Omega-3 supplements usually have fairly large pills, generally measuring half an inch to an inch. For some, that poses a problem. GNC offers an alternative with its soft fish oil mini-capsules. GNC Triple Strength Mini Fish Oil wins the award for the best overall omega-3 supplement for its size and concentration of omega-3.GNC's Mini Triple Strength fish oil has a good concentration of omega-3 EPA (734 mg) and DHA (266 mg).