Lactation brownies are regular brownies boosted with a handful of ingredients thought to support breast milk production: brewer’s yeast, oats, flaxseed, and sometimes coconut oil. They’re simple to make with a standard brownie recipe as your base, and most batches come together in under 40 minutes.
The Base Recipe
Start with a classic fudgy brownie recipe, then fold in the milk-boosting extras. Here’s a full batch that makes about 16 brownies:
- Butter: 1/2 cup (1 stick), melted
- Sugar: 1 cup granulated
- Eggs: 2 large
- Vanilla extract: 1 teaspoon
- Cocoa powder: 1/3 cup unsweetened
- All-purpose flour: 1/2 cup
- Salt: 1/4 teaspoon
- Chocolate chips: 1/2 cup (optional, but worth it)
Then add the lactation ingredients:
- Brewer’s yeast: 3 tablespoons
- Ground flaxseed: 2 tablespoons
- Old-fashioned rolled oats: 1 cup
Preheat your oven to 350°F. Grease or line an 8×8-inch baking pan. Melt the butter, then stir in sugar, eggs, and vanilla. Add the cocoa powder, flour, and salt and mix until just combined. Fold in the oats, ground flaxseed, brewer’s yeast, and chocolate chips. Spread into the pan and bake for 20 to 25 minutes. The center should look set but still slightly soft. Let them cool in the pan for at least 10 minutes before cutting.
The texture will be denser and chewier than a standard brownie because of the oats. If you prefer a thinner, crispier bar, use a 9×13-inch pan instead and reduce baking time by a few minutes.
What Each Ingredient Is Supposed to Do
Brewer’s yeast is the ingredient most commonly credited with boosting supply. It’s rich in B vitamins, chromium, and selenium. According to the NIH’s LactMed database, animal studies suggest brewer’s yeast may increase milk production, but the effect is likely tied to improved overall nutrition rather than any direct action on lactation hormones. There’s no established clinical dose for breastfeeding, and no professional organization currently recommends it. That said, it’s been a staple in lactation recipes for decades, and many nursing parents report a noticeable difference.
Oats contain plant compounds called saponins, which some researchers believe interact with the pituitary gland, the part of the brain that produces prolactin and oxytocin (the two hormones that drive milk production and let-down). Oats are also a good source of iron, and low iron levels have been linked to reduced milk supply. Even if the hormonal connection is still theoretical, oats add fiber, sustained energy, and a satisfying chew to the brownies.
Ground flaxseed is high in alpha-linolenic acid (ALA), an omega-3 fatty acid. A small NIH-cited study of seven nursing women found that supplementing with flaxseed oil for four weeks raised the ALA content of their breast milk from about 1.9% of fatty acids to 7.5%. That increase reversed within a week of stopping. Flaxseed didn’t raise DHA levels in breast milk, so it’s not a substitute for a DHA supplement if you’re taking one, but it does add healthy fats and fiber to the brownies.
Tips for Better-Tasting Brownies
Brewer’s yeast has a bitter, slightly beer-like flavor that can overpower a batch if you’re not careful. Cocoa powder and chocolate chips do a lot to mask it. If you find 3 tablespoons too strong, start with 2 and work your way up. Some people also add a tablespoon of peanut butter or a splash of espresso to further balance the bitterness.
Use ground flaxseed, not whole seeds. Whole flaxseeds pass through the body undigested, so you won’t absorb the omega-3s. You can buy pre-ground flaxseed (often labeled “flax meal”) or grind whole seeds in a coffee grinder. Store ground flax in the fridge or freezer because it goes rancid quickly at room temperature.
Pulse the oats in a food processor a few times if you want a smoother brownie. Leaving them whole gives you more of a granola-bar texture, which some people prefer. Either works.
Substitutions That Work
If you can’t find brewer’s yeast, nutritional yeast is a close relative. Both come from the same species of yeast (Saccharomyces cerevisiae) and both provide B vitamins. A review published in the journal Nutrients noted that some sources treat them as interchangeable for lactation purposes, while others insist only brewer’s yeast is effective. The honest answer is that neither product has strong clinical evidence behind it, so using nutritional yeast is a reasonable swap. Nutritional yeast has a milder, cheesier flavor that some people actually prefer in baked goods.
For a gluten-free version, replace the all-purpose flour with an equal amount of almond flour or a 1:1 gluten-free baking blend. Make sure your oats are labeled gluten-free, since standard oats are often processed alongside wheat. Coconut oil can replace butter at the same measurement if you’re avoiding dairy.
To cut sugar, reduce the granulated sugar to 3/4 cup and add a mashed banana for moisture. You can also use coconut sugar as a 1:1 replacement. The brownies won’t be as glossy on top, but the flavor holds up well.
How Many to Eat (and How to Store Them)
Most lactation cookie and brownie recipes suggest eating one to three servings per day. There’s no clinically established dose for any of the galactagogue ingredients in brownie form, so this is more tradition than science. Eating the whole pan in one sitting won’t double your supply, but spacing out two or three brownies throughout the day gives you a steady intake of the key ingredients along with extra calories, which nursing bodies need. Breastfeeding burns roughly 300 to 500 extra calories a day, and calorie-dense snacks like these help make up the difference.
Store leftovers in an airtight container at room temperature for up to 3 days, or in the fridge for a week. They freeze well for up to 3 months. Wrap individual brownies in plastic wrap, then place them in a freezer bag. Thaw at room temperature for about 30 minutes or microwave for 15 to 20 seconds.
Potential Side Effects
Brewer’s yeast can cause bloating and gas in some people, and a few nursing parents report that their babies seem gassier when they eat large amounts. If you or your baby seems unusually uncomfortable, try reducing the brewer’s yeast to 1 tablespoon per batch and see if that helps. People with yeast sensitivities or a history of frequent yeast infections may want to start with a small amount to see how they react.
Flaxseed is high in fiber, so if your diet is typically low in fiber, adding a lot at once can cause digestive discomfort. The 2 tablespoons in a full batch, spread across 16 brownies, is a modest amount per serving and unlikely to cause issues for most people.