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Depends on the bacteria. For example, bacteria E. Coli is needed for production of vitamin K.
The bacteria absorb nutrients in the gut from digested food - the human benefits from the production of the vitamin.
It would end the production of vitamins because bacteria that live in your intestines make small amounts of vitamin K.
There are a number of ways that bacteria keep us healthy. Bacteria in the digestive system help use with certain types of vitamin production and absorption, for instance. Bacteria in the vagina help maintain the normal environment of the vagina.
Vitamin K is made from bacteria from the intestine.
Bacteria in the digestive system are necessary for digestion and the production of vitamin K in the colon. Viruses rarely even make it to the stomach; they infect by reaching the bloodstream.
Bacteria in the large intestine can produce important vitamins for the body. For example, some bacteria produce vitamin K from eating fiber. Some bacteria also produce vitamin D.
Vitamin A
Shortest answer, no. Vitamin K is a vitamin.
Vitamin A
There are 4 forms of vitamin D, and the important ones are synthesized by the reaction between UV rays and cholesterol in our skin. Vitamin K2 is synthesized in the guts by bacteria. Vitamin B3 Niacin is synthesized in small amounts by gut bacteria. Vitamin B5 Pantothenic Acid is synthesized in small amounts by gut bacteria. Vitamin B7 Biotin is synthesized in small amounts by gut bacteria. Vitamin B9 Folic Acid is synthesized in small amounts by gut bacteria. Vitamin B12 is synthesized in the guts by bacteria.
The Colon