I would take a formula recommended to me -> 900 iu per pound of body weight at one time. If no results in a day, do it again the next day. If no results the second time it won’t help. You can get it at WalMart. The 5000 mcg size is optimum because it comes in tiny gelcaps and I, at least, can take the whole bunch in one gulp.
What are you talking about ?
I’m taking D
Always have