Since EPA is the more researched fraction in regard to cancer, a supplement that contains a 1.5 ratio or higher might be a good bet. GLA is available in supplement form as evening primrose oil, borage oil, or blackcurrant seed oil. A good dose might be 500mg to 2 grams. Oil capsules are made of gelatin and may not be appropriate for those who eat no animal products. Oils can be unstable and affected by light, and therefore should be stored in a tightly closed dark-tinted glass or opaque plastic bottle.
Refrigeration is recommended to prevent the oils from becoming rancid.
Also, children, pregnant women, and diabetics should be monitored by a physician when taking these supplements. Side effects may include mild nausea and diarrhea, bad breath, a general fishy smell, and possible nosebleeds and easy bleeding. GLA in supplement form is also not appropriate for hemophiliacs, those who take Coumadin, or before and after surgery. Otherwise, GLA appears to have no adverse reactions or drug or herbal interactions. Flaxseed meal is a very versatile additive to many foodstuffs.