Why Ratios Matter in Ayurvedic Formulation

In Ayurveda, a formulation is not defined only by the ingredients it contains. The proportions of those ingredients matter just as much.

This becomes especially clear in Sneha Kalpana, the classical Ayurvedic method of preparing medicated oils and ghees. Traditional texts do not describe these preparations casually or approximately. The relationships between the lipid base, herbal paste, and liquid component are documented with surprising precision, reflecting a system that understood formulation as both practical and deeply process-oriented.

These ratios were not treated as arbitrary measurements. They were understood as functional principles that shaped extraction, stability, texture, and the overall character of the finished preparation.

That level of attention still feels striking today, especially in a skincare industry where ingredient lists often receive far more focus than the preparation methods themselves.

The Three Components of Sneha Kalpana

Classical Sneha preparations are built around three core components:

• Sneha — the lipid base,
• Kalka — the herbal paste,
• and Drava — the liquid medium.

Each serves a different role within the preparation.

The Sneha may be sesame oil, coconut oil, ghee, or another lipid chosen according to the intended use of the formula. It acts as the structural base that ultimately retains the extracted fat-soluble compounds.

The Kalka is a finely ground herbal paste. This is the main source of plant material within the preparation and remains in close contact with both the oil and liquid phases during cooking.

The Drava is usually an herbal decoction or water-based liquid that helps extract water-soluble compounds and supports interaction between the different phases during heating.

Together, these components form a highly integrated preparation system rather than a simple infusion.

The Classical Ratio

One ratio appears consistently throughout the major Ayurvedic texts:

• one part Kalka,
• four parts Sneha,
• and sixteen parts Drava.

This 1:4:16 ratio is referenced across sources including the Ashtanga Hridayam and discussions of medicated oil preparation in the Charaka Samhita.

At first glance, the amount of liquid may seem excessive compared to the amount of oil. But the ratio becomes much more logical when viewed through the lens of extraction.

Water and lipids pull out different types of plant compounds. The large liquid phase allows water-soluble constituents to be extracted early in the cooking process, while the oil or ghee gradually absorbs fat-soluble compounds over time.

As heating continues, the water evaporates slowly, leaving behind a lipid preparation enriched through prolonged interaction with both phases.

This is one of the more sophisticated aspects of classical Ayurvedic formulation. The preparation is designed not only to combine ingredients, but to create layered extraction through controlled transformation.

Why the Herbal Paste Matters So Much

Although the Kalka appears in the smallest proportion by volume, it plays a central role in the process.

The herbs are ground into a fine paste to increase surface area and improve contact between the plant material and the surrounding oil and liquid. This helps support more thorough extraction during cooking.

But the Kalka does more than simply hold the herbs inside the preparation. Throughout the heating process, it acts almost like a bridge between the water phase and the lipid phase, allowing sustained interaction between them over time.

Classical Ayurvedic texts also describe the behavior of the Kalka as one of the primary indicators of whether a preparation has been completed properly. Practitioners observed changes in texture, consistency, aroma, and the behavior of the residual paste to judge when the oil had reached its finished state.

This reflects how closely preparation itself was observed within Ayurvedic pharmaceutics.

Why Ratios Were Adjusted

Although the 1:4:16 ratio appears frequently, classical texts also describe variations depending on the herbs being used and the intended nature of the preparation.

Some formulations increased the proportion of Kalka to create denser, more concentrated oils with stronger botanical presence. Others adjusted the amount of liquid depending on how readily certain herbs released their constituents during cooking.

More resinous or difficult plant materials sometimes required longer processing or modified ratios to achieve proper extraction.

There were also simpler oil infusions that used reduced liquid phases or bypassed full Sneha Kalpana methods altogether. Importantly, Ayurveda distinguished these preparations separately rather than treating them as incomplete versions of the same process.

That distinction matters because it shows that classical practitioners understood different preparation categories clearly. The methods were intentional, not improvised.

What These Ratios Reveal About Ayurvedic Thinking

One of the most interesting things about these traditional ratios is what they reveal about Ayurvedic formulation philosophy itself.

Long before modern analytical chemistry existed, Ayurvedic preparation methods already reflected a practical understanding that:

• different solvents extract different compounds,
• extraction efficiency depends on proportion,
• and preparation conditions shape the final outcome.

The ratios encode this understanding directly into the process.

Ayurveda may not have described extraction using terms like hydrophilic or lipophilic, but the functional logic was remarkably advanced. Water extracted one set of botanical properties. Oils and ghee extracted another. Combining them through heat created a more integrated preparation than either phase alone could produce.

This is part of why Sneha Kalpana continues to feel so relevant today. It approaches formulation as a relationship between ingredients, medium, proportion, and process rather than simply a list of components.

A More Thoughtful Approach to Formulation

Modern skincare often prioritizes ingredient novelty and isolated actives, but traditional Ayurvedic preparation methods remind us that formulation is also shaped by proportion, interaction, and preparation style.

For us, this is one reason whole-herb lipid infusions remain so meaningful. The balance between herbs, lipids, and preparation methods influences not only the chemistry of a formulation, but also how it feels on the skin over time. Richer lipid systems prepared slowly and intentionally often create a calmer and more comfortable skin experience than formulations built entirely around intensity or rapid visible activity.

Traditional Sneha ratios reflect this broader philosophy. They show that Ayurvedic formulation was never simply about adding herbs into oil. It was a disciplined system designed around balance, transformation, and long-term stability.

In many ways, these preparation methods still offer an important reminder for modern skincare: thoughtful formulation depends not only on what ingredients are chosen, but on how they are proportioned, prepared, and allowed to work together over time.

Citations

• Vagbhata. Ashtanga Hridayam. Translated by K. R. Srikantha Murthy, Chaukhambha Krishnadas Academy, 2007.
• Sharma, Ram Karan, and Bhagwan Dash, translators. Charaka Samhita. Vol. 6, Chowkhamba Sanskrit Series Office, 2009.
• Harborne, Jeffrey B. Phytochemical Methods: A Guide to Modern Techniques of Plant Analysis. 3rd ed., Springer, 1998.
• Handa, S. S., et al. Extraction Technologies for Medicinal and Aromatic Plants. International Centre for Science and High Technology, 2008.
• Azwanida, N. N. "A Review on the Extraction Methods Use in Medicinal Plants, Principle, Strength and Limitation." Medicinal & Aromatic Plants, vol. 4, no. 3, 2015, pp. 1–6.