Botanical Overview
Lagerstroemia speciosa, commonly known as Banaba or Giant Crape-myrtle, is a tropical tree in the family Lythraceae native to Southeast Asia, India, and the Philippines. The primary medicinal part used is the leaf, which has garnered attention for its antidiabetic properties.
Energetics
The energetics of Banaba leaf are characterized as cooling and moistening with a bitter and sweet taste profile. It has a relaxing tonicity and supports the qi.
Primary Actions
- Antidiabetic
- Hypoglycemic
- Antioxidant
Indications
Western
- High blood glucose
- Diabetic symptoms
- Hyperlipidemia
Syndromes
- Type 2 diabetes mellitus
- Metabolic syndrome
TCM
No well-documented traditional indications found.
Ayurveda
No well-documented traditional indications found.
Unani
No well-documented traditional indications found.
Constituents & Mechanisms
Banaba leaf contains phytochemicals such as corosolic acid, ellagitannins, flavonoids, gallic acid, and tannins, which contribute to its hypoglycemic and antioxidant effects.
Dosage & Preparations
- Leaf infusion 2-4 g, 1 to 2 times daily
- Extract standardized to corosolic acid, 10-20 mg daily
Safety & Contraindications
Banaba is generally safe when used appropriately; however, caution is advised during pregnancy due to lack of sufficient safety data. Monitoring is recommended when used with antidiabetic medications to avoid additive hypoglycemic effects.
Astrological Correspondences
No reliable sources identified for planetary or elemental rulers associated with Lagerstroemia speciosa.
Selected References
- Antidiabetic effects of Lagerstroemia speciosa, Phytotherapy Research, Shirai R, et al., 2007
- Lagerstroemia speciosa (Banaba), Plants For A Future
- Phytochemical constituents and antioxidant properties of Lagerstroemia speciosa, Journal of Ethnopharmacology, Jung HA, et al., 2006