Why Ashwagandha Is Called a Rasayana
The word rasayana is often translated as "rejuvenator". The classical meaning is more precise, and more interesting.
In the classical texts, rasayana is not a category of tonic. It is a branch of medicine — one of the eight limbs of Ashtanga Ayurveda — concerned with what happens to a body over time.
What the texts actually say
Charaka describes rasayana as that which brings about the best qualities of the tissues. The emphasis is on how well the body converts what it takes in, not on stimulation.
Where ashwagandha sits
Ashwagandha is classified as a balya (strength-giving) and rasayana herb. Modern research has focused on its withanolides and their relationship with cortisol regulation — which maps closely onto the traditional description of a herb for someone depleted by overwork.
How it is traditionally taken
The root, not the leaf. Powdered, taken with warm milk at night. The milk matters — the withanolides are fat-soluble.
A note on sourcing: withanolide content varies with soil, altitude and drying method. Shade-drying preserves considerably more than sun-drying.