Niacin & Thyroid

I was taking 2000mg of niacin (inositol hexanicotinate) for Acne and what I suspected was a candida infection and I began to experience something strange. First, my eyebrows began thinning as well spots in my hairline, I also gained weight, and began having cold intolerance. I suspect that I became hypothyroid but in trying to remedy my situation I'm trying to determine exactly what happened.

In my search, I've come across a lot of contradiction in terms of how niacin affects zinc, iron, and copper. Can anyone tell me with certainty how niacin interacts with these minerals?

I pretty sure I'm zinc deficient, it's just a matter of determining whether I'm copper or iron (and cofactors) deficient.

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