Knowledge of Health, Inc. Blog - February 11, 2008: Quercetin, a natural molecule found in onions, apple peel and other fruits, has been found to inhibit niacin-induced flush by 96% at a 1000 mg human dose. Aspirin reduced niacin flush by 30%. [British Journal Pharmacology Jan 28, 2008]
http://www.knowledgeofhealth.com/blog/2 ... flush.html
http://www.ncbi.nlm.nih.gov/pubmed/1822 ... d_RVDocSum