How long dose is take for omega 3 to start working?

Varies on dose & . Diet. Just as takes time for cholesterol to build up, takes time for omega-3 to help lower blood lipids. Generally at least 2-3 grams (2000-3000 mg) per day are needed to be effective. Enteric-coated caps help prevent "fish burp". Diet of good fats (polyunsaturated, no trans or saturated) & low glycemic index carbs added to lean protein, fruits & veggies help. Exercise is beneficial, too.