What it does
- Hydrates with a light, non-tacky feel.
- Helps protect cells against osmotic stress (osmoprotection).
- Softens the sensory feel and can reduce irritation potential of a formula.
How it works
Betaine is a compatible-solute osmolyte: cells accumulate it to maintain water balance under stress without disrupting proteins. In cosmetics it is widely documented as a gentle humectant that also improves skin feel and can reduce the sting of surfactant systems. It complements other osmolytes such as ectoin and trehalose.
Use level
- Typical use level
- typically 0.5–5%
Commonly 0.5–5%; a versatile, inexpensive humectant that improves feel at modest levels.
Formulation considerations
- Water-soluble; add to the water phase.
- Stable and broadly compatible, including in cleansers where it reduces harshness.
- Non-tacky, which makes it useful for lightweight textures.
What it pairs with & what to avoid
Pairs well with
- Glycerin, hyaluronic acid, trehalose, ectoin
- Surfactant systems (reduces irritation)
- Most actives
Use with care / avoid
- No notable incompatibilities
Regulatory status
Betaine is listed in the EU CosIng database and is a well-established, gentle cosmetic ingredient.
Common questions
What does betaine do in skincare?
It hydrates with a light feel and acts as an osmolyte that helps protect cells against water stress; it also improves sensory feel.
What percentage of betaine is used?
Typically 0.5–5%.
Is betaine good for sensitive skin?
Yes; it is gentle and is often added to cleansers to reduce harshness.