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Flaxseed and Other Popular Seed Oil Supplements Tested by, But Not All Brands Pass

— Flaxseed, Black Currant, Borage and Evening Primrose Oils with ALA or GLA Reviewed —
White Plains, New York, May 7, 2014 — Plant seed oils are popular supplements that provide omega-3 and omega-6 fatty acids, but which products offer the best value and quality? Recent analyses by found that only 14 of 16 products selected for testing contained what was stated on the labels. One supplement was found to completely lack the omega-6 fatty acid GLA (gamma-linolenic acid), indicating that it didn't contain a plant oil it promised. Another product mislabeled its amount of oleic acid, an omega-9 fatty acid.

Flaxseed oil is rich in the omega-3 fatty acid ALA (alpha-linolenic acid).  Black currant, borage, and evening primrose oils are good sources of the omega-6 fatty acid GLA (gamma-linolenic acid). Supplements containing these oils are used in treating a variety of inflammatory diseases and other conditions.

In addition to testing each product for omega-3 and -6 fatty acids, tested for freshness and potential heavy metal contamination (lead, arsenic, and cadmium). found that, among top-quality products, a consumer could obtain 200 mg of GLA for as little as 11 cents and 500 mg of ALA for just 2 cents.

Test results and comparisons of the 16 products selected by for testing, as well as for 10 supplements which passed the same testing through's voluntary Quality Certification Program, are provided in a new report online at The report, which includes information about the uses, dosage, and potential side-effects of these seed oil supplements, covers the following products, including two products for pets and two products similar to one which passed testing:
  • Barlean's Omega Twin
  • Carlson Golden Primrose
  • CVS/pharmacy Flaxseed Oil
  • Finest Nutrition (Walgreens) Flaxseed Oil
  • HALO Purely For Pets Dream Coat
  • Health from the Sun Organic Evening Primrose Oil
  • Jarrow Formulas Borage GLA-240
  • Life Extension Mega GLA with Sesame Lignans
  • Nature Made Flaxseed Oil
  • Nature's Bounty Evening Primrose Oil
  • Nature's Sunshine Evening Primrose Oil
  • Nature's Way EfaGold Borage
  • NOW Evening Primrose Oil
  • NutriCology GLA Borage Oil
  • Optimum Nutrition Flaxseed Oil
  • PetNaturals of Vermont Daily Best for Dogs
  • Puritan's Pride Natural Flax Oil
  • Rexall Flaxseed Oil
  • Rite Aid Omega 3-6-9
  • ScienceBased Health HydroEye
  • Simply Right (Sam's Club) Flaxseed Oil
  • Solgar Evening Primrose Oil
  • Spectrum Essentials Borage Oil
  • Spring Valley (Walmart) Flaxseed Oil
  • Standard Process Linum B6
  • Vitacost Flaxseed Oil
  • Vitamin Shoppe Flax Seed Oil
  • Vitamin World Flax Oil is a leading provider of consumer information and independent evaluations of products that affect health and nutrition. Membership to is available online, providing immediate access to independent reviews of more than 1,000 products. The company is privately held and based in Westchester, New York. It has no ownership from, or interest in, companies that manufacture, distribute, or sell consumer products. is affiliated with, an evaluator of online pharmacies, and, which reviews and rates Medicare Part D plans.

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