Vitamin D3 supplementation at 5000 IU per day can have significant positive effects on subjective and objective health metrics.

“Listen, I have female family members who were having some health struggles, that for whom the only change was 5000 IU of vitamin D3 per day, and it made a significant positive effect on a number of different subjective metrics, and some objective metrics. And these were people that were getting their sunlight, and eating very high-quality food, and really putting time and effort into it.”