B1C

B1C is a cryoprotectant that the Alcor Life Extension Foundation used in vitrification in 2000–2001. B1C was developed by 21st Century Medicine. B1C was used only for neuropreservation patients. B1C was the first vitrification mixture that Alcor used, having replaced glycerol as a cryoprotectant. In 2001, B1C was replaced by the nearly-identical B2C, to reduce viscosity.