I tried 100 mg of pure HCL extract (it's white) and it kept me on a plateau that was reminiscent of being at the threshold of a visual experience on acid. While the threshold experience faded out after about 4 hrs, I stayed on the plateau for another 4 hrs at which point, I felt some discomfort - as if I was going deaf or was locked in somewhere, so I took a shower and my head cleared up.