The largest Vitamin D study, the VITAL trial, suggests that as long as you are not deficient, taking higher doses does not provide additional protection against cancer or cardiovascular disease.

Based on the new guidelines, the speaker reduced the Vitamin D in his own supplement, microvitamin, from 2,000 to 1,000 international units.

Similar to Vitamin D, there is no evidence that mega-dosing with supplements like Vitamin K2 and magnesium offers any benefits beyond meeting the recommended daily intakes.

Supplementing with around 3,000 IU of Vitamin D daily during pregnancy can lower the risk of pre-eclampsia and preterm birth.

Applying an engineering principle to medicine, it's better to eliminate the process of Vitamin D testing rather than trying to optimize for a specific blood level that has no evidence-based benefit.

New guidelines recommend against routine Vitamin D blood tests because we don't currently know what the optimal blood level is to target for better health outcomes.

After 13 years of new data, the Endocrine Society now recommends a lower dose of 600-800 IU of Vitamin D daily for healthy adults, down from its previous 1,500-2,000 IU recommendation.

Low Vitamin D levels may be a consequence of poor health, such as being sick and staying indoors, rather than the actual cause of the illness.