Should you take DHA if you are breastfeeding?

If you are breastfeeding and wondering whether you need a DHA supplement, the short answer is: your baby's brain and eye development depend on the DHA you pass through milk, and that DHA content depends on what you eat. If your diet is low in oily fish or algae-based omega-3 sources, supplementation is worth considering seriously.

That said, not every DHA supplement is the same, and we think the differences matter more than most labels suggest, and the dosage guidance is not as simple as some brands make it sound. Here is what the evidence actually supports, what it does not, and what you should discuss with your midwife or GP before making a decision.

Why DHA matters for your baby's brain and eye development

DHA as a structural building block in neural tissue

DHA (docosahexaenoic acid) is an omega-3 fatty acid that forms a major structural component of cell membranes in the brain and retina. This is established nutrition science, not a marketing claim. Your baby's brain grows rapidly during the first year of life, and DHA is one of the building blocks it needs to do that properly.

You will notice this matters most in the early months. During those bleary-eyed 3am feeds, you are not just providing calories. You are delivering the fatty acids your baby's nervous system is actively incorporating into neural tissue. The composition of what you deliver depends directly on what you have been eating and supplementing. We found this particularly striking when we reviewed the global breast milk DHA data.

What the research links DHA to in infant development

Research has associated adequate infant DHA intake with cognitive and visual development outcomes. A randomised controlled trial (the DIAMOND study, published in the American Journal of Clinical Nutrition) found that infants receiving DHA-supplemented formula scored higher on cognitive assessments than those on unsupplemented formula.

The Avon Longitudinal Study of Parents and Children (ALSPAC), which followed over 14,000 pregnant women, found that higher maternal DHA intake during pregnancy was associated with improved cognitive outcomes in children.

What this does not mean: DHA supplementation will not guarantee your child hits developmental milestones faster, and it is not a substitute for broader nutrition. We would frame it this way: the evidence supports DHA as one necessary component of infant neural development, not a magic ingredient.

How your diet changes the DHA in your breast milk

Here is the practical reality you face at the kitchen table: milk DHA content is not fixed. It reflects your recent dietary intake. If you are eating oily fish two or three times a week, your breast milk will contain more DHA. If you happen to be vegan, vegetarian, or simply not eating much fish, your breast milk DHA levels will be lower.

Research by Makrides, Neumann, and Gibson (1996, European Journal of Clinical Nutrition) demonstrated that maternal DHA supplementation directly increased the proportion of DHA in breast milk. This is an ingredient-level fact, well-established in the lactation nutrition literature.

You might assume that your body would prioritise your baby's needs and maintain breast milk DHA regardless of your diet. Unfortunately, that is not how it works. Your body will draw on its own DHA stores to some extent, but if those stores are already depleted from pregnancy, supplementation becomes more important, not less.

What DHA supplementation can and cannot do while breastfeeding

Here is where you need to be careful, because some of the claims circulating online go well beyond what the evidence supports.

EFSA-authorised DHA claims for breastfeeding mothers

What EFSA-authorised claims support: DHA contributes to the maintenance of normal brain function and normal vision (EFSA-authorised health claims under Commission Regulation EU No 432/2012, at a daily intake of 250mg). Supplemental DHA intake by the mother contributes to the normal brain and eye development of breastfed infants (EFSA-authorised claim, at a maternal intake of 200mg DHA per day, in addition to the recommended daily intake of 250mg EPA+DHA).

Claims about postpartum depression and milk supply lack strong evidence

What the evidence does not support as settled: You may have read that DHA supplements reduce the risk of postpartum depression. Some observational studies have found associations between low omega-3 levels and postpartum depression, but the intervention trials are mixed.

A randomised controlled trial by Makrides et al. (2010, JAMA) found that DHA supplementation during pregnancy did not significantly reduce postpartum depression scores. This is not a claim you should rely on when deciding whether to supplement.

Similarly, claims that DHA supplements increase breast milk supply are not well-supported. Some preliminary studies have explored this, but the evidence is insufficient to make a reliable recommendation. If you are dealing with supply, talk to a lactation consultant rather than relying on a supplement to fix it.

Clean Omega-3 DHA Algae-derived DHA capsules. Solvent-free Swiss extraction. Vegan, no fish involvement. £42.95

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Choosing a DHA supplement: contamination, source, and what to check on the label

Why contamination matters more when you are breastfeeding

When you are standing in the supplement aisle or scrolling through options online at midnight with a sleeping baby on your chest, here is what actually matters for choosing a DHA supplement.

Contamination risk is real with fish-derived sources. Fish oil supplements can contain mercury, PCBs, and dioxins depending on the source fish and purification methods. This is a legitimate concern during breastfeeding, when contaminants can pass into breast milk. If you go the fish oil route, look for products that publish independent third-party testing certificates for heavy metals and persistent organic pollutants.

Algae-derived DHA vs fish oil DHA for breastfeeding

Algae-derived DHA avoids the fish contamination question entirely. Algae is where fish get their DHA in the first place, so going straight to the source skips the bioaccumulation problem. It is also the only option if you are vegan or vegetarian.

We produce Clean Omega DHA, which is derived from the microalgae Schizochytrium sp. and provides 250mg DHA per capsule. We chose an algae source to avoid the heavy-metal contamination risk from fish-derived oils. The extraction is solvent-free and the product is certified vegan.

Disclosure: Phytality is the publisher of this article and the manufacturer of Clean Omega DHA. We have aimed to be accurate about both its strengths and its limitations below.

The trade-off with algae-derived DHA: most algae DHA supplements, including ours, provide DHA but not EPA. If you want both omega-3 fatty acids from a single supplement, fish oil gives you that combination. With algae, you'd need to pair a DHA supplement with a separate EPA source such as marine phytoplankton (which is naturally rich in EPA) to cover both fatty acids.

Recommended DHA dosage for breastfeeding mothers

You will find different numbers depending on which guidance you follow, so here is what the main bodies actually say.

The European Food Safety Authority (EFSA) recommends a daily intake of 250mg EPA+DHA for the general adult population, with an additional 100-200mg DHA for breastfeeding women. The UK's Scientific Advisory Committee on Nutrition (SACN) broadly aligns with this guidance.

Some researchers have suggested that higher intakes of 600-1000mg DHA per day may offer additional benefits, but this is based on individual studies rather than consensus guidelines. For those who are considering a higher dose, discuss it with your GP or midwife first, particularly if you are taking any blood-thinning medication, since omega-3 fatty acids can affect platelet aggregation at higher doses.

The practical version: one capsule of an algae DHA supplement providing 250mg, taken daily with food, meets the EFSA-recommended additional DHA intake for breastfeeding. That is the baseline. Whether you need more depends on your overall diet and individual circumstances.

Three practical ways to increase your DHA intake while breastfeeding

Algae-based DHA supplements for consistent daily dosing

1. An algae-based DHA supplement. This is the most consistent approach, especially if your diet does not regularly include oily fish. You know exactly how much DHA you are getting per capsule. We designed Clean Omega DHA to deliver 250mg per capsule for precisely this reason: it meets the EFSA supplemental recommendation in a single daily dose.

The limitation is that it provides DHA without EPA, so it is not a complete omega-3 solution on its own.

Oily fish and DHA-fortified foods as dietary sources

2. Oily fish, two to three times per week. Salmon, mackerel, sardines, and trout are all good sources. You will get both DHA and EPA this way, plus protein and other nutrients. The trade-off: you need to be mindful of mercury exposure. The NHS advises that breastfeeding women can safely eat up to two portions of oily fish per week but should avoid shark, swordfish, and marlin entirely.

3. DHA-fortified foods. Some eggs, milk alternatives, and yoghurts are fortified with DHA. The amounts are typically small (30-50mg per serving), so these work better as a top-up alongside one of the other approaches rather than as your primary DHA source. Check the label, because "omega-3 enriched" on the front does not tell you how much DHA is actually inside.

When to talk to your GP or midwife about DHA

We are not in a position to give you medical advice, and we would rather be clear about that than hedge around it. What we can do is flag the situations where a conversation with your GP matters more than reading another supplement label.

You should have a conversation with your GP or qualified healthcare professional about DHA supplementation if any of the following apply to you:

• You are vegan or vegetarian and do not eat any marine sources of omega-3
• You are taking blood-thinning medication (omega-3s can interact with anticoagulants)
• You have a known fish or shellfish allergy and are unsure about algae-derived alternatives
• You are concerned about your baby's development and want personalised advice rather than general guidance

DHA supplementation is generally well-tolerated, but "generally well-tolerated" is not the same as "right for everyone." Your midwife or GP can assess your individual situation and give you advice that accounts for your full medical history.

Frequently asked questions about DHA and breastfeeding

What is DHA, and why does it matter for breastfed babies?

DHA (docosahexaenoic acid) is an omega-3 fatty acid that serves as a structural component of brain and retinal cell membranes. Your baby receives DHA through your breast milk, and the amount they receive depends on your dietary intake. Adequate DHA supports normal brain function and normal vision development (EFSA-authorised claims, Commission Regulation EU No 432/2012).

Is it safe to take DHA supplements while breastfeeding?

DHA supplementation at standard doses (200-300mg per day) is considered safe for breastfeeding women by EFSA and the NHS. The main risk considerations are potential interactions with blood-thinning medications and, for fish-derived supplements, possible heavy-metal contamination. Algae-derived DHA avoids the contamination concern. As with any supplement, discuss it with your GP if you have specific medical conditions.

How much DHA should I take while breastfeeding?

EFSA recommends 250mg EPA+DHA daily for adults, with an additional 100-200mg DHA specifically for breastfeeding women. This means a total DHA intake of around 350-450mg per day is the target range under European guidance. Your GP or midwife can help you determine whether a higher dose is appropriate for your circumstances.

Can I get enough DHA from food alone?

If you eat oily fish (salmon, mackerel, sardines) two to three times per week, you can likely meet your DHA needs through diet.

If you are vegan, vegetarian, or simply do not eat fish regularly, supplementation is the most reliable way to ensure adequate DHA intake. DHA-fortified foods can contribute, but they typically provide smaller amounts than either fish or supplements. For more on plant-based omega-3 sources, we have covered this in detail separately.

What is the difference between fish oil DHA and algae-derived DHA?

The DHA molecule is identical regardless of source. The differences are practical: fish oil typically provides both EPA and DHA in a single capsule, while most algae supplements provide DHA alone. Algae-derived DHA carries no risk of marine contaminant bioaccumulation. Fish oil is more widely available and often cheaper per milligram. Your choice depends on your dietary requirements, contamination concerns, and whether you need EPA as well as DHA.

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Consult your GP or a qualified healthcare professional before starting any supplement.

Methodology and Disclosure

Phytality manufactures Clean Omega DHA, which is mentioned in this article. EFSA-authorised health claims are cited with their regulatory source and intake conditions. Category-level facts about DHA as a structural brain component and breast milk composition are established nutritional science. Comparisons between algae oil and fish oil reflect our editorial assessment.

We have included the limitations of our own product (DHA-only, no EPA) alongside its benefits. This content does not constitute medical advice.

Last reviewed: April 2026