Ingredient
Magnesium sulfate
No concern
Widely used and well understood at the amounts in food and beauty.
What it is
Magnesium sulfate — Epsom salt in a kitchen dose.
Why it’s used
A trace electrolyte in some waters.
What to know
Not a sports drink. Fine in the amounts in a bottle of water.
You’ll see it in
Alkaline and electrolyte waters.