No known adverse effect. Niacin Involved in the release of energy. Rich sources include liver, beef, pork, mutton and fish. Most breakfast cereals are fortified. Some is made in the body.
Deficiency leads to pellagra.
High doses cause dilation of arteries and reduction of blood lipids. Excess can cause kidney damage. B 12 Is necessary for the proper formation of blood cells and nerve fibres. Rich sources are offal and meat. Eggs and milk also contain B 12 .