G
Guest
There are also some long acting pills (not vitamins) that have a wax matrix that is meant to let the drug leach out slowly. The wax does not get digested but retains the original form. These pass through the digestive tract still in the shape of the pill. I'd don't know how many times I have explained this to nurses. There are obviously some pills that have been stamped to hard and don't dissolve but I think the real source of the legend is the undissolving matrix. The story does sell a lot of high profit brands of vitamins in health food stores.