Omega-3: benefits for women, fertility and perinatal

Omega-3: what exactly are we talking about?

Omega-3 is essential fatty acids. This word “essentials” has a very specific meaning here: your body cannot make them itself. It is therefore essential to provide them through food — or through appropriate supplementation.

There are three main forms:

• THE ALA (alpha linolenic acid): of vegetable origin, found in flaxseeds, walnuts, rapeseed oil
• THE EPA (eicosapentaenoic acid): of marine origin, very anti-inflammatory
• DHA (docosahexaenoic acid): also of marine origin, essential for brain function and the fluidity of cell membranes

⚠️ Vegetable ALA is very poorly converted to EPA and DHA in the body. Eating nuts is good — but it's not enough if you're aiming for a real impact on fertility.

What is the purpose of omega-3 in your body really?

You've often been told “good for the brain.” It is true. But that's just the tip of the iceberg. Omega-3 plays two roles that are much less well known — and yet fundamental.

1. They are powerfully anti-inflammatory

Chronic low-grade inflammation is now recognized as an aggravating factor in many women's problems: endometriosis, PCOS, cycle disorders, difficulties in conceiving. Omega-3 — EPA in the lead — comes directly counterbalance this inflammation at the cellular level.

Concretely, they inhibit the production of pro-inflammatory prostaglandins, these chemical messengers responsible in particular for severe period pain. If you suffer from dysmenorrhea, getting enough EPA can make a real difference in the quality of your cycles.

2. They ensure the membrane fluidity of your cells

Imagine any cell in your body — muscular, cardiac, ovarian. Its wall, called the cell membrane, is a double layer of lipids (literally fat). And for that membrane to work well—that is, for nutrients to come in, for waste to come out, for hormonal signals to pass—it must be soft and fluid.

It is omega-3 that guarantees this fluidity.

Without enough omega-3, your cell membranes become rigid. Exchanges are less smooth. Hormonal signals pass less efficiently from one point to another. And in the context of fertility, this is not a detail.

Omega-3 and fertility: a direct and underestimated link

Whether you are in a natural preconception, on the ART journey, or simply looking to optimize your reproductive health, omega-3 deserves special attention.

Oocyte quality

The membrane of your oocytes is also a double lipid layer. The more it is rich in DHA, the more fluid and receptive it is, and able to respond correctly to maturation signals. Studies have shown that adequate DHA intake is associated with better oocyte quality — a determining factor, whether for a natural conception or in the context of IVF.

Endometrial receptivity

For an embryo to implant, the endometrium must be in optimal condition. Omega-3 contributes to regulation of the uterine environment by modulating local inflammation and by promoting good vascularization of the mucosa. In particular in the assisted reproduction process, this is a point that is increasingly taken into account by medical teams.

PCOS and endometriosis

These two pathologies, which affect one in ten women, are both characterized by a disturbed inflammatory and/or hormonal background. Omega-3, through their anti-inflammatory action, is one of the most documented nutritional adjustments to support these pathways — in addition to medical follow-up, never instead.

Omega-3 is no substitute for treatment. But they are among the nutritional levers that can support your body from within — and that counts.

Omega-3 during pregnancy and breastfeeding

During pregnancy, the need for DHA increases significantly. And for good reason: the fetal brain is largely built from DHA, especially during third quarter and the first few months of life.

What the research shows:

• Adequate DHA intake during pregnancy is associated with a better cognitive development Of the baby
• Omega-3 contributes to reduce the risk of preterm birth
• During breastfeeding, DHA is passed on to the infant via breast milk — an adequate maternal intake is therefore crucial

The ANSES (National Agency for Health Security) recommends that pregnant and breastfeeding women consume daily amounts of 250 mg of DHA minimum — a level that is difficult to achieve without regular consumption of fatty fish or supplementation.

What are the best sources of omega-3?

💡 Two to three servings of fatty fish per week are theoretically enough to cover your EPA/DHA needs. In practice, many women don't succeed — because of taste, habit, or precaution during pregnancy (risk of mercury in some species).

Plant sources (ALA) — useful, but insufficient alone

• Ground flaxseeds
• Grenoble walnuts
• Rapeseed oil, linseed oil
• Chia seeds

Important reminder: the conversion of ALA to EPA/DHA in your body is very limited (less than 10% depending on the studies). These sources are useful as a complement, but do not replace marine sources.

Supplementation — for whom, when?

If you do not eat fatty fish regularly, if you are a vegetarian or vegan, or if you are on the fertility journey: omega-3 supplementation is often recommended.

Give priority to:

• A fish oil or Of seaweed (for vegans — it's the original source of DHA in fish themselves)
• A ratio EPA + DHA clearly indicated on the label
• A shape triglyceride rather than ethyl ester (better absorption)
• A product tested for heavy metals (mercury, PCB)

Signs that may indicate a lack of omega-3

Your body speaks — you still need to know how to listen to it. An omega-3 deficiency can result in:

• Dry skin, dull or brittle hair
• Very painful periods (dysmenorrhea linked to an excess of proinflammatory prostaglandins)
• Cognitive fatigue or difficulty concentrating
• A fluctuating mood, increased sensitivity to stress
• Irregular cycles or a disturbed ovulation
• Vaginal dryness, often linked to a deficit in good fats

These signs aren't specific to omega-3 — but combined with a diet low in fish or healthy fats, they deserve attention.

Can omega-3 be taken during IVF?Yes, in the vast majority of cases. But as with any complement to an ART program, talk to your medical team about it. Some protocols may have specific recommendations.

Are plant-based omega-3 fatty acids (chia seeds, flax) sufficient?No, not alone. Vegetable ALA is very poorly converted to EPA and DHA. If you don't eat fish, seaweed oil is the most suitable solution.

At what time of day should you take your omega-3?At the time of a meal containing fats, to optimize their absorption. Morning or noon are often preferable to avoid acid reflux in the evening.

What Reflet offers you to go further

Food is one of the most powerful — and most underrated — levers on your fertility and hormonal health. It's not about the perfect diet. It's a question of understanding what your body really needs at this specific stage in your life.

That's exactly what we built in Fertily Diet' : a video series dedicated to food and fertility, designed to give you clear answers, without guilt and without impossible injunctions.

👉 I discover Fertily Diet' on Reflet

In summary: what you need to remember about omega-3

• They are fatty acids essentials — your body doesn't make them, you have to bring them
• They play a key role in anti-inflammation And the cell membrane fluidity
• In fertility, they support the oocyte quality, the uterine receptivity and hormonal balance
• During the Pregnancy and breast-feeding, the needs are increasing — DHA is crucial for the development of a baby's brain
• The best sources are Fatty fish (mackerel, sardines, herring)
• In case of an insufficient fish diet, quality supplementation is recommended

Omega-3 is not a nutritional detail. They are silent players in your cellular health — and therefore in your fertility. To know them is already to act.

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