- Alkemists Pharmaceuticals (homepage, more info)
"An independent contract laboratory dedicated to: Natural Product Consulting, Quality Control, Research & Development Manufacturing"
- Cielo Ethnobotanicals (homepage, more info)
"With the highest quality and ethics in mind"
- Erowid (homepage, more info)
"Documenting the Complex Relationship between Humans and Psychoactives"
- Salvia divinorum Research and Information Center (homepage, more info)
The authoritative Salvia site, maintained by salvinorin pioneer Daniel Siebert.
- Xenopharmacophilia (homepage, more info)
- Miscellaneous URLs