What it is
Magnesium sulfide is the magnesium salt of hydrosulfuric acid, an inorganic compound rarely encountered in finished cosmetic products. When listed, it appears at low levels and is not a primary functional component of a sunscreen system. Because its cosmetic use is limited, formulators typically rely on more common magnesium salts for similar mineral or texturizing purposes.
Origin & sourcing
Synthetic inorganic compound; manufactured rather than sourced from plants.
Questions everyone asks
Is magnesium sulfide a UV filter?
No. It is not a UV-absorbing or UV-reflecting filter and does not contribute sun protection on its own.
Is magnesium sulfide common in sunscreens?
No. It is an uncommon cosmetic ingredient and appears in only a small number of formulas.