Vitamin K

Vitamin K also exists in another biologically active form, Phytomenadione / Vitamin K1, which forms the major dietary vitamin K component in green vegetables
Bolton-Smith et al. 2000 Br J Nutr 83(4): 389-99

Evidence is also mounting for an expanded role for vitamin K beyond coagulation (Suttie 2009 New York: CRC Press Taylor & Francis Group) in processes including cognition.

In addition, vitamin K is involved in alterations in the metabolism of sphingolipids (Denisova & Booth 2005 Nutr Rev 63(4): 111-21), linked to aging, [Parkinson's…