What are the ingredients in B Complex MF sourced from?

Ingredient	Source
Thiamin (as thiamine hydrochloride), Vitamin B12 (as adenosylcobalamin and hydroxycobalamin), Folate (as folinic acid), Riboflavin (as riboflavin 5'-phosphate sodium), Niacin (as inositol hexanicotinate and niacin), Vitamin B6 (as pyridoxal 5'-phosphate), Biotin, Pantothenic Acid (as d-calcium pantothenate)	Synthetic