Vitamin D may be one of the simplest solutions to a wide range of health problems, from diseases of the eyes, to the bowels, and conditions rooted in chronic inflammation and immune dysfunction in particular
If you have any of the following conditions, optimizing your vitamin D is indicated: dry eye, macular degeneration, multiple sclerosis, bowel diseases, rheumatic diseases, HIV, depression, and pregnancy
To maximize benefits, you need a vitamin D level of at least 40 ng/ml (a more ideal level may be 50 to 70 ng/ml) from all sources — sun exposure, tanning bed, vitamin D-containing foods, and/or vitamin D supplements