When herbs are prepared for skincare, the extraction medium matters just as much as the plant itself.

Water, oils, alcohol, and ghee all pull out different types of compounds from botanical material. This is why the same herb can behave very differently depending on how it is prepared. A water-based tea, a tincture, and a herbal oil infusion may all come from the same plant, yet each contains a different profile of constituents.

Ayurveda understood this practically long before modern chemistry described it scientifically. Classical lipid preparation methods such as Sneha Kalpana were built around the recognition that oils and ghee extract compounds that water alone cannot capture effectively.

This distinction is important because it helps explain why lipid-based preparations feel and behave differently on the skin than water-based extracts do.

The Principle Behind Extraction

At the center of all extraction methods is a simple principle: substances dissolve best into materials with similar chemical characteristics.

Water extracts water-soluble compounds. Oils and ghee extract fat-soluble compounds.

In modern chemistry, these are often described as hydrophilic compounds, which dissolve more easily in water, and lipophilic compounds, which dissolve more easily in fats and oils.

Water tends to extract compounds such as sugars, tannins, certain alkaloids, and many of the constituents associated with bitter or astringent qualities in plants.

Lipids, on the other hand, are especially effective at extracting:

• aromatic compounds,
• resins,
• waxes,
• pigments,
• terpenoids,
• phytosterols,
• and other fat-soluble constituents.

This does not make one extraction method better than the other. They simply produce different preparations with different characteristics.

Why Lipid Extraction Matters for Skincare

This difference becomes especially important when preparing products intended for the skin.

The skin's outermost protective layer is itself rich in lipids. It contains fatty substances, ceramides, cholesterol, and wax-like materials that help maintain barrier function and reduce excessive moisture loss.

Because of this, many fat-soluble botanical compounds are well suited to lipid-based skincare systems.

Certain pigments, aromatic compounds, and plant sterols extracted into oils are structurally more compatible with the skin's lipid environment than many water-soluble compounds alone. This is one reason oil-based preparations often create a richer, more cushioning skin feel.

Ayurveda may not have described this using the language of modern barrier science, but the practical understanding was clearly present in the way oils and ghees were used throughout classical formulation methods.

What Actually Happens During Extraction

When herbs are introduced into oil or ghee, extraction begins gradually through contact and diffusion.

At first, the concentration of fat-soluble compounds inside the plant material is much higher than in the surrounding lipid. Over time, these compounds begin moving outward into the oil, where the concentration is lower.

This process happens naturally, but slowly.

That is why passive oil infusions often require weeks to produce meaningful extraction. Under room-temperature conditions, much of the plant structure remains intact, limiting how quickly compounds can move into the lipid medium.

Heat changes this dramatically.

Why Heat Improves Lipid Extraction

In classical Sneha Kalpana, herbs are processed under slow and controlled heat rather than left in passive infusion alone.

Heat helps extraction in several ways.

First, it softens and disrupts plant cell walls, making internal compounds more accessible to the surrounding oil or ghee. Many important botanical constituents remain trapped inside plant structures until heat helps release them.

Second, warming the oil reduces its viscosity, allowing it to move more freely and interact more thoroughly with the herbal material.

Together, these changes create a much deeper level of extraction than cold maceration alone typically achieves.

This is one reason traditionally prepared Ayurvedic oils often develop such strong aroma, rich color, and integrated texture. The oil is not simply carrying herbs alongside it. It has gradually absorbed compounds from the plant material through sustained interaction over time.

Why the Herbal Paste Matters

Another important part of Sneha Kalpana is the use of Kalka, the finely ground herbal paste prepared before cooking begins.

Grinding herbs into a smooth paste increases the surface area exposed to the oil and water phases during preparation. The finer the plant material, the greater the contact between the herbs and the surrounding extraction medium.

This improves extraction efficiency significantly.

A coarsely chopped herb releases compounds much more slowly than the same herb processed into a fine paste. Ayurveda treated this as an important part of the method rather than a minor preparatory detail.

The Kalka also helps maintain prolonged contact between the plant material, the oil, and the liquid phase during cooking, allowing extraction to continue more thoroughly over time.

Why Sneha Kalpana Uses Both Water and Lipids

One of the more sophisticated aspects of classical Ayurvedic preparation is that full Sneha Kalpana combines both water-based extraction and lipid-based extraction within the same process.

The liquid decoction, or Drava, helps extract water-soluble compounds early in the preparation. Meanwhile, the oil or ghee absorbs fat-soluble constituents during cooking.

As the water gradually evaporates away, the preparation becomes increasingly concentrated within the lipid phase itself.

This creates a broader and more integrated extraction than oil infusion alone.

In modern terms, Sneha Kalpana functions almost like a multi-phase extraction system where water and lipids each contribute different parts of the botanical profile before the preparation settles into its final oil-based form.

That level of formulation thinking remains remarkably sophisticated even today.

The Oil Itself Matters Too

Ayurvedic preparation methods also recognized that the lipid medium itself contributes to the final preparation.

The oil or ghee is not merely an inactive carrier. Different lipids behave differently during extraction and create different sensory experiences on the skin afterward.

Sesame oil, for example, was commonly used partly because of its relative stability under heat and its ability to tolerate prolonged cooking. Ghee was valued for its richness, compatibility, and nourishing qualities within Ayurvedic thought.

For us, this is one reason whole-herb lipid infusions remain so meaningful. The relationship between the herbs and the lipid base develops gradually during preparation, creating formulations that feel more integrated and considered than products built primarily around isolated extracts added afterward.

A More Thoughtful Way of Working With Plants

Modern skincare often focuses heavily on ingredient identity — which botanical is included, what active percentage is used, or which extract appears on the label.

But extraction method changes the preparation itself.

A herb extracted into water behaves differently from that same herb extracted into oil or ghee. The chemistry changes. The sensory profile changes. The way the preparation feels on the skin changes.

Traditional Ayurvedic lipid preparation methods remind us that formulation is not only about ingredients in isolation. It is also about understanding how materials interact, transform, and develop through process over time.

In many ways, this is what makes Sneha Kalpana still feel so relevant today. It approaches botanical skincare not as simple ingredient assembly, but as a slower and more integrated system of preparation built around nourishment, compatibility, and thoughtful formulation.

Citations

• 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.
• Elias, Peter M. "Skin Barrier Function." Current Allergy and Asthma Reports, vol. 8, no. 4, 2008, pp. 299–305.
• Madison, Katie C. "Barrier Function of the Skin: 'La Raison d'Être' of the Epidermis." Journal of Investigative Dermatology, vol. 121, no. 2, 2003, pp. 231–241.
• Chemat, Farid, et al. "Applications of Ultrasound in Food Technology: Processing, Preservation and Extraction." Ultrasonics Sonochemistry, vol. 18, no. 4, 2011, pp. 813–835.
• 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.