Vitmain D was first known for its importance in maintaining healthy bones and acting as a hormone precursor.  A deficiency is associated with a host of conditions including: diabetes, depression, Alzheimer’s, dementia, concerns in pregnancy, obesity, auto-immune disease, colitis, Crohn’s, lowered immune system, multiple sclerosis, asthma, eczema, allergies, heart diseases, cancers and others.  It is known as the “sun vitamin” but is a common deficiency even in people who have regular sun exposure or who may be taking regular vitamin D supplements.