"1000mg fish oil" — why the front number is meaningless

"300mg fish oil" sounds like enough. It's the number on the front of half the pharmacy supplements in Malaysia. Almost every brand using that 300mg framing is doing one of two things — and you should know which before you keep buying.

What 300mg actually refers to

Depending on which brand:

• Best case: 300mg is the total EPA + DHA per capsule. This is meaningful but borderline. EFSA suggests 250mg combined daily as the floor for heart function benefit. 300mg per capsule, once daily, just clears that floor.
• Common case: 300mg is "omega-3" — which may include ALA from plant sources. Your body converts ALA to EPA/DHA at single-digit percentages. So "300mg omega-3" can mean 30mg actually usable EPA+DHA.
• Worst case: 300mg is just fish oil. Active EPA+DHA may be 90-150mg. You'd need 2-3 capsules to clear the EFSA floor.

The front of the label rarely tells you which interpretation applies. The back of the label sometimes does — if you know what to look for.

Why 300mg as a marketing number works so well

It sounds substantial without committing to anything specific. It's enough digits to look serious, not so many digits to require explanation. It's the price-point sweet spot of mass-market supplements.

It also conveniently sits at exactly the EFSA-approved floor — meaning brands using the number can imply approval without actually providing the dose your body uses.

How research-grade research actually dosed

Most observational and clinical studies on omega-3 used doses well above 300mg combined:

• General cardiovascular studies: 500-1000mg combined daily
• Cognitive function studies: 1000mg+ daily
• Clinical-grade interventions (under medical supervision): 2000-3000mg daily

If a brand is implying its 300mg gives you what "the studies" show — without specifying which studies, at what dose — that's a marketing implication, not a research claim.

What you should actually look for

1. EPA per capsule (in mg, on the back)
2. DHA per capsule (in mg, on the back)
3. Sum them. That's your usable dose per capsule.
4. Multiply by your daily intake to see total daily EPA+DHA
5. Compare to 500-1000mg daily for general benefit, 250mg minimum for EFSA's lowest threshold

If your daily intake adds up to less than 250mg, you're not even at the regulatory floor. If it's between 250-500mg, you're at maintenance. Above 500mg, you're in the range observational research uses.

The honest version of "300mg"

The honest brand version of a 300mg-front-label product would say: "Per capsule: EPA 180mg, DHA 120mg. Combined EPA + DHA = 300mg. Take 1-2 daily to meet general daily recommendations."

That sentence exists on perhaps 5% of bottles. The rest hide behind "fish oil 300mg" or "omega-3 300mg" and let your brain do the rest.

What to do tonight

Flip your fish oil bottle to the back. Find EPA and DHA per capsule. Add them together. Multiply by how many you take daily. If the answer is less than 500mg combined, you're underdosed — and the front of the label was misleading you.

The number on the front of your supplement is for marketing. The numbers on the back are for you. Which numbers have you been making decisions from?