Vitamin D3 is produced when the skin is exposed to ... and some are as high as 10,000 IU, says Adamian. "There's so many ...

A 21-year-old man or women exposed to summer UVB light generates 10,000 IU (the equivalent of 250 mcg, 25 multivitamin pills of vitamin D, or 100 glasses of milk) of vitamin D in 15 to 20 minutes.

Cording suggests looking for vitamin D3 supplements that also contain K2 ... just below normal may benefit from taking 5,000 to 10,000 IU of vitamin D, according to Cording.

Vitamin D3 is the most effective form of vitamin D ... The maximum strength formula with 10,000 IU per single organic tablet is perfect for those who require a higher dosage of Vitamin D.

"There are purified vitamin D3 supplements on the market at 10,000 IU per capsule," Ross says, "so some manufacturers are, knowingly, not playing safe with the public." Again, it is inadvisable to ...

Historically, 400 IU (10 ug) of vitamin D was recommended for better health because it closely approximated the amount of vitamin D in a teaspoonful of cod liver oil. However, 800 to 1,000 IU is ...