Studies showed that fish oil with docosahexaenoic acid or DHA and eicosapentaenoic acid or EPA have the most health and benefits. Studies showed that the brain uses or needs more DHA to function better. Aside from being free of heavy metals, it should always contain at least 60 % of EPA and DHA. You would also have to consider or be cautious with vitamins like Vitamin A and E which can be very harmful in large doses.
How would you know that you are buying the safe fish oil supplement? Only buy from companies that use fresh and high qualify fish and inform the public where they get their fish. You can check their websites or labels to be informed properly.
Fish oil supplements can be either liquid or tablet. Liquid fish oil costs more than oil capsules. But when compared with capsules based on the cost-per-gram it is actually less expensive. Capsules are tamper-proof and keep the oil from getting bad. Most people find fish oil to be expensive or over priced. Some experts would say that there are two ways to compare prices. You can compare the total amount of DHA in the supplement and the cost for each gram of DHA.
You would feel that you have low quality fish oil if you suffer from any ache or pain. So, we would have to be cautious when buying low-cost fish oil. They may not be the same as the high-quality fish oil. You would have to be cautious when buying cheap fish oil.
So, when buying fish oil, or any kind of product, read the label or the product information first. Getting informed will relieve you of any kind of health risk in the future. Reading the label or getting to know the product would not be more than a couple of minutes, anyway. So, spare the time.