Vitamin D is found in some calcium supplements ... The upper tolerable level is 1,000 milligrams (1,500 IU); the RDA is 30 IU. "There is no way to get an overdose from diet or fortified foods.

The exact amount of magnesium L-threonate you should take depends on your gender, age, and other factors. Find out the exact ...

Methotrexate, a common RA drug, destroys folate, so it’s recommended that doctors prescribe supplements for all patients taking it. How much: Recommended dietary allowance (RDA) = 400 micrograms (mcg) ...

The answer is yes. While vitamin B complex plays a role in energy, brain health, and other functions, taking too much can ...

Though this is a general guideline, The Endocrine Society does note that certain groups may need more than the RDA for vitamin D, including pregnant people and people with high-risk pre-diabetes.