In the mid 1980s a group of people experimented with 2C-D specifically in regards to its effects on learning and cognition. Most of the test subjects were graduate students who were voluntarily taking 2C-D. Their results were recorded in the work Certain Exotic Transmitters as SMART PILLS or Compounds that Increase the Capacity for Mental Work in Humans A story about LAZAR as told by Hosteen Nez
Unfortunately, the body of research appears to end there. Wikipedia has mention to therapeutic studies of 2C-D in Germany under the name “LE-25”.
Caution: In the United States, 2C-D is potentially covered under the Federal Analog Act. Selling or purchasing 2C-D with the intent of human consumption is potentially punishable as a felony.
Einstein in a pill
This stuff is great! It's simply wonderful. 2C-D at low doses increased my memory and problem solving skills. It made me think of the abstract connections between topics and made whatever I learned make more sense. It makes learning more interesting. 2C-D at low doses stacks perfectly with low doses of 2C-I. 2C-I increased energy and confidence and has this synergy with the low dose 2C-D. I became smarter, and some of the enhancement stayed with me even after the low dose 2C-D wore off. Long term potentiation? I assume it's like while moderate to extreme levels causes hallucinations, mild activation of 5HT2a increases cognition. It's like creativity and insight fused with high intelligence. Like a web of learning.