Vitamin B9 & B12
Vitamin B9 (folate) is Isolated from spinach in 1945, term "folic" is from the Latin word folium (which means leaf) because it was found in dark-green leafy vegetables. Vitamin B12 (cobalamin) contains cobalt, name derived cobal from cobalt, amin from vitamin. Vitamin B12 supplements are in the form cynocobalamin, converted to its active form in the body.