Five Methods of Herbal Preparation

Ayurvedic pharmacy does not treat all herbs the same way. Each plant has its own structure -- roots that need sustained boiling to release their compounds, flowers whose delicate aromatics evaporate the moment they touch heat, leaves best juiced raw. The five methods of herbal preparation (Pancha Kashaya) are the classical answer to this variety.

The five forms are: fresh juice (Swarasa), paste (Kalka), decoction (Kwatha or Kashaya), hot infusion (Phanta), and cold infusion (Hima). Together they cover the full range of extraction conditions -- from raw and cold to long-boiled -- ensuring that each herb is processed in the way that best preserves its therapeutic character.

These five methods are described systematically in the Sharangadhara Samhita, one of the foundational texts of Ayurvedic pharmaceutics. Every compound formula in classical Ayurveda specifies which of these forms to use, making the Pancha Kashaya a kind of decision framework that practitioners apply before preparing any herbal medicine.

Fresh Juice (Swarasa)

The most direct extraction: the raw herb is crushed and its juice expressed without any added water or heat. Swarasa retains the full spectrum of volatile and water-soluble constituents exactly as they exist in the living plant. It is used when maximum freshness and potency are required.

Paste (Kalka)

The herb is ground with a small amount of water into a thick, uniform paste. Kalka is used directly as a preparation or as an ingredient within compound formulas. It is slower to release its constituents than juice but easier to combine with other materials.

Decoction (Kashaya)

The herb is boiled in water -- often in a ratio of 1 part herb to 16 parts water -- until the liquid reduces to one quarter of its original volume. Kashaya is the workhorse of Ayurvedic pharmacy, suited to dense materials like roots, bark, and seeds that require sustained heat to release their active compounds.

Hot Infusion (Phanta)

Freshly boiled water is poured over the herb and steeped briefly before straining. Phanta is gentler than a decoction, suited to aromatic herbs and flowers whose volatile oils would dissipate with prolonged boiling.

Cold Infusion (Hima)

The herb is soaked in unheated water for an extended period, typically overnight. Hima is reserved for herbs with cooling, demulcent properties where heat would diminish the intended therapeutic effect.

When an Ayurvedic practitioner selects a herb, the next decision is always: which of the five methods do I use? The choice is guided by the herb's physical nature, its heat sensitivity, and the condition being treated.

Dense, fibrous materials -- roots, bark, seeds, minerals -- need the sustained heat of a decoction (Kashaya) to yield their compounds. Delicate flowers and aromatic leaves are better served by a hot infusion (Phanta), where brief steeping preserves volatile constituents. Fresh herbs that are juicy and available locally are best consumed as expressed juice (Swarasa), which loses no potency to processing. Herbs with cooling, mucilaginous properties are soaked overnight as a cold infusion (Hima). Paste (Kalka) serves when topical application or direct ingestion of the whole herb is needed.

In compound formulas, different ingredients within the same preparation may be processed by different methods and then combined. This reflects a sophisticated understanding that different parts of a plant, or different herbs within a formula, have different optimal extraction conditions.

The Pancha Kashaya framework is taught early in Ayurvedic education because it underlies all pharmaceutical preparation. A practitioner who understands these five methods can assess any classical formula intelligently and adapt it when fresh herbs are unavailable or when a patient cannot tolerate a particular form.

• Cold Infusion (Hima) -- One of the five methods, explored in depth. The gentlest extraction, suited to cooling and demulcent herbs.
• Herbal Formulation (Yoga Kalpana) -- Classical formulas specify which of the five methods to use for each ingredient. The Pancha Kashaya is the tool set; Yoga Kalpana is the design framework that applies it.
• Anupana (Carrier Substances) -- After preparation, the resulting medicine is taken with a carrier. The extraction method and the carrier together determine how effectively the medicine reaches its target.
• Vati (Pills and Tablets) -- A solid dosage form whose powdered ingredients are often processed through one of the five methods before compounding into pill form.