The latest Endocrine Society guidelines suggest a lower daily intake of 600-800 IU for the general population, a reduction from their previous recommendations.

The Endocrine Society now advises against routine screening for vitamin D levels because we don't actually know what the optimal levels should be.

A clinical trial found that daily doses of 4,000 and 10,000 IU of vitamin D actually decreased bone density in the wrist by 2.4% and 3.5% respectively.

In a study of older women, those taking the highest doses of vitamin D had an increased rate of falls, especially if they had a previous history of falling.

In one study, women taking 2,800 IU of vitamin D daily experienced a 9% decrease in hand grip strength and a 13% decrease in leg strength after three months.

Contrary to earlier findings, a large 2020 meta-analysis found that vitamin D supplementation made no difference in all-cause mortality for the general population.

Supplementation during pregnancy with around 3,000 IU of vitamin D daily can lower the risk of serious complications like preeclampsia and preterm birth.

Reflecting the new research, the speaker reduced the vitamin D dose in their supplement, micro viamin, from 2,000 IU down to 1,000 IU.