What Is Tricalcium Phosphate?
FDA regulations at 21 CFR 182.1217 list calcium phosphate in its mono-, di- and tribasic forms as generally recognized as safe when used in accordance with good manufacturing practice. The European Food Safety Authority included monocalcium, dicalcium and tricalcium phosphate (E 341) in its 2019 re-evaluation of phosphate food additives, and set a group acceptable daily intake for phosphates of 40 milligrams per kilogram of body weight per day, which it says corresponds to an intake of 2.8 grams of phosphorus a day for an average adult weighing 70 kg.
For supplements, the NIH Office of Dietary Supplements says the two most common forms of calcium are calcium carbonate and calcium citrate, and that the percentage of calcium absorbed from supplements depends on factors including the form of calcium and the total amount of elemental calcium consumed at one time.
Sources checked September 15, 2026. Every point below links the page it came from.
The sources behind this answer
- Regulatory filingFDA regulations list calcium phosphate in its mono-, di- and tribasic forms as generally recognized as safe under good manufacturing practice. US FDA, 21 CFR 182.1217 (eCFR) ↗
- Government sourceEFSA included monocalcium, dicalcium and tricalcium phosphate (E 341) in its 2019 re-evaluation of phosphate food additives. European Food Safety Authority, via PubMed Central ↗
- Government sourceEFSA set a group acceptable daily intake for phosphates of 40 mg per kg of body weight a day, about 2.8 grams of phosphorus for a 70 kg adult. European Food Safety Authority ↗
- Government sourceThe NIH Office of Dietary Supplements says the two most common forms of calcium in supplements are calcium carbonate and calcium citrate. NIH Office of Dietary Supplements ↗
- Government sourceThe NIH Office of Dietary Supplements says calcium absorption from supplements depends on the calcium form and the amount taken at one time. NIH Office of Dietary Supplements ↗
Sources checked September 15, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.