The discovery of vitamins and their structure

Year of discovery

Vitamin

Source

1909

Vitamin A (Retinol)

Cod liver oil

1912

Vitamin B₁ (Thiamin)

Rice bran

1912

Vitamin C (Ascorbic acid)

Lemons

1918

Vitamin D (Calciferol)

Cod liver oil

1920

Vitamin B₂ (Riboflavin)

Eggs

1922

Vitamin E (Tocopherol)

Wheat germ oil, Cosmetic and Liver

1926

Vitamin B₁₂ (Cyanocobalamin)

Liver

1929

Vitamin K (Phylloquinone)

Luzerne

1931

Vitamin B₅ (Pantothenic acid)

Liver

1931

Vitamin B₇ (Biotin)

Liver

1934

Vitamin B₆ (Pyridoxine)

Rice bran

1936

Vitamin B₃ (Niacin)

Liver

1941

Vitamin B₉ (Folic acid)

Liver