Ingredient dictionary

Betaine

Also listed as: Trimethylglycine, Glycine betaine

Betaine is a naturally occurring, gentle compound that attracts and holds water, mainly used to keep skin and hair hydrated. It is on the label of 42 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Betaine does

Attracts and holds water in hair and skin
Adds softness and slip to hair
Helps hair feel smoother after rinsing

Betaine is found naturally in sugar beets. Most cosmetic betaine is made from the byproduct of beet sugar processing, so it is plant-derived. Chemically, it is closely related to the amino acid glycine, and it is neutral overall even though it carries both a positive and a negative charge.

Formulators use betaine because it draws moisture into the outer layers of skin and hair. In shampoos, it helps hair feel softer and smoother, and it can ease the dry, tangled feel some cleansers leave behind. It is water-soluble and light, so it feels slippery rather than heavy and blends easily into rinse-off products.

Good for

Suits most hair and skin types, especially dry, frizzy or dull hair that needs extra moisture.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is betaine safe for sensitive skin?

Betaine is generally well tolerated and often used in gentle formulas. As with any ingredient, a product can still irritate some people, so patch testing a new shampoo or lotion is a sensible habit.

Does betaine make hair greasy?

No. Betaine is water-loving and rinses away easily, so it is not known for leaving hair heavy or oily. It is usually one of several conditioning ingredients in a formula, adding softness without a waxy film.