Lagerstroemia speciosa (Banaba) leaves have been traditionally used for treating diabetes and kidney diseases. Scientific evidences support its anti-diabetic property since it contains triterpene acids (oleanolic acid, arjunolic acid, asiatic acid, maslinic acid, corosolic acid, and 23-hydroxyursolic acid) that have α-glucosidase and α-amylase inhibitory activity. Among these, corosolic acid was observed to have the best α-glucosidase inhibition. Corosolic acid was also found to exhibit antihyperlipidemic, antioxidant, anti-inflammatory, antifungal, antiviral, antineoplastic and osteoblastic activities. Lagerstroemin, an ellagitannin, and Penta-O-galloyl-glucopyranose, a potent gallotannin, are two compounds also isolated from banaba leaf extracts wherein both have insulin-like glucose transport stimulatory activity and exhibit anti-adipogenic properties. Additionally, other compounds such as valoneic acid dilactone and ellagic acid from banaba leaves possess xanthine oxidase inhibitory activity making it useful for hyperuricemia or gout.

Queen’s crape myrthle/Banaba

Other Names: 
Queen's Crape Myrtle
Other Traditional Medicinal Uses: 
  • Antioxidant
  • Anti-inflammatory
  • Anti-diabetic/Antihyperglycemic
  • Nephroprotective
  • Cardioprotective
  • Anti-obesity
  • Antihyperlipidemic
  • Antibacterial
  • Antiviral
  • Antifungal
  • Antidiarrheal
  • Antihyperuricemic/Anti-gout
  • Antinociceptive/analgesic
  • Reduces risk of cancer
References: 
  • http://pubs.acs.org/doi/abs/10.1021/jf802152z https://link.springer.com/article/10.1007%2Fs10787-008-7002-6?LI=true
  • http://onlinelibrary.wiley.com/doi/10.1002/ptr.3664/full http://onlinelibrary.wiley.com/doi/10.1002/ptr.2661/full
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  • http://www.sciencedirect.com/science/article/pii/S0378874109007880
  • http://imsear.li.mahidol.ac.th/handle/123456789/145106
  • http://www.sciencedirect.com/science/article/pii/S0308814612012940 https://www.researchgate.net/profile/Elmer-Rico_Mojica/publication/264417324_Hypoglycemic_activity_of_irradiated_Banaba_Lagerstroemia_speciosa_Linn_leaves/links/53e01fff0cf2a768e49f592f/Hypoglycemic-activity-of-irradiated-Banaba-Lagerstroemia-speciosa-Linn-leaves.pdf
  • http://www.sciencedirect.com/science/article/pii/S0975357510801099
  • https://www.cabdirect.org/cabdirect/abstract/19890356203
  • https://www.jstage.jst.go.jp/article/jphs/93/1/93_1_69/_article
  • http://www.academicjournals.org/journal/JMPR/article-abstract/356280A15449
  • https://www.cabdirect.org/cabdirect/abstract/20113070907