'Most types of E. coli work safely in your intestines; some even help make this blood-clotting vitamin'
Vitamin K
CHEMISTRY: Most types of E. coli work safely in your intestines; some even help make this blood-clotting vitamin
Most types of E. coli work safely in your intestines; some even help make this blood-clotting vitamin
Most types of E. coli work safely in your intestines; some even help make this blood-clotting vitamin
CHEMISTRY
Vitamin K
CHEMISTRY