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by sn9 3476 days ago
Our skin stops producing Vitamin D once it's synthesized about 10,000 IU.

The RDA is only 400 IU.

There's mounting evidence that a regular intake in the thousands of IU (or synthesis from sun bathing, depending on your skin tone, latitude, and cloud cover) has health benefits beyond keeping you out of the hospital.

Examine.com has a comprehensive summary of the current research: https://examine.com/supplements/Vitamin+D/