The Role of Rasayana Kalpana in Immunomodulation: A Scientific and Ayurvedic Review

Rasayana (rejuvenation) therapy in Ayurveda is traditionally prescribed to enhance Ojas (vital essence) and Vyadhikshamatva (disease-resistance). This review synthesizes classical Ayurvedic doctrine and modern clinical studies on Rasayana drugs and formulations with immunomodulatory effects. Ayurvedic texts (e.g. Charaka Samhita describe Rasayanas as Ojovardhaka (promoters of Ojas) that impart Vyadhikshamatva. Modern research has identified immune- enhancing activities of key Rasayana herbs. For example, Ashwagandha and Guduchi have been shown to raise antioxidant enzyme levels (↑SOD, ↓MDA) and modulate cytokines and immune cell profiles in human trials. Clinical studies also report symptom improvements in immunocompromised patients using Tinospora cordifolia extract. Emblica officinalis (Amalaki), rich in vitamin C and polyphenols, exhibits antioxidant and anti-inflammatory properties useful in immune defense. Traditional Rasayana preparations like Chyawanprash (containing Amalaki, Ashwagandha, etc.) have demonstrated immunostimulatory effects (e.g. enhanced NK cell activity and cytokine release) in clinical studies. This review underscores that Rasayana Kalpana (formulations) act via antioxidant, adaptogenic and immunoadjuvant mechanisms, supported by both classical texts and modern evidence, to modulate and strengthen host immunity.