Is Alfalfa safe while breastfeeding?
Here is what LactMed, the Drugs and Lactation Database published by the U.S. National Institute of Child Health and Human Development (NICHD), reports about Alfalfa. The text below is quoted from that source — it is not our own verdict.
Summary of use during breastfeeding
Alfalfa (Medicago sativa) leaves and sprouts contain saponins, estrogenic isoflavonoids (e.g., daidzein, genistein), vitamin K, and the amino acid L-canavanine. Alfalfa is a purported galactogogue and is included in some proprietary mixtures promoted to increase milk supply;[1-5] however, no scientifically valid clinical trials support this use. Galactogogues should never replace evaluation and counseling on modifiable factors that affect milk production.[6,7] Daidzein and genistein are excreted into breastmilk in small amounts,[8-11] but have not been measured specifically after alfalfa intake. No data exist on the excretion of other components of alfalfa into breastmilk or on the safety and efficacy of alfalfa in nursing mothers or infants. Alfalfa is generally well tolerated and is "generally recognized as safe" (GRAS) as a food by the U.S. Food and Drug Administration. Worsening of systemic lupus erythematosus has been reported, possibly caused by immune system stimulation by L-canavanine. Because of its vitamin K content, alfalfa should be avoided in persons taking warfarin.
Dietary supplements do not require extensive pre-marketing approval from the U.S. Food and Drug Administration. Manufacturers are responsible to ensure the safety, but do not need to prove the safety and effectiveness of dietary supplements before they are marketed. Dietary supplements may contain multiple ingredients, and differences are often found between labeled and actual ingredients or their amounts. A manufacturer may contract with an independent organization to verify the quality of a product or its ingredients, but that does not certify the safety or effectiveness of a product. Because of the above issues, clinical testing results on one product may not be applicable to other products. More detailed information about dietary supplements is available elsewhere on the LactMed Web site.
Effects on the breastfed infant
Relevant published information was not found as of the revision date.
Effects on milk supply
Relevant published information was not found as of the revision date.
Levels in milk
Maternal Levels. Relevant published information was not found as of the revision date.
Infant Levels. Relevant published information was not found as of the revision date.
“No published information” means the studies do not exist yet — not that Alfalfa is known to be harmful, and not that it is known to be safe. Your prescriber or pharmacist can weigh your baby's age and whether a better-studied alternative would do the same job. Worth asking before stopping a medicine you need.
Source: Drugs and Lactation Database (LactMed), National Institute of Child Health and Human Development (NICHD), via NCBI Bookshelf, record “Alfalfa” (LM916). LactMed on NCBI Bookshelf. LactMed is a registered trademark of the U.S. Department of Health and Human Services.
Educational summary of an authoritative source — not medical advice. Never start, stop, or change a medicine while breastfeeding without confirming with your doctor.