1 international unit is contained in 25 nanograms (1x10-9) of active vitamin D. Then 600x25x10-9=15 micrograms or 0.015 mg or 0.000015 grams. Vitamins D is expressed rather in units because we consume with food inactive vitamin D, which is activated in our body under the effec to the ultraviolet radiation of the Sun.
Chat with our AI personalities