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Nutrition Science and Everyday Application - beta v 0.1

Nutrition Science and Everyday Application - beta v 0.1

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SOURCES OF VITAMINS AND MINERALS 451<br />

Vitamins Made by Intestinal Bacteria<br />

Some vitamins can be synthesized not by our bodies, but by the helpful bacteria<br />

living within us. Bacteria in the gut can make vitamin K <strong>and</strong> B vitamins.<br />

• Bacteria that colonize the large intestine can synthesize one form of vitamin K,<br />

although the total amount made in the large intestine is not clear. 5<br />

• Gut bacteria are also able to make all B vitamins, though the amount synthesized<br />

of each vitamin is dependent on the composition of each individual’s<br />

microbiome. 6,7 Dietary choices (e.g. intake of high fiber foods or probiotics) <strong>and</strong><br />

medication use can alter a person’s microbiome, possibly promoting or inhibiting<br />

the production of vitamins in the large intestine. 8<br />

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