In this article, I will focus on the most suitable substances for leaving the body / astral travel. High affinity means a strong effect at a low dose of the substance.
NMDA antagonists are referred to as dissociative substances https://en.wikipedia.org/wiki/Dissociative
Substances that do not have euphoric effects with addictive potential https://www.ncbi.nlm.nih.gov/pubmed/27314670
Diphenidine, https://en.wikipedia.org/wiki/Diphenidine , http://psychonautwiki.org/wiki/Diphenidine
https://en.wikipedia.org/wiki/4-MeO-PCP positive higher affinity
https://en.wikipedia.org/wiki/Dexoxadrol
https://en.wikipedia.org/wiki/8A-PDHQ higher affinity is an advantage, more detailed research is lacking
https://en.wikipedia.org/wiki/Dexoxadrol developed by pharmaceutical companies as an analgesic, but the drug was discontinued due to side effects such as nightmares and hallucinations https://en.wikipedia.org/wiki/Etoxadrol developed by pharmaceutical companies as an analgesic, but the drug was discontinued due to side effects such as nightmares and hallucinations
https://en.wikipedia.org/wiki/NEFA_(drug) it seems that it has a very high affinity and that is very positive
https://en.wikipedia.org/wiki/Memantine is a drug designed to combat excitotoxicity in Alzheimer's and Parkinson's patients. The disadvantage is its excessively long duration of action.
HU-211: an enantiomer of the potent cannabinoid HU-210 which lacks cannabinoid effects and instead acts as a potent non-competitive NMDA antagonist. https://en.wikipedia.org/wiki/Dexanabinol
https://en.wikipedia.org/wiki/Rhynchophylline occurs in plants
https://en.wikipedia.org/wiki/Ibogaine is an interesting hallucinogen found in plants. The disadvantage is its hypothetical addictiveness; this substance acts on many receptors (including NMDA) and among them, opioid receptors. It also acts on the same receptors as Salvia divinorum, which is not very good: there is a certain risk of negative psychotic symptoms (of course, most people do not experience negative psychotic symptoms, but some may). The active substance is also found in plants in the Amazon rainforest.
These should be purely natural substances, their high affinity is an advantage https://en.wikipedia.org/wiki/7-Chlorokynurenic_acid high affinity is an advantage. Legally sold by companies on the internet by chemical companies. Psychoactive effects are listed. Unlike chemically similar substances, it is able to penetrate the brain https://en.wikipedia.org/wiki/Kynurenic_acid natural substances with huge affinity, but as far as I know it is not able to penetrate the brain https://en.wikipedia.org/wiki/4-Chlorokynurenine
http://www.abcam.com/7-chlorokynurenic-acid-ab120024.html
Substances chemically similar to the neurotransmitter NMDA act as NMDA antagonists. The psychoactive effects may be questionable; it would be necessary to search for whether anyone has experimented with it and what their experiences were. https://en.wikipedia.org/wiki/Midafotel https://en.wikipedia.org/wiki/APV_(drug)
Laws https://www.zakonyprolidi.cz/cs/2013-272 http://www.mzcr.cz/Legislativa/dokumenty/narizeni-vlady-c463/2013-sb-seznamech-navykovych-latek-_8597_2439_11.html http://www.zakonypreludi.sk/zz/1998-139 https://www.zakonyprolidi.cz/cs/2013-463