1, vitamin A: It is more common in cod liver oil, animal liver and green vegetables. Lack of vitamin A is prone to night blindness.

2. Vitamin B 1: It often exists in the form of thiamine pyrophosphate. Most of them are found in yeast, grains, liver, soybeans and meat.

3, vitamin PP: more common in nicotinic acid, nicotinic acid yeast, grain, liver, rice bran.

4. Vitamin B2: Also known as vitamin G, it exists in yeast, liver, vegetables and eggs. Lack of vitamin B2 is prone to oral inflammation (oral ulcer) and so on.

Extended data:

Vitamins, also known as vitamins, are life-sustaining substances, organic substances necessary to maintain human life activities and important active substances to maintain human health. The content of vitamins in the body is very small, but it is indispensable. Although the chemical structures and properties of various vitamins are different, they have the following similarities:

① Vitamins exist in food in the form of provitamins;

Vitamins are not components of tissues and cells, do not produce energy, and mainly participate in the regulation of metabolism;

③ Most vitamins can't be synthesized by the body or the synthetic amount is insufficient, which can't meet the needs of the body. They must always be obtained from food.

References:

Vitamins-Baidu encyclopedia