Neither. It is an oil. An ester is produced from an organic acid and alcohol. Squalene is a natural organic compound originally obtained for commercial purposes primarily from shark liver oil, though there are botanic sources as well, including amaranth seed, rice bran, wheat germ, and olives. All higher organisms produce squalene, including humans. It is a hydrocarbon and a triterpene.

Flu vaccine contains squalene oil as an adjuvant. Squalene is not just a molecule found in a knee or elbow - it is found throughout the nervous system and the brain." When injected in the body, the immune system attacks it as an enemy to be eliminated.

For humans eating and digesting squalene isn't a problem. But injecting it "galvanize(s) the immune system into attacking it, which can produce self-destructive cross reactions against the same molecule in the places where it occurs naturally in the body - and where it is critical to the health of the nervous system." Once self-destruction begins, it doesn't stop as the body keeps making the molecule that the immune system is trained to attack and destroy. Matsumoto says "Squalene is a kind of trigger for (a) real biological weapon," what Soviet researchers called "a biological time bomb!!" He and Dr. Pam Asa conclude that "Oil adjuvants are the most insidious chemical weapon ever devised," including ones with squalene. So what American scientists conceived as a vaccine booster (or what's now being developed in labs) was another 'nano-bomb,' instigating chronic, unpredictable and debilitating disease. Using squalene in vaccines is outlandish and criminal. http://euro-med.dk/?p=9152