Shaka: Traditional Uses, Evidence & Safety

TL;DR

Shaka is teak, Tectona grandis: better known as timber than as medicine. Ayurveda uses the wood and bark for skin disorders and bleeding complaints. Laboratory and animal studies report anti-inflammatory, wound-healing, gastroprotective, and blood-sugar effects from quinone-rich extracts. No human trials exist. The active quinones are potent chemistry, not gentle tonics.

What it is

Shaka (Tectona grandis Linn. f.), family Lamiaceae, is the teak tree of South and Southeast Asia. Its durability as timber comes from the same chemistry that interests pharmacologists: naphthoquinones including tectoquinone, lapachol, and deoxylapachol, plus anthraquinones, triterpenoids, and phenolic compounds (Shukla, Int J Pharm Sci, 2025).

Traditional medicine uses the wood, bark, leaves, roots, and flowers. The wood, the part named Shaka in the classical texts, is described as cooling and astringent.

Traditional use

Ethnopharmacological records list teak parts for colds, headaches, wounds, bronchitis, scabies, and constipation (Shukla review, 2025). In Ayurveda, the wood is used for skin disorders and bleeding complaints, consistent with its astringent, cooling classification.

Rasa-panchaka per the batch data: astringent taste (Kashaya), light and dry qualities (Laghu, Ruksha), cooling potency (Sheeta), pungent post-digestive effect (Katu vipaka). It pacifies Pitta and Kapha and aggravates Vata. Traditional framing. The laboratory record follows separately.

What modern research says

Anti-inflammatory activity (in vitro)

Methanolic and ethanolic teak extracts inhibited protein denaturation, a standard in-vitro inflammation model, at about 83.9% and 81.2% respectively, against 92.8% for aspirin. Leaf and bark extracts also showed activity against pro-inflammatory cytokines TNF-α and IL-1β (in vitro studies, compiled in IJPS review).

Cell-free and cell-culture findings: suggestive, not therapeutic.

Wound healing (animal study)

In rats with excision wounds, 5% and 10% teak leaf-extract ointments significantly reduced wound area within 4–8 days versus control (animal study, cited in IJPS review). Consistent with the traditional external use on skin.

Gastroprotective effect (animal study)

Ethanolic teak extract at 100 and 200 mg/kg orally reduced the ulcer index in ethanol-induced ulcer rats by 54.17% and 63.01% respectively, against 75.61% for omeprazole. Antioxidant markers normalized (animal study, cited in IJPS review).

Blood-sugar effects (in vitro)

Two naphthoquinones from teak branches and leaves inhibited α-glucosidase and promoted glucose uptake in adipocyte cell models, with molecular docking supporting the enzyme interaction (in vitro study, 2025) (ScienceDirect). Early-stage chemistry, not a diabetes treatment.

What the evidence does not support (yet)

No human clinical trials of teak in any form were identified. The traditional skin and bleeding uses have no direct modern study behind them; the animal and lab findings concern different parts and preparations.

Safety & contraindications

No human safety data for Shaka were identified. The quinone constituents (lapachol, tectoquinone) are biologically potent. Lapachol in particular has a complex pharmacology that argues against casual internal use. There are no data on pregnancy, breastfeeding, or drug interactions. Teak dust is a known occupational sensitizer in woodworkers, though that concerns the timber trade, not the medicine.

FAQs

What is Shaka in Ayurveda?

Shaka is teak wood (Tectona grandis). Ayurveda classifies it as cooling and astringent and uses it for skin disorders and bleeding complaints.

Does research support teak for wounds?

In rats, leaf-extract ointments sped wound closure. No human studies exist. Traditional external use is consistent with the finding, not confirmed by it.

Can teak lower blood sugar?

Two teak quinones inhibited a carbohydrate-digesting enzyme and increased glucose uptake in cell models. That is drug-discovery chemistry, not evidence you can use.

Is Shaka safe?

Human safety data do not exist. Its quinone constituents are potent, which is a reason for caution rather than confidence. No pregnancy or breastfeeding data.

Our editorial rule requires a pharmacopoeial or clinical-trial dose. None exists for Shaka, so we state none.

Annotated Sources

Phytochemistry (tectoquinone, lapachol, deoxylapachol) and ethnopharmacology are compiled in Shukla's 2025 comprehensive review, International Journal of Pharmaceutical Sciences (PDF). The anti-inflammatory, wound-healing, and gastroprotective findings are summarized in the IJPS reviews (review 1; review 2). The naphthoquinone antidiabetic study (α-glucosidase inhibition, adipocyte glucose uptake, docking) is the 2025 paper archived at ScienceDirect.

Disclaimer

This article is for educational purposes only and is not medical advice. Shaka's traditional uses have no human-trial support, and its quinone constituents are potent bioactive chemistry. Talk to a qualified healthcare practitioner before use — especially if pregnant, breastfeeding, managing a medical condition, or taking prescription medicines.