Scientists say for non-pregnant, otherwise healthy Americans, vitamins are a waste of money because there isn’t enough evidence they help.

Tomatoes gene-edited to produce vitamin D could be a simple and sustainable innovation to address a large global health problem.

Study of older adults is 'first direct evidence' of protection against rheumatoid arthritis, psoriasis, other conditions.

Vitamin D is a critical nutrient and has many important functions in the body. A mother's vitamin D supply is passed to her baby in utero