Description General description Nicotinic acid (pyridine-3-carboxylic acid) is also known as niacin or vitamin B3. It is a water-soluble vitamin found in some vegetable and animal sources. Niacin is also a precursor for the synthesis of NAD and NADP. Application Nicotinic acid-(ring-d4) can be used as an internal standard for the quantification of nicotinic acid in the biological sample by gas chromatography-mass spectrometry (GC-MS). It can be also used as a precursor for the preparation of N′-nitrosonornicotine-2,4,5,6-d4 derivative. Packaging 500 mg in glass bottle This product may be available from bulk stock and can be packaged on demand. For information on pricing, availability and packaging, please contact Stable Isotopes Customer Service.