Rasayana can be behavioral or herbal.
When defined as the science of promoting longevity, rasayana includes
nourishing foods, meditation, yogic practices and other positive
behaviors such as kindness and honesty.
In alchemy, rasayana therapy refers to herbal
remedies that, among other things, fight disease, promote long
life, improve memory and improve complexion. A typical herbal
preparation includes 10 to 20 different herbs mixed with fruits or
minerals. It can be administered in a variety of forms from pastes,
tinctures, powders, teas and pills.
There are two main categories of
rasayana: kamya rasayana, which promotes health by boosting energy
levels and healthy lifestyle; and naimittika rasayana,
which fights disease. Kamya rasayana is divided into three categories: pranakamya (promotes
vitality and longevity), srikamya (supports complexion) and
medhakamya (boosts intelligence).
Rasayana is further classified as drug-based (aushdha rasayana), dietary (ahara rasayana) and lifestyle (achara rasayana).