I'm nitty picking now, but for most people you can't cure lactose intolerance because it's not a disease. It's more like the default state that adult mammals have. You might be able to rebuild some tolerance, but it's much easier to just take the artificial lactase and manage intake. One could argue that, biologically speaking, lactose tolerance is the off state and just so happens because we keep consuming breast milk well into adulthood (just not our own mother's).

Hmm, I’ve been intolerant my whole life, but I also used to drink milk daily during childhood, resulting in, for reasons I now know why, in a subpar youth ..

having discovered the lactase supplement has finally given me some peace of mind :)

Yeah - humans have adapted to be able to use milk(s) from other sources than parents for the high sugar and fats present and required to survive in harsher climates (cold) that we're not native to.

Milks, butters, and cheeses are a high value food source for people who burn massive amounts of calories to keep their bodies warm.