Lifestyle
Niacin Flushing: What It Is, Why It Happens, and What to Do
Niacin (Vitamin B3) can cause flushing — warmth, redness, and tingling across the face, arms, and chest. This is harmless but can be uncomfortable, especially the first time. It occurs because niacin causes blood vessels to dilate near the skin surface. The effect typically diminishes with regular use. See the NIH niacin fact sheet.
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