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

Vitamin K2 helps calcium bind to the bones and prevents it from building up in the arteries of the heart. Combining vitamin K2 with calcium may improve bone health more than using either supplement ...

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.