2,5-dimethoxy-4-methyl-phenethylamine also called 2C-D, is a fascinating compound which displays effects similar to those mentioned by the original poster. However, this compound is not considered a supplement and is not available as it had been (unjustly) scheduled as a psychedelic analogue, but the effects are fascinating regardless. Below are some excerpts from Darrell lemaire's work with 2C-D
https://erowid.org/chemicals/2cd/2cd_smartpills1.shtml
2CD
* John: Graduate student in chemistry on Ph.D. track.
Having heard of the smart pills from Carl, John wanted to use some for his German studies. He was already auditing some of the first semesters and when he took the fourth semester he used smart pills for pre-exam studies and received an "A" in the course. He got a copy of Carl's short dictionary of German chemical terms and completed his language requirements. John felt that the use of smart pills was of great value in studying for the German and also for the cumulative exams which cover all of the chemistry which the professors feel the student should know. However, after that time, the Chemistry Department decided to plug the loophole and required students to take all four semesters of German.
2CD
* Bea: Degree in music, but not a professional musician.
She fully enjoyed music and toyed around with composing for her own pleasure. One evening while on a smart pill, she wanted to hear a certain song by one of the popular artists. She went over to the large shelf of LPs, and without even looking, pulled out the one she wanted. She started it playing and went over to the piano and played right along with the music. Since she could only play by sight reading sheet music prior to this event she was quite surprised. She played several other pieces by ear that same evening and had no problem playing by ear from then on.
2CD
* Steven: University professor, age 65.
I ingested 10 mg before approaching a new project. At a conference last year an overseas friend and I co-chaired a symposium. It received such positive feedback that she suggested we co-edit a book on the topic. So my project was to write a proposal to send to prospective publishers. The writing was surprisingly fluid. I had innovative ideas that I had not conceptualized previously. I worked on my word processor, and the next day found that I had to do very little editing before sending the book proposal to four publishers, one of whom recently accepted it. Good material for creative thinking and writing.
2CD
* Meg: Medical student.
She felt that the 10 mg regular starting dose was too much for studying, and seemed to act as a intensifier of sexual sensations. While making love on the material she felt wonderfully sexy and had very intense orgasms. One half a tablet (5 mg) was just about right on most occasions for reading and studying. She reported a pleasant, controlled energy and studied because she felt like it and had very good results from the effort. A follow up discussion ten years later disclosed that she felt the use of 2CD had increased the acuity of her hearing and that now ten years later there was no diminishing in that effect. For most of Meg's studies she used 2CD-DiEt, a compound which had fewer distracting components to it for her particular physiology (more on her use of this compound later under its own listing).
