Effect of evening primrose oil on gastric ulceration and secretion induced by various ulcerogenic and necrotizing agents in rats.
In the trial where women took an evening primrose oil capsule orally three times a day for a week, the dosage was 500 mg per capsule.
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It's best to consult your healthcare provider before taking evening primrose oil to determine what dose — if any — is safe.
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The most comprehensive evaluation is that evening primrose taken orally doesn't effectively relieve the signs and symptoms of eczema.