What it is
Magnesium Aluminum Hydroxide Carbonate is a layered double-hydroxide mineral commonly called hydrotalcite, built from sheets of magnesium and aluminum hydroxide with carbonate ions between the layers. In cosmetic formulas it functions as an absorbent and bulking agent and can help stabilize and control the texture of emulsions. Its layered structure also lets it act as an acid scavenger.
Safety & warnings
It is an inert mineral powder generally well tolerated in topical products. As with any fine powder, care is taken during handling of the raw material to avoid inhalation. It is not a recognized fragrance allergen.
Origin & sourcing
Mineral-based; occurs naturally as hydrotalcite and is also produced synthetically.
Questions everyone asks
What is hydrotalcite?
It is the common name for this layered magnesium-aluminum hydroxide carbonate mineral, valued for its absorbent and texturizing properties.
What is its role in a sunscreen?
It works as an absorbent and bulking agent that can help stabilize the emulsion and refine the texture.