Nicotinic acid is a product of the combustion of nicotine.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
His product might well be considered as Nicotinic acid contaminated with vitamines.
"The Vitamine Manual"
Walter H. Eddy
Later, when working with Drummond, Funk was forced to admit that his crystalline complex was not the pure substance, as analysis showed that it contained large amounts of Nicotinic acid.
"The Vitamine Manual"
Walter H. Eddy