Triglobulin was a biogenic substance produced by the Axanar zymuth gland and released into the blood. It had certain similarities to Human lymphatic fluid. Triglobulin was used to produce medicines and vaccines, and was by some species used as an aphrodisiac.
In 2151, an unidentified starship attacked an Axanar cargo ship in order to harvest the crew's triglobulin. (ENT: "Fight or Flight")