Do Lactation Cookies Work? What the Evidence Actually Says About Galactagogues

The word galactagogue comes from the Greek for “milk” and “to bring forth.” It refers to any substance — food, herb, or medication — believed to promote or increase breast milk production.

Galactagogues fall into two broad categories:

• Pharmaceutical galactagogues: Prescription medications such as domperidone and metoclopramide. These work by increasing prolactin levels via a well-understood mechanism. Clinical evidence for their effectiveness is considerably stronger. They are prescribed when other approaches have not worked and are outside the scope of this article.
• Herbal and food-based galactagogues: Substances like oats, brewer’s yeast, fenugreek, fennel, blessed thistle, and goat’s rue. These are the ingredients in commercial lactation cookies, teas, and supplements. Their evidence base is more limited — and this is where the honest conversation is needed.

Lactation cookies are a food-delivery format for herbal and food-based galactagogues, typically combining oats, brewer’s yeast, flaxseed, and galactagogue herbs in a convenient snack.

The 2023 RCT: The Study Behind the Headlines

In 2023, a randomised controlled trial published in the American Journal of Clinical Nutrition examined 176 exclusively breastfeeding mothers over one month. One group ate daily lactation cookies containing oats, brewer’s yeast, flaxseed, and fenugreek; the other ate conventional cookies of similar weight and calories but without galactagogue ingredients. Researchers measured milk production rates objectively and assessed perceived milk sufficiency and breastfeeding self-efficacy.

The finding: no statistically significant difference between groups on any measure.

This is an important study and deserves to be taken seriously. But the authors themselves note key limitations:

• It tested one specific commercial product with one formulation — results should not be extrapolated to all lactation cookies or all galactagogue combinations
• Both groups showed increased milk production over the month — likely reflecting normal lactation establishment rather than any cookie effect
• Only 51% of participants completed the objective milk production measures, introducing significant attrition bias
• The study ran for one month with 2-month-old infants — effects at different lactation stages may differ
• Group-level averages do not capture individual variation — some mothers may respond meaningfully while others do not

The study is not evidence that lactation cookies never work. It is evidence that this specific product, in this population, at this stage, did not produce a statistically significant group difference in milk output. That’s a meaningful finding — but a narrower one than the headlines suggest.

The 2020 Cochrane Review: The Broader Landscape

The Cochrane Collaboration — a globally respected body for systematic research review — published a comprehensive review in 2020 examining oral galactagogues in mothers of healthy term infants. On herbal and food-based galactagogues, the conclusion was that while some studies showed promising signals, the overall quality of evidence was low to very low, limited by small sample sizes, inconsistent outcome measures, and methodological weaknesses.

The most conclusive finding: better research is needed before strong recommendations can be made in either direction.

This does not mean galactagogues are ineffective. It means the evidence base is not yet robust enough to confidently quantify how much benefit they provide, for whom, and under what conditions. That is a meaningfully different conclusion from “they don’t work.”

What Individual Ingredient Research Suggests

The picture becomes more interesting when you look at individual ingredients rather than lactation cookie products as a category. The article on foods that may increase breast milk supply covers each one in detail. Here is a summary of where the evidence currently sits:

• Galactagogues are not a substitute for the foundations. They cannot compensate for infrequent feeding, poor latch, or an underlying medical cause of low supply. Addressing those root causes — ideally with a lactation consultant — is the essential first step.
• Individual response is real. The group-level “no significant difference” finding is compatible with some individuals responding meaningfully. If you notice a positive effect, that is a valid data point.
• Nutritional value exists independently of galactagogue effect. A quality lactation cookie provides genuine caloric and nutritional support for breastfeeding mothers who need extra calories, iron, and sustained energy — regardless of any milk-boosting effect.
• Formulation matters. The 2023 RCT tested one specific product. Not all lactation cookies are equivalent in ingredient quality, dose, or overall nutritional profile.
• Context matters. Galactagogues appear most appropriate as one supportive element within a broader approach — adequate calories, good hydration, and frequent effective milk removal — rather than as a standalone intervention.

For the full nutritional framework that underpins milk supply, the guide on foods to increase breast milk supply sets out the complete evidence-based picture.

• Named galactagogue ingredients at meaningful amounts: Oats should be a primary ingredient. If fenugreek or fennel are included, they should appear high in the ingredient list, not as trace additions.
• Low refined sugar: Avoid products where sugar is the dominant ingredient. New mothers need sustained energy, not spikes and crashes.
• Allergen transparency: Essential for mothers managing a food-sensitive baby or following an elimination diet. Look for clear allergen labelling.
• No opaque proprietary blends: If the label says “lactation blend” without disclosing individual ingredient quantities, you cannot evaluate what you’re actually taking.
• Genuine nutritional density: Whole grains, healthy fats, and meaningful micronutrients rather than primarily sugar and refined flour.

The Nella Vosk lactation cookie range is formulated without brewer’s yeast, includes oats, fennel, and fenugreek as the primary galactagogue base, and is allergen-friendly with low refined sugar — designed to nourish rather than simply market.

Lactation cookies are most appropriately used as one supportive element within a broader approach, not as a first-line response to supply concerns.

They may be most useful when:

• You are already feeding or pumping frequently and effectively, and want additional nutritional support
• You want a convenient, one-handed snack that replaces nutritionally empty options
• You are adding galactagogue herbs to your diet and prefer a food format to supplements
• You are in the early weeks of establishing supply and want nutritional support alongside frequent feeding

They are less likely to be the answer when:

• Supply concerns have an underlying cause — latch difficulties, tongue tie, infrequent feeding, hormonal issues — that hasn’t been addressed
• You are significantly undereating or underhydrated (more foundational and more impactful than any galactagogue)
• You are hoping to compensate for skipped feeds or pumping sessions

For everything that genuinely supports milk supply — from feeding mechanics to nutrition to stress management — the guide on 10 proven ways to increase your milk supply covers each strategy with the same evidence-first approach.

• Using them as meal replacements: Lactation cookies are snacks, not substitutes for meals. They work best topping up nutrition between meals.
• Expecting results within hours: If there is an effect, it typically builds over days to weeks of consistent use, not after one or two cookies.
• Using them as the only supply intervention: The most evidence-based first steps for genuine supply concerns are increasing feeding or pumping frequency and checking latch with a lactation consultant.
• Not checking the ingredient list: Some products marketed as lactation support contain very small amounts of active ingredients alongside large amounts of sugar and refined flour. Read labels carefully.

Continuing if fenugreek appears to be reducing your supply: This is real and underreported. If supply decreases after starting a product containing fenugreek, stop and reassess.

For the complete framework on how nutrition supports breastfeeding — including hydration, caloric intake, and the full galactagogue evidence picture — return to the Breastfeeding Nutrition & Milk Supply: Evidence-Based Guide for Australian Mothers.

Ready to try a quality lactation cookie formulated without brewer’s yeast and with transparent, evidence-aligned ingredients? Browse the Nella Vosk lactation cookie range.

Prefer a warm drink format? The breastfeeding tea range combines fennel and fenugreek with other well-regarded herbs in a comforting daily option.

→ Also in this cluster: probiotics when breastfeeding: what the research actually shows