If you're looking for legal side of things definitely seek a attorneys help you can use a google search to find free websites with experienced and newer students of law, who will help you out!
But best suggestion again I'm not an attorney and am not giving legal advise, simply look up each individual items scheduling or analogue situation make sure extract or preparation for consumption is noted or noted not for human consumption in some cases. Also give info on the substance if you're planning on selling do not skip steps as a word of advice a lot of people buy things on a whim without much research don't specifically tell them how to use something to get
"high" but warn of
"dangers" inconspicuously like "Could cause nausea, dizziness, confusion, hallucinations(maybe not?) etc you get the point", this can easily be added to a label of whatever you are providing.
Just my opinion based on what I read and understood of your question hope this helps!
EDIT: Also I would suggest a symptom sheet and alleviation of unwanted symptom idea if the supplements and things are good to sell legally but may have negative side effects.
Understand: Nature knows no EVIL, Nature knows no GOOD, people know these things, because we perceive these things, with the gift of senses given to us at birth. A good or bad experience is simply a bridge to a another existential time frame, so always live in the moment and make every one a positive moment!
Any and all posts or interactions are to be held as my fictional writings/short stories or dreams. I may even have some delirium setting in, I've never been tested for it. The only exception to this is the statement about nature above, I feel this is a fact!