It seems difficult to reach excess vitamin D levels though. From [1]: "Taking 60,000 international units (IU) a day of vitamin D for several months has been sho

It seems difficult to reach excess vitamin D levels though. From [1]: "Taking 60,000 international units (IU) a day of vitamin D for several months has been shown to cause toxicity. This level is many times higher than the U.S. Recommended Dietary Allowance (RDA) for most adults of 600 IU of vitamin D a day." 5000-7000 IU per day is probably a safe amount, despite the official recommended daily intake being 600 IU. [1]: 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...