Black medic Toxic?

Updated 2026-03-06| 4 min read| 3,355 found this helpful

Only toxic in exceptional circumstances, despite containing phytoestrogens, saponins, and photosensitizing compounds

Exposure can lead to fertility disorders, bloat, photodermatitis, and growth depression in affected grazing animals

Primary treatment for adverse reactions is decontamination and targeted symptomatic supportive care

FAQ

Is Black medic toxic to Humans?

No confirmed human toxicity data is available for this plant (Non-toxic)

Is Black medic toxic to Cats?

No confirmed feline toxicity data is available for this plant (Non-toxic)

Is Black medic toxic to Dogs?

No confirmed canine toxicity data is available for this plant (Non-toxic)

Is Black medic toxic to Horses?

Potential symptoms with exceptional excessive exposure include fertility disorders (ovarian cysts, irregular cycles, anestrus), bloat, photodermatitis, and growth depression (Low)

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Toxicity Details

Humans

Non-toxic

No confirmed human toxicity data is available for this plant

Cats

Non-toxic

No confirmed feline toxicity data is available for this plant

Dogs

Non-toxic

No confirmed canine toxicity data is available for this plant

Horses

Low

Potential symptoms with exceptional excessive exposure include fertility disorders (ovarian cysts, irregular cycles, anestrus), bloat, photodermatitis, and growth depression

Toxicity Snapshot

Toxic PartsNo specific toxic parts identified; the plant is classified as a highly valuable forage crop, with adverse effects only occurring in rare exceptional cases of excessive intake

Exposure RouteIngestion of large quantities of plant material over prolonged periods; skin contact combined with UV exposure may trigger photosensitivity reactions

Toxic CompoundsPhytoestrogens (Coumestrol, Coumestan, Genistein, Formonetin, and related derivatives); Saponins; Bloating-inducing proteins; Photosensitizing factors

First Aid & Prevention

First 30 Minutes

• Remove all remaining plant material from the exposed individual's mouth and immediate environment
• Induce vomiting only if explicitly directed by a veterinarian or medical professional for large recent ingestions
• Move individuals showing signs of photosensitivity to a shaded area away from direct UV exposure immediately

Contact Vet Immediately

• Signs of bloat (abdominal distension, pain, difficulty breathing) appear after ingestion
• Fertility abnormalities, blistering/reddened skin (photodermatitis), or unexplained growth suppression are observed in grazing animals
• Large volumes of the plant are ingested by breeding livestock or pets with pre-existing health conditions

Prevention

• Avoid overgrazing pastures with high concentrations of black medic to limit excessive long-term intake
• Monitor grazing livestock for signs of bloat and photosensitivity during periods of rapid plant growth
• Limit intake of unprocessed black medic for breeding livestock to reduce risk of reproductive disruption

Treatment & Prognosis

• Administer decontamination measures such as activated charcoal for recent large-volume ingestions
• Provide symptomatic care tailored to presented symptoms (e.g. bloat relief, wound care for photodermatitis, hormone support for fertility issues)
• Follow standard emergency therapy protocols for severe adverse reactions as clinically indicated

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Professional Toxicology

Scientific NameMedicago lupulina L.

AliasesBlack medick、Nonesuch、Hopfenklee、Gelklee、Hopfen-Luzerne、Luzerne lupuline、Erba medica lupulina

Toxicity Grade

HumansNon-toxic

CatsNon-toxic

DogsNon-toxic

HorsesLow

Target Organs

Reproductive systemDigestive systemSkinEndocrine system

Mechanism of Action

• Phytoestrogens disrupt normal reproductive hormone signaling, leading to fertility abnormalities and cycle disruption

• Saponins and bloating proteins cause excess gas accumulation in the rumen of herbivores, leading to bloat (tympany)

• Photosensitizing compounds accumulate in skin tissue, triggering inflammatory reactions when exposed to UV radiation

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Risk of bloat, fertility disorders, and photodermatitis with prolonged excessive intake of dense stands of the plant

Sheep: May develop reproductive disruption and photosensitivity if grazed exclusively on black medic-rich pastures long-term

Goats: Adverse effects are rare, but high intake may cause mild digestive upset and reduced fertility in breeding females

Confusion Risk

The following plants look similar and may be confused:

Other Medicago species (e.g. alfalfa) Medicago spp.

Similar leaf and inflorescence morphology; key differentiator: black medic produces small black seed pods, while most other common Medicago species have brown or tan seed pods

Clover species Trifolium spp.

Identical trifoliate leaf structure; key differentiator: black medic has bright yellow flowers, while most common clover species produce white, pink, or red flowers

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Related Toxic Plants

Rosary pea

Abrus precatorius

Severe toxicity

Lupine

Lupinus spp.

Moderate toxicity

Golden chain tree

Laburnum anagyroides

High toxicity

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Data Sources

1. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.