Today’s vitamin D recommendations may be enough to help provide rickets, but it does nothing to give protection from cancer, heart disease, and infections. Most adults need about 8,000 units of vitamin D, while there are others who may need over that required amount to optimize their vitamin D levels.
Vitamin D requirements are highly individual, and the amount that your body needs may depend on numerous factors, including the color of your skin, your location, and how much sunshine you’re exposed to on a regular basis. It is important to have your levels tested regularly using a 25(OH)D or 25-hydroxyvitamin D test. Vitamin D levels should never go below 32 ng/ml. Instead, you should aim to have your levels between 50 and 70 ng/ml.