A trial including 130 people with ocular rosacea found supplementation with omega-3 fatty acids (720 mg EPA + 480 mg DHA daily) was effective in reducing symptoms of dry eye (itching, burning, blurred vision, gritty sensation) compared to an olive oil placebo. The effects were notable after 3 to 6 months of supplementation.[1] Further research is needed to strengthen these findings.
Two small trials have assessed the effectiveness of zinc supplementation in rosacea. While one trial found symptom improvements over three months of supplementation, another trial found no improvements compared to placebo.[2][3] Currently, more evidence is needed to support the use of zinc for rosacea.