I use it on my tomatoes, and get impressive results. Made from fish byproducts during the processing. Loaded with nitrogen and kelp. Only downside is the fishy smell.
I'm surprised I don't hear more about it the for marijuana?
Indoors or outdoors?
Be advised, it works, but it smells. If outdoors it attracts animals. If indoors, it just plain smells, so you'll need a carbon filter or window vent.
BTW, tomatoes love it.