What is Betaine?

Betaine, also called trimethylglycine, is a naturally occurring compound found in plants, animals, and the human body, commonly sourced for cosmetics from sugar beets. It belongs to a category of ingredients called osmolytes, which is a different classification from typical humectants like glycerin or hyaluronic acid. While humectants mainly work by attracting water to the surface of skin, osmolytes like betaine are more specifically associated with helping individual skin cells manage and maintain their internal water balance, especially under environmental stress.

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How Does It Work?

Unlike classic humectants that mainly work by drawing water to the outer surface of skin, betaine works at the level of the individual skin cell. As an osmolyte, it helps cells regulate the balance of water moving in and out of them, which becomes especially important when skin is under stress from dryness, temperature extremes, or other environmental factors. This cellular-level water management is thought to be part of why betaine is described as supporting skin comfort in addition to hydration.

Research has also looked at betaine's effect on the skin barrier more directly. In a four-week clinical study, daily use of a betaine-containing cream led to a measurable reduction in transepidermal water loss, meaning skin was better able to hold onto its own moisture. Separate laboratory research on skin cells found that betaine influences the expression of certain genes involved in skin structure, and studies have also found that adding betaine to cleansing formulas can help reduce the irritation those cleansers would otherwise cause, which is why it's sometimes included in gentler cleanser formulations.