For adults, a level of vitamin D in the blood of 20 nanograms per milliliter (ng/mL) or above is generally considered adequate. Levels below 20 ng/mL are generally too low for adequate bone health ...

Once you've reached the correct rank and pleased a region's clientele, you'll earn a referral to that region's dealer. If you struggle to find them, refer to the map above to see where you'll ...