Fish oil

Fish oil is derived from the tissues of oily fish and contains omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).

Some animal studies have found that fish oil increases dopamine, which may be low in CFS patients.

Vegetarian and vegan alternatives
The nutrients in fish oil including EPA and DHA, are also found in Omega 3 or essential fatty acids derived from flaxseed oil, starflower oil or omega-3 derived from algae, these have the additional advantage of avoiding heavy metal contaminations that can accumulate in the fat stores of fish.