10,000 IU a day for vitamin d
The official rda of 800 IU was proven to be 10x too small due to a statistical error the researchers made when calculating how much was needed in the single paper that became the whole basis for 800 IU rda! One paper! With a huge mistake! And it's still on the side of all vitamin bottles and still the rda!
All Vitamin Recommended daily doses are purposely too low for any meaningful/ potential benefit. I still recall back 20-30 years Big Pharma literally attempted to introduce legislation to outright ban Vitamins/ Nutrients and Supplements being purchased by the Public without a fcking prescription from a DR. Take Vitamin C for instance. A prophylactic/ therapeutic dose is 5000-10 000 UI per day. Most are sold in 50mcg-100mcg and tell you on the bottle to take just one or two. Unless one purposely seeks out high strength doses, it's the same for all other vitamins etc. All Deliberately kept to such a low dose to game the results ....
800IU isn't even enough for a Vitamin D deficiency wtf.
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