Most fish oil supplements are either available in Ethyl Ester form or the Triglyceride form. Structurally, the major difference between the two forms is that in Ethyl Ester, the fatty acids (EPA & DHA) are esterified to an ethanol backbone, while in TG, the fatty acids are esterified to a glycerol alcohol backbone. Until recently, our Triple Strength Omega-3 Gold product featured omega-3 fatty acids in the ethyl ester form.