Tip No.1: Only buy fish oil that you can verify its freshness and origin
The only way to find out if your fish oil capsules are truly fresh is to cut open a capsule and touch a drop to your tongue. If you experience a burning sensation then the oil is not fresh but rancid and any benefits will be unavailable. Rancid oil will not agree with your stomach and you will stop taking it because you won't be able to stand it!
Buy Fresh, small batched, highly potent, highly distilled All American Omega-3.