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aelephant comments on Public Service Announcement Collection - Less Wrong
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You need to take more than 4000 IU/day (probably for quite some time) to have any hope of toxicity. I knew a man who accidentally took 50,000 IU daily for one week (meant to be weekly per his prescription) and suffered no ill effects. Some people may even require doses above 4000 IU/day to get their Vitamin D levels up to target.
I take 10,000 a day. (20,000 is when I start feeling side effects.) It's done wonders for my general mood and energy levels. WARNING: Ramp up and proceed with caution.
Have you done any blood-work showing 10k IU to put your blood levels in the appropriate ranges?
Nuh.
How fast did the negative effects appear when you were taking 20k/day? What were they?
And how fast did you notice positive effects as you changed dosage?
Serious negative effects are supposed to take months to appear, even at 100k/day.
Negative effect: The metallic taste one, that day; I backed right off. Positve effects: within a few days.
Did you ramp up? That is, did you try 5k for weeks before trying 10k? Did you get any blood tests?