Here are some Iâve found on the subject of art and art history. â 1  Art is not what you see, but what you make others seeâ -Edgar Degas. â 2 Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seenâ â Leonardo Da Vinci.
Other forms of vitamin B 3 include the corresponding amide and nicotinamide (niacinamide), where the carboxyl group has been replaced by a carboxamide group (CONH 2), as well as more complex amides and a variety of esters.
Niacin, also called nicotinic acid, is a B vitamin (vitamin B3) used in vitamin supplements and in combination with prescription drugs. It is most often used to prevent cardiovascular disease.iacin is used as a vitamin supplement to treat a lack of natural niacin in the body, to lower the risk of heart attack in people with high cholesterol who have already had a heart attack, and to treat coronary artery disease. Niacin is sold by prescription and over-the-counter OTC).