People used to get a LOT more sun exposure and therefore vitamin D. Moderate sun exposure will give you around 20,000 IU of Vitamin D-3 a day, which is way more than is in most multivitamins. This is probably why your grandfather reports that no one had acne.
Article on it: http://lighttherapyo...min-d-and-acne/
Quote from article:
"Dear Dr. Cannell:
My teenage son has type 2 diabetes. I started him on 5,000 IU of vitamin D a day about 6 months ago. Three things have happened so far, he started losing weight, his blood sugars improved, and his acne went away. I know you have written about diabetes and weight loss with vitamin D but I can’t remember anything about acne?
Mary, North Dakota
I have had some reports that vitamin D cured acne but frankly, I didn’t believe them. Then I ran across this 1938 paper. You can read the entire paper yourself and see what 5,000 to 14,000 IU per day did for these patients with severe acne. When I was a kid, I always wondered why my pimples got better in the summer and worse in the winter."
Edited by Green Gables, 03 May 2012 - 10:23 AM.