Polarised light micrograph of nicotinic acid, also known as vitamin B3. Meat, fish and vegetables provide a rich source of B3. Nicotinic acid can be produced by the body once a diet has an adequate supply of the amino acid tryptophan. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gaff, Karl |
Taille de l’image : | 4860 px × 3627 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |