McCoy surmises that Chekov's increased adrenaline levels may have had some effect, and recalls that adrenaline had once shown promise as a treatment for radiation sickness. Mr. Spock and Dr. Wallace, assisted by Nurse Chapel, begin work on an adrenaline-based compound to test on the landing party.
https://en.wikipedia.org/wiki/The_Deadly_Years
"The Deadly Years" is the twelfth episode of the second season of the American science fiction television series, Star Trek. Written by David P. Harmon and directed by Joseph Pevney, it was first broadcast December 8, 1967.
In the episode, strange radiation causes members of the crew of the Enterprise to age rapidly.
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