 [ Symptoms ] i read an artical that said you can take more than 10 000iu of vitamin d3 for weight lose is that true health risks [ Disease ] vitamin d is not given for weight loss but it is common for people with excess weight to have low vitamin d levels a doctor may prescribe very high levels to bring levels back up it is not recommended for someone to give themselves more than the tolerable upper limit of vitamin d 4 000iu unless prescribed by a doctor although toxicity is rare it can occur causing increased calcium levels in the blood for more on vitamin d supplementation see this article