Turmeric

A rhizomatous perennial plant of the ginger family, turmeric has been used in Ayurvedic and traditional Chinese medicine for over 4,000 years. Its primary bioactive compound, curcumin, is one of the most extensively studied phytomedicinals in modern pharmacology.

Herbaceous perennial growing 60–90 cm tall. Large oblong leaves with narrow lanceolate blades. Rhizomes are bright orange-yellow internally, tuberous, and aromatic. Inflorescence is a cylindrical spike with pale yellow flowers enclosed in green bracts.

Used extensively in Ayurvedic medicine as an anti-inflammatory, hepatoprotective, and wound-healing agent. In Traditional Chinese Medicine, used to invigorate blood, stimulate qi, and alleviate pain. Traditional applications include treatment of digestive disorders, skin conditions, respiratory ailments, and as a general tonic. Cultural use as a culinary spice and natural food preservative spanning millennia.

The primary bioactive constituents are curcuminoids (3–5% of rhizome by weight), predominantly curcumin (diferuloylmethane), demethoxycurcumin, and bisdemethoxycurcumin. Also present are sesquiterpene hydrocarbons including ar-turmerone, α-turmerone, and β-turmerone (essential oil 2–7%), as well as polysaccharides with immunomodulatory activity. Bioavailability of curcumin is notably low due to poor aqueous solubility, rapid metabolism, and systemic elimination; co-administration with piperine enhances bioavailability by up to 2000%.

Curcumin exerts pleiotropic effects through multiple molecular targets: (1) Downregulation of NF-κB pathway, reducing expression of pro-inflammatory cytokines TNF-α, IL-1β, IL-6; (2) Inhibition of COX-2 and 5-LOX, reducing prostaglandin and leukotriene synthesis; (3) Modulation of AMPK and mTOR signalling pathways; (4) Upregulation of Nrf2/ARE pathway, enhancing endogenous antioxidant defences including glutathione, catalase, and SOD; (5) Inhibition of JAK/STAT pathway; (6) Regulation of growth factor signalling including EGFR and VEGF; (7) Modulation of cell cycle regulators p53, p21, and cyclin D1.

Standardised extracts providing 400–600 mg curcuminoids per day, typically in 2–3 divided doses. Bioavailability-enhanced formulations (e.g., with piperine, as liposomal, or as nano-particle preparations) allow lower doses of 250–500 mg. Rhizome powder: 1–3 g daily. Curcumin with piperine: 500 mg curcumin + 5 mg piperine twice daily.

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