What it is
Two very different things under one name: the soothing clear inner gel, and the bitter yellow latex just under the rind.
Why your biology objects
The inner gel is benign, but the latex carries aloin — a stimulant laxative that the US National Toxicology Program found caused intestinal tumors in rats (non-decolorized whole-leaf extract). Labels rarely say which fraction they used, so a generic "aloe" in food is an open question, not a health drink.