Psilosynine
- Betazoid neurotransmitter (SGR Novel: The Valiant; TNG: "Dark Page")
- Key component in telepathic abilities (SGR Novel: The Valiant)
- Federation science first capable of synthesizing it c.2333 (SGR Novel: The Valiant)
- Method developed by Turan Relanios, implemented by Carter Greyhorse (SGR Novel: The Valiant)
- Carefully controlled introduction to the bodies of some non-Betazoid telepathic species can enhance telepathic and telekinetic abilities significantly for a brief period (SGR Novel: The Valiant)