Are there any long term studies comparing the availability of triglyceride vs. ethyl eater forms of EPA/DHA?

Yes! The DHA/EPA Institue was fortunate to be present at the recent ISSFAL meetings in Maastricht , The Netherlands. At that meeting, a German research group reported on the largest and longest (6 months in duration) clinical trial wherein equal intakes of EPA/DHA were provided daily as TG (triglyceride) or EE (ethyl ester) forms. Omega-3 levels in the red blood cells were found to rise by approximately 15 % more with the TG as compared to the EE form.