Why this massive plant genus was once thought to boost goat milk production

History · Published 20 October 2026 Swipe more like this →

In short: With over 3,000 species, Astragalus stands as the largest plant genus on Earth. While its name originates from an ancient Greek belief that it could increase milk production in goats, modern science remains skeptical of its medicinal claims, warning of potential risks ranging from toxicity to dangerous drug interactions.

Formally described by Carl Linnaeus in his 1753 work Species Plantarum, Astragalus is a diverse group of herbs and small shrubs native to temperate regions across the Northern Hemisphere. Belonging to the legume family Fabaceae, these plants are characterized by pinnately compound leaves and clusters of flowers featuring distinct banner, wing, and keel petals. Beyond their botanical classification, these plants serve as vital food sources for specific Lepidoptera larvae, including several case-bearing moths that feed exclusively on various Astragalus species.

The historical reputation of Astragalus is deeply rooted in traditional practices, particularly in Chinese medicine, where it has been utilized for centuries to address various health disorders. Proponents often point to phytochemicals like saponins and isoflavone flavonoids as the source of its purported benefits, such as increasing lactation. However, clinical evidence supporting these traditional uses is lacking. Major health institutions, including the Memorial Sloan Kettering Cancer Center, emphasize that there is no high-quality data confirming the efficacy or safety of these extracts for any medical purpose.

Safety concerns are significant, as dietary supplements containing these extracts often lack rigorous testing for purity or consistency. Beyond the risk of mild side effects like gastrointestinal upset or allergic reactions, Astragalus can pose serious dangers. Certain species found in the United States contain swainsonine, a neurotoxin responsible for 'locoweed' poisoning in animals, while others may accumulate toxic levels of selenium. Furthermore, the plant can interfere with blood sugar and blood pressure regulation, and it may dangerously interact with immunosuppressive medications used by cancer patients or organ transplant recipients.

Despite these risks, some species, such as A. alpinus and A. hypoglottis, are cultivated as ornamental garden plants for their vibrant flowers. While the genus remains a subject of botanical interest, the gap between traditional folklore and modern clinical validation serves as a stark reminder of the importance of scientific scrutiny when evaluating natural supplements.

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