Yeah, but there's a huge gap between current RDA and toxicity. https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/vitamin

Yeah, but there's a huge gap between current RDA and toxicity. https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/vitamin-d-toxicity/faq-20058108 https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-h... 4000 IU per day would probably help a lot of people and is still an order of magnitude under the intake that's known to be toxic (60,000 IU/day for several months).