Science

The Omega-3 Truth: What Women Over 50 Need to Know

By Kim Fisher · February 2025, updated November 2026 · 6 min read

Let me make this simple.

Omega-3s get sold as the answer to everything from brain fog to joint pain. The real research is quieter than the marketing, and a lot more useful. Here's what I want every woman over 50 to know before she buys another bottle.

What do EPA and DHA actually do?

EPA and DHA are the long-chain omega-3 fats found mostly in seafood. DHA is a building block of the brain and the eyes. Both are part of how your body manages inflammation and heart rhythm.

Flax, chia and walnuts give you a different omega-3 called ALA. They're good foods. Yet the body converts only a limited share of ALA into EPA, and even less into DHA, which is why plant sources alone rarely move the needle.

Do omega-3 supplements protect your heart?

This is where the honest answer matters most.

The VITAL trial, published in the New England Journal of Medicine in 2019, gave 25,871 healthy adults (women 55 and older, men 50 and older) either 1 gram of marine omega-3s a day or a placebo, for a median of 5.3 years. The combined rate of heart attack, stroke and cardiovascular death was not significantly lower with the supplement.

One secondary result stood out: heart attacks on their own were 28 percent lower in the omega-3 group. There was no excess bleeding.

Honest framing: a secondary result is a lead worth following, not proof. The main answer from VITAL is that a daily gram of fish oil is not a shield for healthy people at average risk.

You'll also see claims about hot flashes, mood and brain fog in midlife. The evidence there is mixed, so I don't lean on it.

Is more omega-3 better?

Not automatically. A 2021 meta-analysis in Circulation pooled seven large trials and 81,210 people. Omega-3 supplements were linked to a 25 percent higher risk of atrial fibrillation, an irregular heart rhythm, and the risk was higher in trials using more than 1 gram a day.

Higher prescription doses do have a real job. At 4 grams a day they lower very high triglycerides by 30 percent or more, which is why that decision belongs with your doctor, not a store shelf.

How do I know if I need more?

Test it. The omega-3 index measures EPA and DHA as a share of the fats in your red blood cells. In the research that introduced it, an index of 8 percent or higher was linked with the lowest risk of dying from heart disease, and 4 percent or lower with the highest.

You can ask your doctor about it or use a finger-prick kit at home. Retest a few months after you change anything, because red blood cells turn over slowly.

Five things to do this month

• Eat fatty fish once or twice a week. Salmon, sardines, mackerel, trout or herring, about 3.5 to 4 ounces a serving. That's the American Heart Association's suggestion, and it's the best place to start.
• Read the label for EPA plus DHA. "1,000 mg fish oil" can mean 300 mg of the omega-3s you actually want. Add the two numbers.
• Take it with a meal that has some fat in it. In one small study, absorption of the common ethyl-ester form roughly tripled when it was taken with a higher-fat meal.
• Stay at or under 1 gram a day unless your doctor says otherwise. Especially if you take a blood thinner or have a heart rhythm condition.
• If you don't eat fish, choose an algae-based supplement. It supplies DHA directly, and many also contain EPA.

What I do for omega-3s

I’ll be honest: I don’t eat much fish. So I take an omega-3 supplement to cover the gap. For me, it’s a bridge for what isn’t on my plate.

I don't need more bottles. I need better information. Today I give my body what it's missing and let the numbers guide the rest.

Frequently asked questions

How much omega-3 does a woman over 50 need?

For most women, one to two servings of fatty fish a week is the starting point the American Heart Association suggests. Supplement doses above 1 gram a day are best decided with your doctor, because higher doses have been linked to a higher risk of atrial fibrillation.

Is fish oil safe if I take a blood thinner?

Talk with your doctor before you start. In the VITAL trial, 1 gram a day did not cause excess bleeding in healthy adults, yet that tells you nothing about how omega-3s interact with your specific medicines.

What is an omega-3 index test?

It measures EPA and DHA as a percentage of the fats in your red blood cells. Research links an index of 8 percent or higher with the lowest risk of dying from heart disease, and 4 percent or lower with the highest.

Are flax and chia seeds enough omega-3?

They are good foods, yet they provide ALA, and the body converts only a limited amount of ALA into EPA and even less into DHA. If you don't eat fish, an algae-based supplement supplies DHA directly.

If this landed

This isn't about doing more. It's about doing what works, and knowing why.

I see you. I've got you. You're not behind.

With love,
Kim