Dibasic calcium phosphate (dicalcium phosphate) increases your dietary calcium. It dissolves less readily than calcium citrate, so absorption drops on an empty stomach. With a meal, it delivers a reliable dose of elemental calcium. Manufacturers often combine it with vitamin D in fortified foods and standard tablets.
People use it to help maintain bone density and joint function. Take it with food to improve absorption and reduce the chance of stomach upset. Doses vary by product and personal need. Pairing it with vitamin D helps your body use the calcium.
Calcium can block absorption of some medicines. Space this supplement at least 4 hours apart from certain antibiotics (tetracyclines, fluoroquinolones), thyroid medication (levothyroxine), and iron supplements. High calcium intake may raise the risk of kidney stones in people who are prone to them.