In individuals with pre-existing gastrointestinal conditions such as inflammatory bowel disease, coeliac disease, or irritable bowel syndrome, introducing any new supplement may temporarily affect bowel habits as the digestive system adapts
[7] Niacin can cause vasodilation, so it should be avoided in those with serious hypotension
Scand J Rheumatol 1976;5:241-7
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News Release February 05, 2012 Fish oil and multivitamins most popular supplements in ConsumerLab.com survey -- Internet most popular place to shop WHITE PLAINS, NEW YORK FEBRUARY 5, 2012 A survey of over 10,000 savvy consumers of supplements shows the most popular supplements to be fish oil, multivitamins, vitamin D, calcium and CoQ10, in that order