Which of the following vitamins is synthesized in the body by intestinal bacteria_______?
A. Vitamins B1
B. Vitamins B12
C. Vitamins E
D. Vitamins K
Which of the following vitamins is synthesized in the body by intestinal bacteria_______?
A. Vitamins B1
B. Vitamins B12
C. Vitamins E
D. Vitamins K