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Part of the plant used: seeds (oil)
Evening primrose oil contains essential fatty acids: gamma linoleic acid (GLA) and linoleic acid. GLA appears to inhibit production of inflammatory metabolites. Low levels of GLA are associated with some diseases.
The body can naturally produce small quantities of gamma linoleic acid. Taking GLA supplements can significantly increase blood levels.
Evening primrose oil is usually available in oral capsules standardized to 8% GLA.
It is administer 2 or 3 times daily with meals and use should last at least 3 to 6 months.
Children less than 12 years of age: 160 to 320 mg of GLA
Adult: 160 to 640 mg daily.
Used doses: 240 to 540 mg of GLA daily for at least 6 to 12 months before results are observed.
There is insufficient reliable information to conclude that evening primrose is effective in any other indication.
In 2004, Canada adopted new regulations that control the manufacturing, packaging, labeling and importing of natural health products. The new regulations also include an adverse reaction reporting system. Products that conform to the regulation's criteria are identified with a natural product number (NPN) and can be legally sold in Canada. This number indicates that the product meets specific criteria for safety and purity, not that it is effective for any indication.
Medicinal plant contents vary naturally from plant to plant - just as fruits from the same package may vary in taste and texture. There is no standard to measure the active content of each plant. Thus, efficacy of natural products should be expected to vary from brand to brand as well as from bottle to bottle of the same brand.
For more information about the Natural Health Products Regulations, or to check if a product has been assessed, visit the Health Canada website at www.hc-sc.gc.ca/dhp-mps/prodnatur/index-eng.php.
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The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.