..a distinct increase in vitamin and mineral uptake / production, which if there are more minerals being allowed to be absorbed, it could increase potency for sure, especially if supplying Fe and Mg in the same time frame or near..
It could perhaps be likened to humans how if we take in curcumin and pepper for it allows us to absorb more antioxidants..
plus there is a distinct smell that arises that is very dank, for lack of a better word, and a pungency of the smell, that can cause problems for those who have jobs.. My family cannot smoke my sulphur organics on a Sunday and go to work on a Monday without it smelling everywhere like you have a dank quarter in your pocket at church.. even though the ganja is at home and wasn't smoked that day, it can be that strong, especially off strains that are skunky or kushy. Can also make fruitier strains smell danker and sativas smell like pungent Kush at certain distances..
but also, don't grace em too late or it will do the opposite, and dry the greasiness (terps) right off the plant.
Day 7-10 of flower is my recommended max. Once there are clusters of 'pistils' stop and if you spray pistils, wash em off after. But try do two foliars between the flip and the first week or so
As for using Langbeinite, its basically Epsom with K added, so if you try it, just go really easy and test a tomato seedling if you can first. And let me know how it goes if you don't mind.
When foliaring with epsom, just using 1/8th a tsp per gallon too by the way. That's the MED principle at play.
Minimum Effective Dose.