Vitamin D is hormone play extensive functions in body.Low vitamin D level cause impairment of calcium metabolism.It help absorb calcium from gut. low testosterone depression erectile Dysfunction and low libido.Low vitamin D is cause of low sperm and low sprem motility.Reduce vitamin D cause weak bones ,pain and Aches in body.Low vitamin D
Cause oesteoprosis.Sunshine is important sources of vitamin D .Fatty fish red meat Nuts are food source of vitamin D.
Vitamin D is available in form of tablets as well.D epot form vitamin D also available .One needs to get blood test to determine dosage of vitamin