Legality varies greatly by jurisdiction and individual psychedelic compound in question, so we're hesitant to provide sourcing information in a public forum. We'd recommend checking the legal status of the compounds that you are interested in in your given city/province. For example, many jurisdictions have licensed ketamine-assisted psychotherapy clinics, so you can have a safe, supervised experience if you are seeking psychedelics for purposes of clinical treatment.

For most folks, however, psychedelic access is largely restricted to either growing/making your own (complex and again, legally fraught) or accessing black/gray market sources. We created a brief harm reduction guide for Dealing With Your Dealer to minimize the likelihood of getting something other than what you were looking for (and maybe causing harm to yourself or community members as a result): https://www.psychedelicsafetyalliance.org/f/dealingwithyourdealer

Start asking. Be aware that it's not a buyers market, and that testing your substances is as simple as ordering a kit from Amazon