Well SWIM's cousin chico dorge did a STB tek on some young immature acacia Confusa root bark, 25gms yielding about 100mg of spice, and added that to about 100gm of 10xcaapi extract. It was effective. Not as wonderful as MHRB Yellow spice... but it was a nice clean good spice additive.
Dorge is cooperatively owned and cooperatively run by various hyperspacial entities working as a collabertive sentience project for the betterment of sentient exploration.
Offical Changa web sitehttp://changa.esotericpharma.org/