Most Americans are deficient in Vitamin D, programmer or not. [1].
One of the few supplements that are actually is a good idea, but don't overdo it, as it becomes toxic at higher levels.
You would not want to take more than 10 000IU per day and I'd probably recommend 2000IU-4000IU as a baseline. If you can afford the time and expense, the best is to close the loop and take a 25(OH)D blood test. You would want to have a serum level of between 30-70ng/mL. Given the studies I've read over a number of years I aim for around 55ng/mL, but there are differing views on this, so by all means do your own research.
One of the few supplements that are actually is a good idea, but don't overdo it, as it becomes toxic at higher levels.
You would not want to take more than 10 000IU per day and I'd probably recommend 2000IU-4000IU as a baseline. If you can afford the time and expense, the best is to close the loop and take a 25(OH)D blood test. You would want to have a serum level of between 30-70ng/mL. Given the studies I've read over a number of years I aim for around 55ng/mL, but there are differing views on this, so by all means do your own research.
[1] http://archinte.jamanetwork.com/article.aspx?articleid=41487...