'Flow agents' used in supplements and vitamins - a 'head's-up' on Magnesium Stearate.http://articles.mercola.com/sites/articles/archive/2012/06/23/whole-food-su
"Many supplement makers add “flow agents” and other fillers to their supplements. One potentially hazardous additive commonly used is magnesium stearate.
Magnesium stearate is essentially a chalk-like substance, which prevents the supplements from sticking together and allows the machinery to run smoother and faster, which equates to cost savings during the manufacturing process. Magnesium stearate is not a source of magnesium and has no benefits, but may have a detrimental effect on your immune function as stearic acid has been linked to suppression of T cells. The filler also stimulates your gut to form a biofilm, which can prevent proper absorption of nutrients in your digestive tract."
Also be aware of Maltodextrin; Aspartame; Mannitol; Corn - read through ALL the ingredients - you'd be surprised at what some supplements and vits may contain from 'some' mfc!