Caused acne, boils, headaches, and migraines. Unfortunately, Doctor's Best includes excessive amounts of B12, niacin, and biotin, which I believe is the issue as I experienced severe headaches and acne that left scars on my face, back, and arms. After two months of confusion, I realised the B complex was the culprit. Upon stopping, the flushing ceased and my headaches diminished. I recommend Doctor's Best to reduce certain vitamins substantially.
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