There is no such thing as niacin chewable tablets being an IQ tax, niacin chewable tablets refer to niacin tablets, which are used for the treatment and prevention of niacin deficiency such as pellagra. Niacin is a vitamin that is often used in cases of niacin deficiency, and when using niacin tablets you can experience redness in the blood vessels of the face and neck, and may have adverse reactions such as headaches, and when overdosed it can lead to weakness, dizziness, and nausea. The contraindications of this drug are not clear, but people with diabetes, glaucoma, gout should avoid taking it. It is recommended to go to the hospital in time when symptoms occur, and should also be noted that this drug should be used under the guidance of a doctor, to avoid unauthorized use of drugs.