B12, B1, B2, B5 and some others
bacteria in the intestines
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 K is the fat-soluble vitamin produced by bacteria in the gastrointestinal tract that plays a key role in blood clotting.
Vitamin D, which can be synthesized in the skin through exposure to sunlight, and vitamin K, which is produced by bacteria in the intestines.
Vitamin K is a fat-soluble vitamin produced by bacteria in the GI tract. In needs fat (lipids) to be absorbed by the intestines. You do not need to add extra Vitamin K.
We don't get any special proteins from microorganisms. What we get is vitamin K which is produced from a bacteria called E.coli and which lives in our intestine.
Vitamin K is made from bacteria from the intestine.
Vitamin D
Vitamin "K"
No vitamins are produced by the large intestine, per se. Instead, special bacteria in the colon (large intestine) synthesize vitamin K and some B vitamins, which are then passed back to your body tissues from the colon. Cenva
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.
There are a selection of vitamins that are in the Vitamin K group. These are known as K1-K5. Vitamin K1 is not produced by the body but is absorbed from foods such as green leafy vegetables (spinach, cabbage, broccoli) and some fruits such as avocado and kiwi fruit. Vitamin K2 is produced by bacteria in the large intestine. Vitamins K3-K5 are synthetic and are not generally used for human consumption.