Vitamin D supplements are widely used for bone health and immunity, but excessive intake can lead to silent side effects.

Calcium and phytates that are often in protein powder can block iron absorption, according to Theresa Gentile, MS, RDN, CDN, a Brooklyn-based registered dietitian and national media spokesperson for ...

Vitamin D3 plus calcium offers no overall bone or muscle benefit in adolescents with perinatal HIV infection but appears to increase lumbar spine bone density in those with vitamin D insufficiency.