Probably the best approach is this: - Go get a blood test and find out what your current levels are. if you are too busy to hit up your physician, blood tests

Probably the best approach is this: - Go get a blood test and find out what your current levels are. if you are too busy to hit up your physician, blood tests can be be purchased online without a doctor visit - After purchase, you just show up at Labcorp/Quest location and get your blood drawn. Vit D tests are pretty cheap at around $50 - If deficient, supplement with Vitamin D; 4000-5000 IU a day seems to be a good start. - Get a follow-up blood test a few months later to confirm that the current dosage is adequate. If it is great. If not, rinse and repeat as necessary... Everyone is unique so I think this i sthe best approach. Also, IMO being (too) afraid of the sun is one of the reasons this is such a problem in modern life.