Commercial forms of niacin
Nicotinic acid, 3-pyridinecarboxylic acid is a white
or light yellow crystal or crystalline powder. It is odorless or has a slight odor.
It is freely soluble in boiling water.
Niacinamide is also a white, crystalline powder.
It is odorless or nearly so but does have a bitter taste. Its solutions are neutral to litmus.
Storage should be in well-closed containers.