Calcium phosphates

Calcium phosphates (E341) include monocalcium phosphate (Ca(H₂PO₄)₂), dicalcium phosphate (CaHPO₄), and tricalcium phosphate (Ca₃(PO₄)₂), each with distinct solubility and reactivity profiles that determine their food applications. Monocalcium phosphate is a fast-acting leavening acid in baking powder, reacting with sodium bicarbonate to release carbon dioxide and provide rise in baked goods. Dicalcium phosphate serves as a calcium supplement and anti-caking agent. Tricalcium phosphate (also called calcium orthophosphate or bone ash) is used as a flow agent in powdered foods, a calcium fortification ingredient, and an anti-caking agent in spices, table salt, and powdered dairy products.

JECFA evaluates calcium phosphates under the same group ADI as all food-grade phosphates: 70 mg/kg body weight per day expressed as phosphorus (evaluated 1982). The ADI is well above typical food additive exposure levels, and calcium phosphates carry an inherent nutritional advantage over sodium phosphates — they contribute calcium alongside phosphorus, maintaining a more favourable calcium:phosphorus molar ratio in the diet. For this reason, calcium phosphates are preferred over sodium phosphates when both functionality and nutritional neutrality are considered. In calcium-fortified foods, calcium phosphates provide highly bioavailable calcium, with absorption rates comparable to dairy calcium.

Calcium phosphates are authorised under EU Regulation (EC) No 1333/2008 at quantum satis in many categories and at specified maximum levels in others. They are listed as GRAS in the United States under FDA 21 CFR §182.1217 (monocalcium phosphate), §182.1215 (dicalcium phosphate), and §182.1187 (tricalcium phosphate). Tricalcium phosphate is not permitted in Japan as a food additive. Unlike sodium phosphates, calcium phosphates are considered nutritionally beneficial at typical food additive use levels, contributing to calcium nutrition without the negative blood pressure implications of excess sodium. They are widely used in infant formula and children's food products as a safe calcium source.