The Real Story of Turmeric: From a Kitchen Spice to the Laboratory of Modern Science

Turmeric had always been a familiar part of Indian kitchens. It had been used to add colour to curries, enhance the appearance of food, and as part of traditional practices passed down through generations. But few could have imagined that hidden within this bright yellow spice were molecules that would one day capture the attention of researchers around the world. The most famous among them is curcumin.

But the story of curcumin is not simply “turmeric contains curcumin.” It is a much bigger scientific journey.

Turmeric → Molecule → Pharmacology → Bioavailability → Drug Delivery

And this is the story behind that journey.

1815: When Turmeric Entered the World of Chemistry

In 1815, Vogel and Pelletier isolated a yellow-coloured substance from the rhizome of Curcuma longa. That substance would later become known as curcumin.

However, the material isolated during those early experiments was not the same as the highly purified curcumin preparations used in modern laboratories. Over the following decades, researchers continued to investigate its chemical properties. In 1842, Vogel Jr. obtained a more purified preparation. Later, in 1910, the chemical structure of curcumin was identified as diferuloylmethane. In 1913, its synthesis was also reported. This marked an important change in the story. Turmeric was no longer being looked at only as a plant or spice. One of its constituents had become a specific chemical compound that could be isolated, studied and synthesised in a laboratory.

Turmeric Was More Than Curcumin

This is where the story gets even more interesting. Turmeric does not contain just one molecule. Some of the major curcuminoids found in turmeric include:

• Curcumin
• Demethoxycurcumin
• Bisdemethoxycurcumin

In simple terms:

Turmeric ≠ Pure Curcumin

Turmeric is a whole plant material. Curcumin is one of its major chemical constituents. Understanding this distinction is important because the biological effects of a whole food or plant cannot always be explained by a single molecule alone.

Then the Laboratory Asked: “What Does This Molecule Do in the Body?”

Over the following decades, laboratory, cellular, animal, and human studies on curcumin continued to grow. Numerous studies investigated its biological activities, including antioxidant and anti-inflammatory properties. This naturally led to another question:

“Could a molecule with this kind of biological activity have potential therapeutic applications?”

This marked the beginning of another major chapter in the story of curcumin research. But Curcumin Had a Major Challenge. A molecule showing biological activity in a laboratory is one thing. Getting that molecule into the body through oral consumption and reaching the required concentration is another. One of the major challenges associated with curcumin is its poor oral bioavailability.

Several factors may contribute to this, including low water solubility, limited intestinal permeability, instability in an alkaline environment, and metabolism occurring in the intestinal wall and liver.

This created a fascinating paradox: A promising molecule in the laboratory. But significant limitations when it enters the body. This is known as the bioavailability problem in pharmacology.

Then Scientists Asked: “Can Curcumin Be Made More Available?”

This is where a small molecule found in black pepper began to attract significant attention, Piperine. In a well-known study published in 1998, researchers reported that taking piperine along with curcumin significantly increased the relative bioavailability of curcumin in humans. In that study, 20 mg of piperine was administered along with 2 g of curcumin, and an approximately 2000% increase in relative bioavailability was reported.

This finding opened the door to a much larger field of research into the combination of curcumin and piperine. But there is an important point to remember.

A 2000% increase does not mean that curcumin will provide 20 times greater therapeutic effects. It refers to the measured increase in relative bioavailability reported in that particular study. It cannot be directly interpreted as a proportional increase in clinical benefits.

Later reviews have also highlighted the potential of piperine to enhance curcumin bioavailability. However, more high-quality clinical research is still needed to fully understand its significance.

Piperine Wasn’t the Only Answer

Scientists began exploring several other ways to address curcumin's bioavailability challenges.

These included:

• Lipid-based formulations
• Micelles
• Liposomes
• Nanoparticles
• Nano and micro-emulsions
• Solid dispersions
• Other drug-delivery systems

The goal was essentially the same:

Can we find better ways to deliver curcumin into the body?

This shifted curcumin research beyond the study of a plant compound and into the much broader field of drug-delivery science.

Modern Science Wasn’t the Beginning of Turmeric’s Story

Long before modern science began studying curcumin’s bioavailability, turmeric, known as Haridra in traditional Indian systems, had already been used in different forms.

In many traditional preparations, turmeric was not used as a single isolated molecule. Instead, it was used as part of a whole-drug preparatio, often alongside other ingredients. Some traditional formulations also included ingredients such as black pepper.

Lipid-containing ingredients such as milk and ghee can also be found in traditional Indian food and medicinal preparations. This creates an interesting point of comparison with modern research.

However, it would be scientifically excessive to say that “Ayurveda had already discovered the science of bioavailability.”

The historical use of traditional formulations and the pharmacokinetic mechanisms studied by modern science are not automatically equivalent. Establishing a direct connection requires specific scientific studies.

Still, an important question remains:

Could the way traditional formulations combined ingredients offer interesting areas for modern research?

Absolutely.

Another Route for Curcumin: Local Delivery

Scientists eventually began asking another important question:

“What if curcumin doesn't need to reach the entire body?”

If bioavailability is a challenge with oral delivery, what about local delivery? Topical application, particularly for the skin, became another area of research.

Clinical studies have explored topical applications of turmeric and curcumin.

A 2016 systematic review evaluated clinical evidence surrounding topical and oral turmeric/curcumin use, while later reviews, including those published in 2023, examined human clinical studies involving topical curcumin.

Some promising findings have been reported for certain dermatological conditions. However, the strength of evidence is not the same across all conditions, and further research is still needed.

This brings us to an important principle in science:

“There is research” does not mean “it is a proven treatment for every condition.”

That is the beauty of science, Say only as much as the evidence supports.

A Fascinating Chapter from Kerala

While researchers around the world were exploring ways to overcome curcumin’s bioavailability challenges, researchers at the Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), in collaboration with ICMR, also explored curcumin delivery.

One notable area of research involved a: Fibrin wafer/disc as a biological carrier for sustained delivery of curcumin.

The technology explored incorporating curcumin into a fibrin-based wafer or disc to enable local and sustained delivery.

This technology was granted US Patent 10,004,698 in 2018, with SCTIMST and ICMR listed as applicants.

SCTIMST records also document a patent application related to “Development of Soluble Albuminated Curcumin for Application in Cancer Therapy,” developed through SCTIMST-ICMR collaboration.

These developments should not be presented as established clinical cancer treatments. Their significance lies elsewhere.

They show just how far curcumin research has travelled into the world of drug-delivery technology.

So, What Is the Real Story of Turmeric?

Once, it was simply a kitchen spice.

Then it became a yellow compound studied by chemists.

Then came the identification of a molecular structure.

Then came pharmacological research.

Then came the bioavailability problem, Then piperine.

Then lipid-based formulations

Nanotechnology.

Topical delivery.

Local delivery.

Drug-delivery systems.

And so the journey continued.

From turmeric to a molecule.
From a molecule to medicine research.
From medicine research to delivery science.

It is the story of how something familiar in our kitchens became the subject of sophisticated research in modern laboratories.

The Science Hidden Behind a Simple Yellow Spice

But there is another important lesson hidden within this story.

Reducing a plant to a single molecule is one way of looking at it through the lens of science. Understanding the whole plant is another.

Modern pharmacology asks:

“What is the active molecule?”

Pharmacokinetics asks:

“How much of it actually reaches the body?”

Drug delivery asks:

“How can we deliver it to where it is needed?”

Traditional medicine asks:

“How was this substance traditionally used, in what form, and alongside which ingredients?”

Each question represents a different part of the same story.

And that is why the story of turmeric is far from over.

Curcumin is not simply a molecule from an old story. It remains a molecule at the centre of ongoing scientific research.

That is the real scientific story behind turmeric’s golden colour.

A Note on the Science

Curcumin has been the subject of extensive research into various pharmacological activities. However, laboratory and animal findings should not automatically be interpreted as evidence of disease treatment in humans.

Clinical outcomes can vary depending on the condition, formulation, dose, study design and several other factors. Science moves forward not through claims, but through evidence.

From Scientific Understanding to Curcumeal

The scientific journey of curcumin had also inspired new ways of thinking about how turmeric could be incorporated into everyday life.

One such example was Curcumeal, developed by Geethas as a turmeric-based super food with a focus on better curcumin absorption. Its formulation had been guided by the growing scientific understanding of turmeric, curcumin and bioavailability.

Curcumeal had been formulated with the support of food scientists associated with ICAR, bringing scientific expertise into the development of a product designed to make turmeric easier to include in a daily food routine. The product had also been associated with the ICAR-Indian Institute of Spices Research (IISR) as an off-campus incubatee.

The idea behind Curcumeal reflected one of the central questions that had shaped decades of curcumin research:

How could turmeric be made easier to include in everyday life, while supporting better curcumin absorption?

Rather than looking at turmeric only as a source of an isolated molecule, Curcumeal had brought turmeric together with carefully selected food ingredients in a science-guided formulation.

This journey had also received recognition from the National Turmeric Board of India, highlighting Geethas work in turmeric-based food innovation and its connection to high-curcumin turmeric.

In that sense, Curcumeal represented another chapter in the much longer story of turmeric:

From a traditional spice → to a scientifically studied molecule → to research into bioavailability → and finally to super food innovation designed around everyday use.

The science behind turmeric had continued to evolve. And so had the ways in which it could be brought into everyday life.