ingredients that are perfectly safe and serve a clear function, typically as an emollient, thickener, or filler, but do not offer any meaningful skin benefit beyond that basic job. Not a red flag, just not a reason to choose one product over another.
Bad/Worst
Ingredients with documented potential to irritate skin, disrupt the barrier, or trigger sensitization in some users, often synthetic fragrance, drying forms of alcohol, or certain essential oils. Not automatically a dealbreaker for every skin type, but worth knowing about before you commit to a product.
