A quick quiz:
How much omega-3 fatty acids, EPA + DHA, are in each capsule of fish oil with the composition shown on the label below:
If you said 1340 mg (894 mg + 446 mg), sorry, but you're wrong. There are 670 mg EPA + DHA per capsule.
Did you notice that the composition, or "Supplement Facts," lists the contents of two capsules ? Rather than the usual one capsule contents, this product label lists two capsules.
I don't know why some manufacturers or distributors do this. However, I have seen many people tripped up by this kind of labeling, taking half the omega-3 fatty acids they thought they were taking. This can be important when you are trying to obtain a specific dose of EPA + DHA to reduce triglycerides, reduce Lp(a), control abnormal heart rhythms, reduce bipolar mood swings, or other important effects.
I liken this to pulling up to a gas station where the sign says gasoline for $1.25. Wow! Can't beat that! You then find out that it's really $1.25 for a half-gallon, or $2.50 a gallon.
In truth, the labeling is accurate; it's just very easy to not notice the two capsule composition.