The Colon: Cesspool or Nutrient Factory?

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Abstract
The intense bacterial growth and activity in the colon probably account for the high temperature of its contents and of the effluent blood; thus, the high rectal temperature. This bacterial activity undoubtedly has other important actions in the body economy, including the liberation of potentially toxic substances and the production of nutrients.To take the last first, there is good evidence to believe that vitamin K, vitamin B12 and perhaps several other members of the vitamin B complex are produced in the colon. Vitamin K is surely absorbed, for this is an important source of the vitamin. Vitamin B . . .