Besides Hemp, there are only a small number of foods that contain GLA. While the body has the ability to convert Linoleic Acid (an abundant Omega 6 found in foods) into GLA, most of us are not making this conversion effectively, or are missing out on the conversion all together. Due to various factors such as stress, alcohol, low levels of vitamins and minerals, intake of poor quality Omega-6; and certain health conditions, the conversion is not made effectively.
Even if one did get unrefined Sunflower Oil and mixed it with unrefined Flax Seed Oil, you would mimic Hemp Seed Oil's Omega 6 to 3 ratio, but still be missing their direct higher metabolites. With Hemp however, GLA is a readily available form, no conversion needed.
Lastly it is a question of taste and convenience. If you are eating a good supply of unrefined Sunflower or Safflower oil then Flax or Fish oil may be the optimum choice to balance your Omega 6 to Omega 3 ratio. But wouldn’t it be easier to get both your Omega’s at the same time? Often Flax Seed Oil and Fish Oil consumers become tired of its taste, or have concerns over toxic contaminants in fish oil, for these people, the pleasant nutty flavour of new hemisphere ™Hemp Seed Oil is a welcome change.