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Charaka Samhita, Sutrasthana 4.17
Anilahara... devadaru -- Devadaru is placed in the Anilahara (Vata-reducing) group. Its Ushna Virya directly counters Vata's Sheeta quality; its penetrating properties reach the deep channels where Vata accumulates.

Classical documentation

Ashtanga Hridayam documents Devadaru across multiple disease chapters: Amavata (rheumatoid-type joint conditions -- warming, channel-clearing for Vata-Ama in joints), Shoola (abdominal and other pain conditions), Adhmana (abdominal bloating from Vata), and as a component in Dashanga Lepa (the ten-ingredient classical anti-inflammatory paste). In Panchakarma, Devadaru is a key component in Sarvanga Bashpa Sweda (full-body steam) preparations -- its volatile compounds from the heartwood are documented as penetrating the skin channels during steam therapy.

Himalayan source and modern research
Cedrus deodara heartwood contains sesquiterpene compounds including himachalol and alpha-himachalene. Research documents anti-inflammatory activity consistent with the classical Shoolahara and Shothaghna documentation. The heartwood's essential oil is among the more studied Himalayan medicinal tree products.
Devadaru in Panchakarma
Devadaru is a standard component in classical Kashaya Svedana (herbal decoction steam) preparations used in Panchakarma Purvakarma (pre-procedure preparation). Charaka Samhita documents Devadaru-containing steam decoctions for Vata-Kapha conditions requiring deep channel opening before the main Panchakarma procedure.