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There is strong evidence that the omega-3s EPA and DHA
can help lower triglycerides and blood pressure
When possible, try to get omega-3 fatty acids from foods such as fish rather than supplements. Other good food sources of ALA -- which is converted into omega-3 fatty acids in the body are walnuts ,flax and flaxseed oil ,olive oil and
soybean oil .
Consider a supplement like fish oil capsules or algae oil. Fish oil contains both EPA and DHA. Algae oil contains DHA and may be a good option for people who don't eat fish .recommended dose is 1 gram of DHA and EPA combined from fish oil daily .
hope this helps your father.take care!