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"One International Unit (IU) equals 0.025 mcg of cholecalciferol (Vitamin D3) or of ergocalciferol (Vitamin D2)" [1]

[1] https://walrus.com/questions/converting-units-iu-of-vitamin-...

Hmm, so 2000IU. That doesn’t seem like a lot, but I guess it really depends on the person.

It's almost impossible that their symptoms were caused by vitamin d in this case. It takes times to build up and reduce vitamin d levels, changes wouldn't happen overnight

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