The best swimmers among female Ironman triathletes complete the swimming portion of the event in 50 minutes to an hour. At the World Championship, the cutoff time for all competitors is two hours, 20 minutes. Any participant who fails to complete the 2.2-mile swim within that time is eliminated from the competition.
Vitamin K: One of two naturally occurring fat-soluble vitamins (vitamin K1 and vitamin K2) needed for the clotting of blood because of an essential role in the production of prothrombin (a clotting factor).
Humans and all vertebrates require cobalt, although it is assimilated only in the form of vitamin B12. B12 synthesis is known to occur naturally in the human small intestine (in the ileum), which is the primary site of B12 absorption.As long as gut bacteria have cobalt and certain other nutrients, they produce vitamin B12. Dr Michael Klaper argues that vitamin B12 is present in the mouth as well and intestines.umans and all vertebrates require cobalt, although it is assimilated only in the form of vitamin B12. B12 synthesis is known to occur naturally in the human small intestine (in the ileum), which is the primary site of B12 absorption.