Handily means done with ease.

He is a very handily person

Martin organized his watch repair workbench with tools standing up in their holders, so that when he knew which tool he needed, he could reach it handily.

I have no idea what protein pills are, but buying whey concentrate in powder form (whey is derived from cow's milk), which is what bodybuilders normally use for extra protein, would work handily because whey is easily absorbed by the body.

Watching Henry V should disprove this theory quite handily.