The Red Pill and Alchemy

'The third and last phase is characterized by the color red. When the White stone or the White Elixir has been made, it needs to purified further, sublimated, until the Matter becomes totally Fixed and is completely stable. Then we have the Red Sulfur, the red stone, the Red Elixir, the Stone of the Wise.
When the divine light has emerged during meditation, one needs to make it last. this demands a continued effort of holding one's attention to this pure awareness, not only for the length of the meditation session, but also during every day life. At a certain point the pure awareness of one's divine self will be permanent.' Source

It's hard not to suppose that the original Matrix movie pill choice scheme was not directly inspired by the final stage of the alchemical process.