Posted 5/25/2016 12:07 PM (GMT -5)
As Dikid said 2,000 IU is a safe amount to start out for most people. But to really understand how much to take you should get your blood levels of vit D tested. The ideal level for disease prevention is from 40 to 60 ng/ml. Over 100 ng/ml is flirting with overdose. Check out the following website:
grassrootshealth.net/
The chart on the top right of the website explains how much extra vitamin D is needed to reach optimum levels depending on your current blood measurements. For example if your current level is 25 ng/ml then to get to 40 ng/ml you need an additional intake of 4,000 IU/day.
This applies for the average intake observed to produce noted serum levels in adults, 150 lbs average weight. Averages only. Since everyone is different you should get your blood levels checked again after supplementing for a few months. You might require more in the winter than in the sunny, summer months.