In fact, several studies suggest that fish oil can help ease period pain.
This article explains the benefits of fish oil for PCOS.
What Is Fish Oil?

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Reduce period pain:People with PCOS often experience severe period pain.
The use of omega-3 fatty acid supplementation may relieve menstrual cramps by reducing inflammation.
Omega-3 fatty acids may be so effective for these purposes that some experts recommend it as a PCOS treatment.
The American Heart Association recommends eating two servings of cold-water fish per week.
The current recommended daily intake for adult women is 1.1 grams.
Do not take fish oil supplements if you are allergic to fish.
Summary
Omega-3 fatty acids are known to improve mood and immunity and reduce inflammation.
Fish oil supplements may not be right for everyone, so talk to your healthcare provider first.
2022 Nov;21(5):14-18.
2023 Feb;25(2):131-136.
2019 Jan 3;380(1):23-32. doi:10.1056/NEJMoa1811403
American Heart Association.Fish and Omega-3 fatty acids.
National Institutes of Health Office of Dietary Supplements.Omega-3 fatty acids: Fact sheet for health professionals.
2017 Dec;16(1):131. doi:10.1186/s12944-017-0528-0