Hello TakesOneToKnowOne,
Welcome to the Nexus. As I understand it, MHRB is not scheduled, but since it is a plant containing DMT, an aggressive prosecutor could pursue it under the 1986 Analogue act.
The Suppliers section is big. It takes over an hour to review the whole thing. This is an hour that is well worth spending reading on the Nexus.
If you have questions about whether a specific post may cross a rules line, just run it by one of the official moderators of the site. I'm sure they'll be happy to let you know and in a prompt manner. I honesty suspect it is okay for you to just make a post in the Open Discussion section - you could reference the supplier in the title. For example if I wanted to post on a Supplier called ABC Botanicals and couldn't yet post in Suppliers, I'd go to Open Discussion, and head a post "Regarding the Quality of MHRB from ABC Botanicals," or something similar.
If you get a chance and might be willing to tell us a bit more about yourself, your history with psychedelics, exposure to DMT, etc., I'm sure it would be welcomed. Please take a look around. There's a huge wealth of resources here. Questions are good. Keep posting them.
Again, welcome to the Nexus.
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