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Soybean (Glycine max)

Botanical Information

  • Family: Fabaceae
  • Common Names: Soybean, Soya Bean
  • Parts Used: Seeds, oil, sprouts, leaves

Description

Glycine max is a leguminous plant native to East Asia, widely cultivated for its protein-rich seeds. It is a staple in traditional diets and herbal medicine due to its high nutritional content, hormone-modulating properties, and cardiovascular benefits.

Historical and Traditional Uses

  • Used in Traditional Chinese Medicine (TCM) to nourish the body and balance yin energy.
  • Traditionally consumed in Asia for its protein content and general health benefits.
  • Employed in modern herbal medicine for hormonal balance and heart health.
  • Used topically as an oil for skin nourishment and inflammation.

Constituents

  • Isoflavones (phytoestrogens)
  • Protein
  • Fatty acids
  • Saponins
  • Lecithin
  • Fiber
  • Minerals (calcium, magnesium, iron, potassium)

Actions

  • Phytoestrogenic (hormone-modulating)
  • Cardioprotective
  • Anti-inflammatory
  • Antioxidant
  • Hepatoprotective (liver-supporting)
  • Nutritive

Medicinal Uses

1. Hormonal Balance:
Soy isoflavones help balance estrogen levels, making it useful for menopausal symptoms, bone health, and hormonal fluctuations.

2. Cardiovascular Support:
Soy protein and isoflavones have been shown to lower cholesterol, reduce blood pressure, and support heart health.

3. Bone Health:
Isoflavones help maintain bone density, reducing the risk of osteoporosis.

4. Antioxidant and Anti-Inflammatory Benefits:
Rich in antioxidants, soy helps reduce inflammation and supports immune function.

5. Skin and Hair Health:
Soy oil and extracts are used in cosmetics to improve skin elasticity, hydration, and hair strength.

Preparation and Dosage

Culinary Use:

  • Whole soybeans, tofu, tempeh, miso, and soy milk are common dietary forms.

Soy Extract:

  • 40-100 mg of isoflavones daily for hormonal and cardiovascular benefits.

Soy Lecithin:

  • 1-2 tablespoons per day for cognitive and liver support.

Topical Use:

  • Soy oil applied to skin for hydration and anti-aging benefits.

Precautions and Contraindications

  • Thyroid Function: Soy can interfere with iodine absorption and thyroid function; individuals with hypothyroidism should consume it in moderation.
  • Hormone-Sensitive Conditions: May not be suitable for individuals with estrogen-sensitive cancers.
  • GMO Consideration: Choose organic, non-GMO soy products when possible.
  • Allergies: Soy is a common allergen; avoid if sensitive.

Energetics (Traditional Medicine Perspectives)

  • Traditional Chinese Medicine (TCM): Cooling and moistening; supports yin energy and digestion.
  • Ayurveda: Primarily balances Pitta and Vata, but excessive use may increase Kapha.

Combinations

  • For Hormonal Balance: Combine with black cohosh and red clover.
  • For Heart Health: Combine with hawthorn and garlic.
  • For Bone Support: Combine with nettle and horsetail.

Harvesting and Storage

  • Harvesting: Soybeans are harvested in late summer to early fall when pods are fully mature.
  • Storage: Store dried soybeans in airtight containers away from moisture and light.

Modern Research

Studies confirm Glycine max’s benefits for cardiovascular health, hormonal balance, and inflammation reduction, reinforcing its traditional applications.

Soybean remains a valuable plant in both traditional and modern herbal medicine, particularly for hormone modulation, cardiovascular health, and bone strength.