A few herbs and dietary habits can reduce breast milk production, though the effect is usually dose-dependent. Small culinary amounts of most foods won’t make a noticeable difference. Concentrated forms, large quantities, or repeated intake over days are what tend to cause a dip. Whether you’re trying to protect your supply or intentionally reduce it during weaning, here’s what the evidence actually shows.
Sage
Sage is the herb most commonly linked to decreased milk supply, and it’s the one lactation professionals mention first when a parent wants to dry up production. The leaf contains a complex mix of compounds including essential oils like thujone and camphor. Interestingly, no controlled clinical studies have directly measured sage’s effect on human milk supply. Its reputation comes from a long tradition of use across multiple cultures for weaning and managing oversupply, and it remains the most widely recommended herbal option for intentionally reducing production.
If you’re trying to protect your supply, watch for sage in stuffing, sausage seasoning, and herbal tea blends. A pinch in a recipe is unlikely to cause problems, but eating sage-heavy dishes repeatedly or drinking sage tea could have a cumulative effect. If you’re actively trying to reduce supply, the common recommendation is a tea made from 1 to 3 grams of dried sage leaves, sipped throughout the day.
Peppermint and Menthol
Peppermint is a bit of a contradiction. In some cultures it’s used to boost milk supply, while in others it’s used to suppress it. Lab and animal studies show that menthol, the active compound in peppermint, can suppress milk production in cell cultures and in mice. But no clinical trials have confirmed this effect in humans. Part of the uncertainty is that menthol gets rapidly converted to a different compound after you swallow it, and researchers aren’t sure whether that converted form still affects lactation.
The practical takeaway: a cup of peppermint tea or a few mints after dinner is probably fine. What some nursing parents report causing trouble is heavy, repeated exposure. Think large handfuls of strong peppermint candies, multiple menthol cough drops per day during cold season, or drinking concentrated peppermint tea daily. If you notice a supply dip and can’t figure out why, check your cough drops, throat lozenges, and flavored teas for menthol content.
Parsley
Parsley appears on nearly every list of milk-reducing foods, particularly when consumed in large amounts. Like sage, the evidence is traditional rather than clinical. A garnish on your plate won’t matter. Eating tabbouleh or other parsley-heavy dishes day after day is where some parents notice a difference. If you’re concerned, treat it the same way as sage: small amounts in cooking are fine, but avoid making it a dietary staple while you’re building or maintaining supply.
Chasteberry
Chasteberry (also sold as Vitex) is an herbal supplement with a genuinely interesting dose-dependent effect on the hormone prolactin, which drives milk production. At low doses, chasteberry actually increases prolactin and has been used as a supplement to boost supply. At high doses, it does the opposite. Compounds in the berry bind to dopamine receptors in the pituitary gland, and at higher concentrations this binding suppresses prolactin release.
In one study of healthy men, a low dose increased prolactin by about 16%, while a dose four times higher decreased it by about 10%. A separate study in women with elevated prolactin found that chasteberry extract lowered prolactin levels by 44% to 47% over three months, comparable to a prescription medication. Chasteberry has also been used in Persian traditional medicine specifically to reduce oversupply. If you’re taking a Vitex supplement for cycle regulation or another reason while nursing, it’s worth knowing that the dose matters enormously for which direction your supply goes.
Alcohol
Alcohol doesn’t reduce your overall capacity to make milk, but it temporarily disrupts the hormonal signals that release it. Oxytocin triggers the let-down reflex, and alcohol interferes with oxytocin release during nursing. Animal studies show that acute alcohol exposure significantly inhibits both the oxytocin surge and the suckling-triggered prolactin rise that sustains production. Whether this translates identically to humans hasn’t been confirmed in controlled trials, but the hormonal mechanism is well understood.
The practical effect: if you drink and then nurse, your baby may get less milk at that feeding because let-down is impaired. Over time, if feedings are consistently less effective, your body gets the signal to produce less. An occasional drink isn’t likely to affect long-term supply, but regular heavy intake could.
Caffeine
Caffeine doesn’t directly suppress milk production. The concern is indirect. High caffeine intake can make your baby fussy, jittery, or sleep poorly, which may lead to shorter or less effective feedings. Over time, reduced demand at the breast can reduce supply. Infants of mothers consuming the equivalent of 10 or more cups of coffee daily showed fussiness, jitteriness, and disrupted sleep patterns.
Most guidelines suggest staying under 300 mg per day (roughly two to three 8-ounce cups of brewed coffee), though some European authorities recommend a lower cap of 200 mg. At that level, studies found no statistically significant difference in infant sleep disruption. Caffeine itself isn’t drying up your milk. It’s the downstream effect on your baby’s feeding behavior that can cause supply to drift downward.
Jasmine Flowers
This one is less about eating and more about topical use, but it’s worth mentioning because it shows up in traditional weaning practices. In a clinical study, jasmine flowers applied directly to the breasts were compared to a prescription lactation suppressant. Both treatments reduced prolactin levels, though the medication caused a larger hormonal drop. When it came to the things that actually matter, like engorgement, milk production, and pain, the two approaches were equally effective. Jasmine even had a slight edge: it didn’t cause the rebound lactation that occurred in some women on the medication.
Cabbage Leaves
Cold cabbage leaves placed on the breasts are a classic home remedy for engorgement during weaning. Multiple studies have looked at this, and the picture is mixed. Cabbage leaves do appear to reduce breast pain regardless of whether they’re chilled or room temperature. But a meta-analysis concluded there’s no strong evidence they actually reduce engorgement better than doing nothing, since engorgement tends to resolve on its own. One randomized study even found that women using cabbage leaves breastfed exclusively for slightly longer (36 days versus 30), suggesting the comfort they provide may actually help sustain nursing rather than end it. Researchers attributed any benefit mostly to psychological mechanisms rather than a direct effect on milk production.
Severe Calorie Restriction
Crash dieting is sometimes blamed for supply drops, but the research is more reassuring than you might expect. Gradual weight loss of up to about 4.5 pounds per month has no measurable effect on milk volume or composition, as long as you’re not significantly undernourished and you’re nursing on demand. Even a fairly aggressive short-term energy deficit of 35% (through dieting, exercise, or both) over 11 days, resulting in more than two pounds of weight loss per week, did not adversely affect lactation in a randomized trial.
That said, these studies looked at otherwise well-nourished women. If you’re already eating very little or have nutritional deficiencies, the margin for error shrinks. The bigger risk with undereating isn’t usually a dramatic supply crash. It’s that fatigue and low energy lead to fewer feedings or less effective pumping sessions, which signals your body to scale back production.
What Actually Matters Most
For most nursing parents, no single food is going to tank your supply overnight. The foods and herbs on this list become relevant in two scenarios: when you’re consuming them in large, concentrated, or repeated amounts, or when you’re already dealing with a fragile supply and a small additional factor tips the balance. The strongest drivers of milk production are frequency and thoroughness of breast emptying. A few peppermint candies or a sage-seasoned chicken breast won’t override consistent nursing or pumping. But if your supply feels shaky, scanning your diet for these items is a reasonable step before assuming something more complicated is going on.