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Cold is a immune system response, immune system throwing out unwanted and dangerous particles through mucous, sneezes, and watery discharge through nose and moth. The mucous consists of mainly white blood cells and sticky matter used to entrap dust particles...

There may be many causes for high blood pressure, and it is advisable to treat the cause, not simply the symptoms.  The omega 3 oils are not going to "hurt you" but they may not be sufficient to address the underlying cause of your hypertension...