Betaine: Moisture from sugar beets
Active Ingredients Glossary · B
INCI: Betaine
Betaine may sound technical, but it comes from a very down-to-earth source: the sugar beet. In masks, serums, and shower gels, it quietly provides moisture and ensures that a formula feels gentler. Just be sure not to confuse betaine with its namesake from the cleaning industry.
What is betaine?
Betaine, chemically known as trimethylglycine, is a small molecule that plants and animals produce naturally to protect their cells from dehydration and salt stress. Experts refer to such protective substances as osmolytes. Sugar beets are particularly rich in betaine, and this cosmetic raw material is usually derived from their processing.
Caution: Risk of confusion—cocamidopropyl betaine is a mild surfactant, i.e., a cleansing agent, and shares only the name “betaine” with betaine. In the INCI list, you can identify the skin-nourishing betaine by the fact that it is listed simply as “betaine” without any additional designations.
Effect: What’s Been Proven
Three out of five bars: Betaine binds water and helps the skin retain moisture—similar to glycerin, but with a lighter, less sticky feel on the skin. Some studies also show that betaine can make cleansing products gentler because it reduces irritation caused by surfactants. That’s why it’s often found in shower gels and shampoos.
Honest assessment: The body of evidence is significantly smaller than for glycerin or hyaluronic acid. Its mechanism of action as an osmolite is well understood, but there are few large clinical studies on betaine alone in skincare. Betaine is a reliable ingredient, not a miracle cure.
Usage & Combination
Betaine fits into any routine, morning or night, and requires no adjustment period. It’s particularly effective in products that use water and surfactants, as well as in hydrating masks and serums. In SKIN REPUBLIC’s Hyaluronic Acid + Collagen Sheet Mask, betaine is listed fifth on the INCI list—right after the classic humectants.
Pairs well with
✓ Glycerin – the tried-and-true moisturizing duo
✓ Hyaluronic acid – binds additional water in the upper layers of the skin
✓ Mild surfactants – betaine makes cleansing more pleasant
Note
! Cocamidopropyl betaine is a surfactant, not a moisturizing ingredient
! For very dry skin, betaine alone is not a substitute for a moisturizing treatment
! If you have known sensitivities, always check the entire INCI list
Betaine in the BONSANA lineup
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View the Moisturizing Care Collection →Frequently Asked Questions About Betaine
Is betaine the same as cocamidopropyl betaine?
No. Cocamidopropyl betaine is a mild surfactant that cleanses and lathers. Betaine is a humectant derived from sugar beets. The two share only part of their name.
Where does betaine in cosmetics come from?
Mostly from sugar beets. Betaine is a byproduct of sugar beet processing and is purified for use in cosmetics. Chemically, the substance is called trimethylglycine.
Is betaine suitable for sensitive skin?
Yes, betaine is considered very mild and well-tolerated. It’s even used to make cleansing products gentler.
Can betaine replace glycerin?
It’s more of a complement. Both bind moisture, but glycerin has been studied much more extensively. Many formulas combine the two because betaine makes the skin feel lighter.
