SuperThrive is mainly horticultural vitamin B-1, which is mainly used to reduce transplant shock and promote root growth.
Out in my neck of the woods, Thrive Alive is cheaper than SuperThrive.
I don't like SuperThrive because they state that they add secret hormones to it.
I don't want any secret hormones, thanks. What if I grow tits?
On second thought, it would mean more fun in the shower.
Anyway, I keep some Thrive Alive around and I use it on rare occasions.
It shouldn't be used during flowering.
Btw, if you want to really cut expenses, get a bottle of straight horticultural vitamin B-1, it's MUCH less than SuperThrive of Thrive Alive.