There are different products if you don't make your own. Some come charged, others come inoculated, and at least one comes just plain ol char.
You could also make the soil in the mix with the bio char just stronger and let it cook. It acts like a sponge, and a habitat for micro-organisms. So treat it as such.
Only here to discuss cultivation theory, check out genetics and their reviews, technology for this trade, and cannabis politics. Not currently partaking in any cannabis pleasure other than discussions.