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Intestinal bacteria are main source of which one of the following vita

June 1, 2025 by rawan239

Intestinal bacteria are main source of which one of the following vitamins ?

Vitamin E

Vitamin C

Vitamin B₁₂

Vitamin A

This question was previously asked in

UPSC NDA-2 – 2021

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The correct answer is C) Vitamin B₁₂.

Bacteria residing in the large intestine (colon) of humans are known to synthesize several vitamins, including Vitamin K and various B vitamins, particularly Vitamin B₁₂ (cobalamin).

While intestinal bacteria produce B₁₂, its absorption primarily occurs in the ileum (part of the small intestine) and requires intrinsic factor produced by the stomach. Dietary intake is the main source of Vitamin B₁₂ for humans, as the bacterial production in the colon might not be sufficient or readily absorbable. However, among the options provided, B₁₂ is the vitamin most notably associated with production by intestinal bacteria.

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