E516: Calcium sulphate
What is E516?
Calcium sulphate (E516) is a calcium salt of sulphuric acid, known in mineral form as gypsum. It is a white, almost tasteless powder that is only slightly soluble in water.
Origin and production
Food-grade calcium sulphate is mined from natural gypsum deposits and purified, or produced synthetically, for example by reacting calcium carbonate with sulphuric acid.
Why is it used?
It is a traditional coagulant for tofu, helping soya milk set into a soft curd. It also acts as a dough conditioner and calcium source in breads and pastries, and as a firming agent and stabiliser in some frozen desserts and cakes.
Vegan, vegetarian and halal
Calcium sulphate is mineral in origin and suitable for vegans and vegetarians; it is widely used in vegan products such as tofu.
Safety and regulation
E516 is authorised in the EU and has been evaluated by EFSA. It is permitted in a wide range of foods at levels set by good manufacturing practice.
Written by the Foodlas editorial team with AI assistance and checked against EU Regulation (EC) No 1333/2008 and EFSA scientific opinions. Last reviewed: October 14, 2026.
Sources: Regulation (EC) No 1333/2008 · EFSA — Food additives · Wikidata
Common in
Products containing E516
