Quick answer: Niacin (vitamin B3) is part of energy metabolism and can cause warm skin flushing. Zinc supports normal testosterone in men who are low in it. Both have safe upper limits, so avoid stacking several supplements.
Niacin
Needed to turn food into energy. Higher doses widen blood vessels in the skin, causing harmless but uncomfortable flushing. Very high doses can affect the liver and blood sugar.
Zinc
Zinc deficiency lowers testosterone; topping up helps only if you are low. The adult upper limit is 40 mg a day, and long-term excess can lower copper.
What this means
Check your total from all supplements. See the NIH zinc fact sheet.
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General information, not medical advice. HoneyFil is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease.