Yes, another of my tedious, “I’ve heard. . ./Is it true or not?” posts. 
I’ve read that supplementing with a natural, unsulphered molasses is good – but only good for organic soils with livings stuff in it versus what I use, which is basic potting soil + a handful of Nectar of the Gods granules + tons of perlite + a few cups of sand. (Like me, stupid simple and relatively cheap.)
Also, I’ve read that it is typically used during flower/tail end of flower.
(My working quasi-assumption is that it should be good in almost all soil applications, not just the “living soil” types. . .but for reasons I couldn’t explain scientifically. Something in my head about sugar/carb-feeding of any life, even mycelium er, mycelia (?) is a good thing for the plant and flower.)