eric76 wrote:
0_equals_true wrote:
Yes but you also produce most of you vitamin D from sunlight. The amount in food is little.
So you have to stock up, for the year.
I take 2,000 to 4,000 units of vitamin D per day in the winter.
Which unit? Sorry I'm being stickler there, it is just a bad habit to say 'units' of anything without specifying the unit. You are basically talking International Unit which is not a mass unit but is roughly equivalent to 50-100 micrograms in Vitamin D.
Hominoids survived without supplements for millions of years. Most people do no take vitamin D supplements, except given to some babies.
The body also syntheses it from cholesterol, in low light conditions. Not all animals can do this though, and different animals can get more Vitamin D from their diet.