Fish oil supplements have been touted as beneficial for the heart and eyes. But, a meta-analysis of 10 clinical trials with almost 78,000 participants showed that the fish oil caplets are of little benefit to patients with heart disease.
Another study, regarding dry eye disease, also concluded that fish oil supplements are not beneficial. This study compared fish oil supplements with olive oil supplements.
Evidence still supports the benefits of eating eight ounces of fish per week to reduce cardiovascular disease risks.
Sources: Tufts Health & Nutrition Letter, August 2018 and https://bit.ly/2AR9FVk