In humans there are 13 vitamins: 4 fat-soluble (A, D, E and K) and 9 water-soluble (8 B vitamins and vitamin C).
The following table gives a summary of these vitamins, recommended daily allowance, deficiency and overdose information:| Vitamin name | Chemical name | Solubility |
Recommended dietary allowances
(male, age 19–70) | Deficiency disease |
Upper Intake Level (UL/day) | Overdose disease |
| Vitamin A | Retinoids (retinol,retinoids and carotenoids) | Fat | 900 µg | Night-blindness and Keratomalacia | 3,000 µg | Hypervitaminosis A |
| Vitamin B1 | Thiamine | Water | 1.2 mg | Beriberi | N/D | ? |
| Vitamin B2 | Riboflavin | Water | 1.3 mg | Ariboflavinosis | N/D | ? |
| Vitamin B3 | Niacin | Water | 16.0 mg | Pellagra | 35.0 mg | "Niacin flush" |
| Vitamin B5 | Pantothenic acid | Water | 5.0 mg | Paresthesia | N/D | ? |
| Vitamin B6 | Pyridoxine | Water | 1.3-1.7 mg | Anemia | 100 mg | Impairment of proprioception |
| Vitamin B7 | Biotin | Water | 30.0 µg | None identified | N/D | ? |
| Vitamin B9 | Folic acid | Water | 400 µg | Deficiency during pregnancy is associated with birth defects, such as neural tube defects | 1,000 µg | ? |
| Vitamin B12 | Cyanocobalamin | Water | 2.4 µg | Megaloblastic anaemia | N/D | ? |
| Vitamin C | Ascorbic acid | Water | 90.0 mg | Scurvy | 2,000 mg | Refer to Vitamin C megadosage |
| Vitamin D | Ergocalciferol and Cholecalciferol | Fat | 5.0 µg-10 µg | Rickets and Osteomalacia> | 50 µg | Hypervitaminosis D |
| Vitamin E | Tocopherol and Tocotrienol | Fat | 15.0 mg | Deficiency is very rare; mild hemolytic anemia in newborn infants. | 1,000 mg | ? |
| Vitamin K | Naphthoquinone | Fat | 120 µg | Bleeding diathesis | N/D | ? |
