Betaine shows up in toners, serums and creams — and its name looks a lot like other ingredients. Here's what it is and how to tell it apart.
What betaine is
- A small, naturally occurring molecule, often sourced from sugar beets. Its chemical name is trimethylglycine.
- A humectant. Like glycerin and hyaluronic acid, it helps hold water in the top layers of skin, so skin feels more hydrated and comfortable.
- Gentle and lightweight, which is why it's common in formulas for sensitive skin.
How humectants fit with other moisturizing ingredients: humectants vs emollients vs occlusives.
Betaine is not the same as…
- Cocamidopropyl betaine — a mild cleansing agent (surfactant) used in cleansers and shampoos. Different molecule, different job.
- Betaine salicylate — an exfoliating ingredient related to salicylic acid. Also a different molecule.
So “betaine” alone on a leave-on product usually means the hydrating humectant.
Where you'll find it
- In the Supple Preparation Unscented Toner, betaine is the fourth ingredient, working alongside beta-glucan, panthenol and sodium hyaluronate for a hydrated, comfortable feel. (Its neighbor on the list, dimethyl sulfone, is explained in what is MSM?)
- In the Maple Energy Infusing Serum, it sits right after sugar maple sap, glycerin and tripropylene glycol.
Who it suits
Betaine suits most skin types, especially dry, dehydrated or sensitive-feeling skin. As with any product, patch test if your skin reacts easily.
FAQ
What does betaine do for skin?
Betaine is a humectant — it helps hold water in the top layers of skin, so skin feels more hydrated and comfortable.
Is betaine the same as cocamidopropyl betaine?
No. Cocamidopropyl betaine is a mild cleansing agent used in cleansers. Betaine is a hydrating humectant in leave-on products.
Is betaine good for sensitive skin?
It's a gentle, commonly used humectant and suits most sensitive skin. Patch test any new product.
Is betaine the same as betaine salicylate?
No. Betaine salicylate is an exfoliating ingredient related to salicylic acid.
Note: figures come from cosmetic clinical/consumer studies measuring the appearance and feel of skin. They are not medical claims; individual results vary; not intended to diagnose, treat, cure or prevent any condition. Always patch test.
