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Biotin
Definition
Biotin, also called Vitamin B8 or H, is part of the family of B-complex vitamins. Biotin is found in the skin, brain, and the liver.

Functions
Biotin plays a role in:- maintaining the integrity of the skin,- metabolism of fat, protein, and carbohydrates.

Food Sources
Biotin is produced by bacteria in the gut. The best dietary sources are liver, kidney, and egg yolk. It's also found in nuts (walnuts, hazelnuts), fortified cereals, meats, lentils, and brewer’s yeast.

Biotin content in foods (µg/portion)
100g (4oz) of cooked chicken liver170
100g (4 oz) of grilled plaice57
1 dsp of food yeast20
1 egg yolk15
1 dsp of wheat germ2




Requirements
A normal diet largely covers the body’s biotin needs.

No recommended nutrient intake has been defined for this vitamin. Intakes of 10-200µg/day are believed to be safe.

Deficiency
Biotin deficiency is rare.

It occurs in the following cases:
- sick patients receiving all of their nutrition through their veins (parenteral nutrition) without adequate vitamin supplementation,
- large intake of raw eggs.

Deficiency in this vitamin causes skin problems and hair loss.

Excess Intake
No side effects have been reported for excessive biotin intake.

Normally, excess biotin is eliminated in the urine and stool.

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