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I supplemented with 13,000 IU of D3 for years and the highest my blood levels ever got (per testing) was 63 ng/ml. Usually it was in the 50s.

When it comes to supplements, when I take a zillion mega dosed pills of anything, I am hard pressed to identify any effects at all. Some people seem to be hypersensitive to anything, I’m hyper-IN-sensitive to most things. They might affect blood work but if it wasn’t for that, I would think they were doing nothing at all.

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