| "I once thought I could save the world... now look at it"
— Spoilers for Deus Ex: Mankind Divided follow!
It is unclear how Neon came around, but by 2029, the Dvali are the sole manufacturers of the drug, using a chemical lab in the sewers to create it, then using approved dealers, like Bonbon, to sell it on the street. However, someone named Harmony is going behind the Dvali's back and smuggling some out of the lab to another dealer named Cygnus to sell Neon.
Many associate rainbows with Neon, suggesting it may make its users see an array of bright colors. This is further hinted in marketing: the gray applicator has a rainbow colored circle on it, the wrapper with a drawing of a rainbow, and Cygnus uses a rainbow swan as their logo (though hidden under the guise of being a cleaning company).
While not much is known about any affects caused by the drug, it does have one lethal downside: it will kill any augmented person that takes it. The reason for this is that the chemicals used in Neon have an adverse reaction to Neuropozyne. While word of this gets around, it appears this is not common knowledge as those oblivious to this will become upset on seeing an Aug die from taking Neon while another onlooker who knew will calmly explain to them why it happened.
- Adam Jensen can disrupt the production on Neon by doing the side mission, Neon Nights.
- It is possible that, because Jensen does not take Neuropozyne, he could be the only augmented person that could take Neon without any adverse effects.
- Vlasta Novák and Vincent Black (posing under the name Czarnobog) are the Dvali members responsible for handling Neon production and selling it.
- In the ending, Eliza Cassan will comment that Neon is more or less illegal because of its criminal ties, rather than causing any health concerns. She will also note some think Neon has therapeutic qualities and, with testing, a legal form could become available later on.