Bio-restorative formula

The  is a fictional item featured in comic books published by DC Comics. It is considered part of DC's Pre-Crisis Earth-One continuity, though it's existence and background have been preserved in the rebooted internal reality which existed following the 1985-86 maxi-series Crisis on Infinite Earths. The item first appeared in Swamp Thing, Volume 1 #1 in November, 1972.

The Bio-restorative formula was a chemical compound developed by the husband and wife team of Doctors Alec and Linda Holland. It's purpose was to promote vegetative growth in what would otherwise be inhospitable environments. Although Alec did the lion's share of the research and most of the credit is attributed to him, it was actually Linda who made most of the breakthrough discoveries concerning the process. The project was financed by the United States' Defense Department Intelligence, who assigned government agent Matthew Cable to serve as liaison and bodyguard to the Hollands. They set them up in a private laboratory (which was actually a refurbished barn) in the middle of the Louisiana bayou.