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When it's used as a treatment to increase your HDL cholesterol or correct a vitamin deficiency, niacin is sold in higher doses that are prescribed by your doctor. Prescription-strength niacin includes such drugs as Niacor and Niaspan. Niacin is also available as an over-the-counter supplement.
Super high doses of niacin have been used for 15 years as a means of cleansing the bloodstream of THC. THC is stored in adipose tissue, making a cleanse ineffective for more than four to six hours. High doses of niacin also reliably produce unpleasant side effects ranging from skin flushing to nausea and vomiting.Flush-free niacin, while free of the unpleasant effects of standard niacin, is ineffective as a THC cleanse.revent THC from entering your body from all possible vectors. Niacin cannot aid in the removal of THC from the body if it has not been removed from the environment. Four to six hours before your desired cleanse, take 500mg of niacin orally. Anticipate unpleasant side effects, particularly skin flushing.