Alfalfa

Medicago sativa
Medicago sativa
Medicago sativa
Scientific classification
Kingdom
Phylum
Class
Order
Family
Genus	Medicago
Species	sativa
Binomial name	Medicago sativa
Binomial authority
Synonyms

Alfalfa (Medicago sativa) is a perennial flowering plant in the legume family (Fabaceae), renowned for its high nutritional value and diverse agricultural and medicinal uses. Widely cultivated around the world as a forage crop, alfalfa is used to feed livestock, improve soil fertility, and provide dietary supplements for humans.

'Medicago sativa (alfalfa)

Botanical Classification

Sprouted Alfalfa

Alfalfa Sprouts

Botanical Characteristics

Alfalfa grows between 30–90 cm (1–3 feet) in height and exhibits a bushy growth habit. Its leaves are trifoliate, each comprising three small leaflets. The plant produces clusters of purple to blue flowers, and seed pods that curl in a spiral, each containing several seeds. A deep root system enables alfalfa to tolerate drought and improve soil structure.

Cultivation and Agronomy

Climate and Soil Requirements

Alfalfa thrives in temperate climates and prefers well-drained soil with neutral to slightly alkaline pH. It requires at least 38 cm (15 inches) of annual rainfall or equivalent irrigation.

Propagation and Harvesting

Alfalfa is typically sown via seed into prepared seedbeds. Germination requires good soil contact and moisture. Harvesting is generally done during the early flowering stage to optimize nutritional value.

Crop Rotation and Management

Alfalfa is commonly rotated with other crops to prevent disease, manage pests, and maintain soil health. Practices like irrigation, weed control, and pest management are vital to maintaining high yields.

Agricultural and Dietary Uses

Forage Crop

Alfalfa is among the most valuable forage crops due to its high protein, vitamin, and mineral content. It is fed to cattle, horses, sheep, goats, and other ruminants as hay, silage, or pasture.

Soil Enrichment

Alfalfa roots fix nitrogen in the soil via rhizobia bacteria, enhancing fertility. The deep root system also improves aeration and water infiltration, making it beneficial in sustainable agriculture.

Human Consumption

Humans consume alfalfa primarily as alfalfa sprouts, a popular addition to salads and sandwiches. Sprouts are rich in vitamins A, C, and K, as well as calcium and iron. However, raw sprouts can pose a risk of foodborne illness for vulnerable populations.

Health Benefits and Nutrition

Nutrient Profile

Alfalfa is rich in protein, fiber, vitamins (A, C, E, K, and B-complex), and minerals like calcium, magnesium, potassium, and iron.

Antioxidant Properties

Alfalfa contains flavonoids and phenolic compounds that help scavenge free radicals, potentially reducing the risk of chronic diseases like cardiovascular disease and certain cancers.

Cholesterol and Inflammation

Some studies suggest alfalfa may lower LDL cholesterol and reduce inflammation, benefiting those with arthritis or heart disease. Saponins in alfalfa are believed to play a role in these effects.

Supplementation and Traditional Uses

Alfalfa is used as a dietary supplement for conditions such as kidney disease, bladder disorders, diabetes, arthritis, and high cholesterol. It's also taken for its high vitamin K content and phytoestrogen activity.

Nutritional Composition

Alfalfa seeds, sprouted, raw

Portion	100 g
Fiber, total dietary	1.9 g
Calcium, Ca	32 mg
Iron, Fe	0.96 mg
Vitamin A, IU	155 IU
Vitamin C, total ascorbic acid	8.2 mg
Protein	3.99 g
Total lipid (fat)	0.69 g
Carbohydrate, by difference	2.1 g
Energy	96 kcal
Sugars, total including NLEA	0.2 g
Cholesterol	0 mg
Sodium, Na	6 mg
Fatty acids, total saturated	0.069 g

Mechanism of Action

Alfalfa may reduce cholesterol absorption in the intestines and modulate estrogen receptors, accounting for both its lipid-lowering and hormonal effects.

Effectiveness and Safety

Effectiveness Ratings

According to the Natural Medicines Comprehensive Database, alfalfa is rated "Insufficient Evidence to Rate" for most uses, including:

• Lowering cholesterol
• Treating asthma
• Managing diabetes
• Easing digestive problems

Safety Profile

Alfalfa leaves are likely safe when consumed in normal food amounts. However, long-term use of alfalfa seeds is considered unsafe due to links with systemic lupus erythematosus-like symptoms.

Precautions

• Pregnancy and breastfeeding: Avoid high doses due to estrogenic effects.
• Autoimmune diseases: May stimulate the immune system and worsen conditions like lupus or rheumatoid arthritis.
• Hormone-sensitive conditions: Avoid in breast cancer, endometriosis, and related disorders.
• Diabetes: May lower blood sugar—monitor glucose closely.
• Kidney transplant: May reduce the effectiveness of immunosuppressive drugs.

Drug Interactions

Major Interactions

• Warfarin (Coumadin): Alfalfa’s high vitamin K may reduce the effectiveness of anticoagulants.

Moderate Interactions

• Contraceptives: Alfalfa may reduce estrogen effectiveness in birth control pills.
• Estrogens: May interfere with hormone therapy.
• Immunosuppressants: May counteract drugs like cyclosporine and tacrolimus.
• Photosensitizing drugs: Alfalfa may increase sensitivity to sunlight when combined with certain antibiotics or antidepressants.

Herbal and Nutrient Interactions

• Vitamin E: Alfalfa may impair absorption and bioavailability of vitamin E.

Dosing Information

• For high cholesterol: 5–10 grams of dried herb or infusion, three times daily.
• Liquid extract (1:1 in 25% alcohol): 5–10 mL, three times daily.

Keto Friendliness

With only 0.2g of net carbohydrates per 100g, alfalfa sprouts are an ideal food for a ketogenic diet. They are rich in protein and vitamins, while being low in calories.

Other Names

Feuille de Luzerne, Herbe aux Bisons, Lucerne, Luzerne, Medicago, Purple Medick, Sanfoin, Phytoestrogen.

Gallery

• 

  Alfalfa

• 

  Salad with alfalfa sprouts

See Also

• Legume
• Forage crops
• Sprouting (food)
• Dietary supplement

External Links

• Alfalfa Production and Management Resources