Got it on Amazon. Paid a little more than it's worth but not by much, and worth it to not have to go get it somewhere.
I inoculate bi-weekly in Veg and Ill do the same in flower.
I think you'll see some increased growth in veg but in flower, all I want this stuff to do is act as a root protectant. Playing with such a compact and dense root structure doesnt give a lot of wiggle room if something goes wrong.
And Mycos is good too but it's way more sensitive to nutrient concentrations and wont do much once P is over 60ppm. Trichoderma is a different animal and is largely antifungal, protecting against pythium and fusarium etc. But It also helps with transport and uptake of nutrients as well. I dont bother with
Mykos anymore. I'm all about Bacillis and trichoderma.