EPA & DHA
The two active long-chain omega-3 fatty acids in fish and algae oil.
EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are the two long-chain omega-3 fatty acids that fish, krill, and algae oil supplements provide. They are the numbers that matter on an omega-3 label — the total "fish oil" figure can be much larger than the combined EPA + DHA it actually delivers.
Because a 1000 mg fish-oil softgel might contain only 300 mg of EPA + DHA, the fair way to compare two omega-3 products is cost per gram of combined EPA + DHA, not cost per softgel or per gram of oil.