I started taking GLA for arthritis and found myself losing some deep, lower belly fat. It stimulated noticeable hair growth.

Then I found this article:

Since the 1980s, many studies have focused on the power of GLA, or gamma linoleic acid, to serve as a natural aid to weight loss. Found naturally in seed oils, such as borage, evening primrose, and black currant seed oils, GLA is an essential fatty acid, which triggers fat burning instead of fat storage by boosting the metabolism in two ways: First, it fuels the burning of brown adipose tissue, a type of fat commonly dormant in overweight people. Second, it stimulates a metabolic process commonly referred to as the “sodium pump,” helping to use up nearly half of the body’s calories.

http://www.annlouise.com/blog/2011/05/19/gla-the-good-omega-6-that-flushes-fat/

and this article:

Gamma-linolenic acid (GLA) is an omega-6 fatty acid that is found mostly in plant based oils such as borrage seed oil, evening primrose oil, and black currant seed oil. Omega-6 fatty acids are considered essential fatty acids: They are necessary for human health, but the body can’t make them -- you have to get them through food. Along with omega-3 fatty acids, omega-6 fatty acids play a crucial role in brain function, as well as normal growth and development. Also known as polyunsaturated fatty acids (PUFAs), they help stimulate skin and hair growth, maintain bone health, regulate metabolism, and maintain the reproductive system.

Source: Gamma-linolenic acid | University of Maryland Medical Center http://umm.edu/health/medical/altmed/supplement/gammalinolenic-acid#ixzz3EUpXL1mM
University of Maryland Medical Center
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Diabetic neuropathy

Some studies show that taking gamma linolenic acid (GLA) for 6 months or more may reduce symptoms of nerve pain in people with diabetic neuropathy. People who have good blood sugar control may find GLA more effective than those with poor blood sugar control.

High blood pressure (Hypertension)

There is some preliminary evidence that GLA may help reduce high blood pressure, either alone or in combination with the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), found in fish oil. In one study, men with borderline high blood pressure who took 6g of blackcurrant oil had a reduction in diastolic blood pressure compared to those who took placebo.

Another study examined people with intermittent claudication, pain in the legs while walking that is caused by blockages in the blood vessels. Those who took GLA combined with EPA had a reduction in systolic blood pressure compared to those who took placebo.

More research is needed to see whether GLA is truly effective for hypertension.

Source: Gamma-linolenic acid | University of Maryland Medical Center http://umm.edu/health/medical/altmed/supplement/gammalinolenic-acid#ixzz3EUp9bwVc
University of Maryland Medical Center
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http://umm.edu/health/medical/altmed/supplement/gammalinolenic-acid

Source: Gamma-linolenic acid | University of Maryland Medical Center http://umm.edu/health/medical/altmed/supplement/gammalinolenic-acid#ixzz3EUoIwGFg
University of Maryland Medical Center
Follow us: @UMMC on Twitter | MedCenter on Facebook