Tablets must deliver accurate doses of active pharmaceutical ingredients (APIs)—typically verified by dissolution testing—and that requires scrutinizing the function and effectiveness of every tablet excipient, including magnesium stearate. Magnesium stearate acts as a lubricant, helping powder formulations flow and preventing tablets from binding in the die and sticking to the upper punch. Its effectiveness as a lubricant has made magnesium stearate the most common excipient in tablets, but it has drawbacks. Perhaps the most serious of these is its slowing of dissolution, which may compromise delivery of the API. This, among other reasons, has led the pharmaceutical industry to seek alternatives.