Where are you getting your D from? Lot's of whole food sources and the Sun? I agree (even though I'm a hypocrite here) that a 25 Hydroxy test should be done. But I don't get a lot of Sun, even in the Summer - so I do 10,000/Day on a guess, and based on the data showing perfect sun exposure at peak times, for a certain amount of time - yields 10,000iu max, before the body shuts off production. Been doing it for years by now (5?) The good thing about D is that toxicity requires millions of IU's (The mislabeled supps, and the guy that worked in a Vit D facility) and treatment is some Prednisone and staying out of the Sun for a bit. The Sun is the best source though - some additional chemical benefits you can't get with oral dosing. F It - I'm getting a 25OHD test this next go round of TRT blood work!