text: Formulation Fish oil supplements are available mainly as liquids or capsules. Most of these capsules are single-piece gel capsules or softgels. Also available are enteric-coated capsules that pass through the stomach before dissolving in the small intestine, thus helping prevent indigestion and "fish burps". Poorly manufactured enteric-coated products have the potential to release ingredients too early. ConsumerLab.com, a for-profit supplement testing company, reported that 1 of the 24 enteric-coated fish oil supplements it evaluated released ingredients prematurely. Fish oil products may use other techniques to hide the fishy taste. For example, added lemon or strawberry flavor tends to produce a more agreeable product and are usually present in fish oil gummies.
  EPA and DHA content
  Generally, oily fish have more EPA than DHA versus salmon which has more DHA than EPA. To illustrate the amounts of EPA and DHA in supplements, a softgel capsule containing fish oil derived from pollock might contain a total of 642 mg of total fish oil, of which 584 mg are omega-3 fatty acids, with 377 mg EPA and 158 mg DHA.3 That same company's salmon oil softgel contains 1008 mg of total fish oil, of which 295 mg are omega-3 fatty acids, with 95 mg EPA and 118 mg DHA.4