The body tightly regulates its internal vitamin D production from sun exposure, stopping further synthesis once adequate levels are reached to prevent toxicity. However, this safety mechanism only applies to sunlight. Taking high dose supplements bypasses this natural control, making toxicity possible. I’m not too worried about toxicity here. My main concern is when to take supplements to actualize the best stores of vitamin D.

If I take 6,000IUs in the morning and then am in the sun around noon, will my body not create vitamin D given that I had a 10x the daily need for vitamin D bolus just a couple hours before? Would it be better to be in the sun first, let my body produce vitamin D and then supplement if I am looking to maximize how much is in my body?

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