Molecular distillation is a type of short-path vacuum distillation, characterized by an extremely low vacuum pressure, 0.01 torr or below, which is performed using a molecular still.

Are all fish oil molecularly distilled?

Bioavailability of marine n-3 fatty acid formulations. Prostaglandins Leukot Essent Fatty Acids 2010 Sep;83(3):137–141. Despite what you may have been told, all manufacturers use heat in the production of their fish oil supplements, as all oils must be cleaned, and all concentrated oils must be molecularly distilled.

Does molecular distillation harm fish oil?

When done correctly, molecular distillation is capable of reducing the toxins in fish oil to levels considered to be safe by the EPA and other agencies. Although almost any fish oil manufacturer will tell you their product is free of these toxins, independent lab analyses tell a different story.