Rasāyana, रसायन is a Sanskrit word, with literal meaning: Path (āyana) of essence (rasa). It is a term that in early ayurvedic medicine means the science of lengthening lifespan, and in later (post 8th-century) works sometimes refers to Indian alchemy. The name of the science of Indian alchemy or proto-chemistry, is more generally `Th....
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http://en.wikipedia.org/wiki/Rasayana
Herbs, foods, or behaviors that support immunity, good health, and long life; that which causes ojas to be produced.
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http://www.encyclo.co.uk/local/22150
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