Vitex megapotamica
StarVitex megapotamica
Synonyms: Vitex montevidensis var. multinervis, Vitex multinervis, Vitex montevidensis, Vitex taruma, Vitex viticifolia, Vitex megapotamica var. multinervis, Psilogyne viticifolia, Bignonia megapotamica, Vitex megapotamica f. albiflora
Western Herbalism Properties
Traditional Uses
In southern Brazil and neighbouring parts of Argentina, Paraguay and Uruguay, taruma (Vitex megapotamica) is a valued folk-medicine plant. The fruit, leaves and bark are prepared as decoctions and infusions used for gastrointestinal complaints, as an anti-inflammatory, for diabetes, and as a depurative or blood cleanser (South American ethnopharmacological literature). Experimental studies have lent some support to these uses, reporting antidiabetic effects of leaf extracts in alloxan-diabetic rats and notable antioxidant activity associated with chlorogenic and rosmarinic acids in the leaves.
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Botanical Description
Vitex megapotamica, popularly known as taruma, is a deciduous tree in the mint family Lamiaceae (formerly placed in Verbenaceae), native to subtropical South America in southern Brazil, Paraguay, Argentina and Uruguay. It commonly reaches 8 to 15 metres tall, with a spreading crown and grey, fissured bark. The leaves are opposite and palmately compound, typically with five (sometimes three) leaflets radiating from a common stalk, the leaflets elliptic to oblong with entire to slightly toothed margins. The bluish-violet to lilac, two-lipped tubular flowers are borne in branched axillary and terminal panicles and are attractive to bees. These are followed by rounded, fleshy drupes that ripen purplish-black and contain a hard stone; the fruits are edible and sometimes used to make jellies and beverages, and are eaten by wildlife. The species occurs in gallery forest, forest margins and on riverbanks, and its hard, durable wood is valued locally.
Active Constituents
20-Hydroxyecdysone
Phytoecdysteroid (steroid)Concentration: Documented constituent of the species
20-Hydroxyecdysone is the principal ecdysteroid reported from V. megapotamica. Ecdysteroids are associated with anabolic, adaptogenic and metabolic (including anti-hyperglycaemic and lipid-modulating) effects and are considered among the active constituents behind the plant's traditional anti-diabetic use.
Additional ecdysteroids (pterosterone, polypodine B)
Phytoecdysteroid (steroid)Concentration: Reported minor ecdysteroids
Pterosterone and polypodine B have been reported among the ecdysteroids of the genus and attributed to V. megapotamica, contributing to the plant's overall ecdysteroid-mediated metabolic activity.
Rosmarinic acid
Phenolic acid (caffeic acid ester)Concentration: Abundant in leaves; enriched in ethyl acetate fraction (~54 mg/mL in fraction)
Rosmarinic acid was the major phenolic quantified by HPLC in the leaves and correlated with the strongest antioxidant (lowest IC50) activity of the leaf fractions. It is a potent antioxidant and anti-inflammatory compound.
Chlorogenic acid
Phenolic acid (caffeoylquinic acid)Concentration: Minor phenolic in leaves
Chlorogenic acid was detected in small amounts across leaf fractions and adds to the antioxidant and metabolic (glucose-modulating) potential of the leaf extracts.
Iridoids
Iridoid glycoside (monoterpenoid)Concentration: Reported for the species/genus
Iridoids are characteristic constituents of Vitex and are reported from V. megapotamica; they contribute anti-inflammatory and other pharmacological activities typical of the genus.
⚠ Drug Interactions
Antidiabetic drugs (insulin, sulfonylureas, metformin)
Leaf extracts and fractions produced significant anti-hyperglycaemic effects in normal and alloxan-diabetic rats. Concomitant use with glucose-lowering medication could theoretically produce additive hypoglycaemia.
Clinical note: Extrapolated from consistent animal antihyperglycaemic data; monitor blood glucose if combined with antidiabetic therapy. No human interaction studies exist.
Preparation Methods
Leaf infusion / decoction (traditional Brazilian)
Parts: Leaf
In southern Brazilian folk medicine the leaves of taruma are infused or decocted and taken to help manage diabetes and obesity. This reflects traditional practice; while animal studies support anti-hyperglycaemic activity, standardised human dosing is not established.
Bark/leaf hydroalcoholic extract
Parts: Leaf, Bark
Hydroalcoholic and methanolic extracts have been prepared for research; a 90-day study found the methanolic leaf extract well tolerated up to 900 mg/kg in rats, but human safety and dosing remain undefined.
Clinical Studies
Effect of crude extract and fractions from Vitex megapotamica leaves on hyperglycemia in alloxan-diabetic rats
Oral crude extract significantly reduced serum glucose in both normal and diabetic rats, and the ethyl acetate and n-butanol fractions lowered glycaemia in diabetic animals, supporting an anti-hyperglycaemic action and the plant's traditional use for diabetes.
HPLC Analysis of Phenolics Compounds and Antioxidant Capacity of Leaves of Vitex megapotamica (Sprengel) Moldenke
HPLC identified rosmarinic acid and chlorogenic acid in the leaves; the ethyl acetate fraction, richest in rosmarinic acid, showed the highest antioxidant capacity, linking the phenolic profile to the plant's antioxidant activity.
Repeated dose 90-day oral toxicity study of Vitex megapotamica (Spreng.) Moldenke
Wistar rats given the methanolic extract at 100, 300 and 900 mg/kg daily for 90 days showed no mortality, no clinical signs of toxicity, and no significant changes in body weight, haematology, biochemistry, organ weights or histopathology, indicating a favourable subchronic safety profile in this model.
References
- Zanatta, L.; de Sousa, E.; Cazarolli, L. H.; et al.. Effect of crude extract and fractions from Vitex megapotamica leaves on hyperglycemia in alloxan-diabetic rats . Journal of Ethnopharmacology (2007) [DOI]
- de Brum, T. F.; Zadra, M.; Piana, M.; et al.. HPLC Analysis of Phenolics Compounds and Antioxidant Capacity of Leaves of Vitex megapotamica (Sprengel) Moldenke . Molecules (2013) [DOI]
- Ribeiro, R. de C. L.; Donadel, G.; et al.. Repeated dose 90-day oral toxicity study of Vitex megapotamica (Spreng.) Moldenke . Drug and Chemical Toxicology (2022) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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