The Science of Amla: Chemical Constituents of Phyllanthus emblica

Part of the OmVeda Botanical Library, this article explores the science of Amalaki, the Indian gooseberry (Phyllanthus emblica): the natural compounds inside the fruit, how they work together, and what laboratory research has found so far.

In Part 1 of our Amla series, we explored how Ayurveda has understood Amalaki for thousands of years: its five tastes, its cooling energy and its place as one of the most celebrated Rasayanas. In this second part, we look at the same fruit through a different lens, that of modern plant chemistry.

What makes this small, sour fruit so interesting to researchers? The answer lies in its unusually rich and complex chemistry.

The Chemistry of Amla: An Overview

Amla fruit contains a wide range of naturally occurring plant compounds, known as phytochemicals. A 2023 review in Frontiers in Pharmacology grouped the main constituents into several families:

• Hydrolysable tannins (ellagitannins): emblicanin A and B, punigluconin, pedunculagin, geraniin, corilagin, chebulagic acid and chebulinic acid
• Phenolic acids: gallic acid, ellagic acid, chebulic acid and chlorogenic acid
• Flavonoids: quercetin, kaempferol and rutin
• Vitamin C (ascorbic acid)
• Other constituents: organic acids such as malic acid, plant sterols, alkaloids (phyllantidine and phyllantine) and fatty acids including linoleic, oleic and palmitic acid

It is the combination of these compounds, rather than any single one, that gives Amla its characteristic sour, astringent taste and much of its interest to science.

Hydrolysable Tannins: Amla's Signature Compounds

The most distinctive group of compounds in Amla are the hydrolysable tannins, a family of polyphenols built around a sugar core (usually glucose) with gallic acid or ellagic acid units attached. When these tannins break down, they release gallic acid and ellagic acid.

Emblicanin A and B

Emblicanins are ellagitannins that have been described in Amla fruit and are often discussed as among its key antioxidant compounds. They are particularly associated with Amla's ability to neutralise free radicals in laboratory tests.

Punigluconin, Pedunculagin and Geraniin

These related ellagitannins are also found in other plants, such as pomegranate. In Amla, they contribute to the fruit's overall polyphenol content and astringency.

Corilagin, Chebulagic Acid and Chebulinic Acid

Interestingly, chebulagic and chebulinic acid are also characteristic of Haritaki (Terminalia chebula), another of the three Triphala fruits. This shared chemistry is one of the ways modern science echoes the traditional pairing of these fruits, as in our Ayurvedic Hair Tonic, which brings Amla, Haritaki and Bahera together.

Phenolic Acids: Gallic Acid and Ellagic Acid

Gallic acid is one of the most abundant simple phenolic compounds in Amla. It is a small molecule with three hydroxyl (-OH) groups on a benzene ring, a structure that makes it an effective free-radical scavenger in laboratory assays.

Ellagic acid is formed when two gallic acid units link together. It is a well-studied antioxidant also found in berries, pomegranate and walnuts.

Because the tannins in Amla release gallic and ellagic acid as they break down, these two compounds are often used as reference markers when researchers test the quality and consistency of Amla extracts.

Flavonoids: Quercetin, Kaempferol and Rutin

Amla also contains flavonoids, a large family of plant pigments and antioxidants. Quercetin and kaempferol are among the most widespread flavonoids in the plant kingdom, and rutin is a form of quercetin bound to a sugar. They are present in smaller amounts than the tannins, but add to the fruit's overall polyphenol profile.

Vitamin C in Amla: Fact and Debate

Amla is famous as one of the richest natural sources of vitamin C. Published figures for fresh fruit commonly range from about 600 to 1,300 mg per 100 g, many times higher than an orange.

However, the picture is more nuanced than it first appears:

• Values vary widely depending on the variety, ripeness, growing conditions and how the fruit is processed and stored.
• Vitamin C is fragile. It breaks down with heat, light and drying, so dried Amla powder and processed extracts may contain far less than the fresh fruit.
• Measurement can be tricky. Some researchers and ingredient suppliers have questioned whether certain older tests overstated Amla's vitamin C, because common testing methods can also react with other antioxidants, including tannins.

Many researchers now suggest that Amla's tannins and polyphenols, working alongside its vitamin C, are responsible for much of its antioxidant activity. Some have also proposed that the tannins may help protect the vitamin C in the fruit, although this remains a subject of discussion.

What Has Research Found?

Amla has been the subject of a large and growing body of research. It is important to understand that most of this work has been carried out in the laboratory, on cells or with isolated compounds, rather than in people. These studies help scientists understand how a plant's compounds behave, but they do not prove that a product will have a particular effect on the body or skin.

Antioxidant Activity

The most consistent finding across studies is that Amla extracts and their isolated compounds show strong antioxidant activity in standard laboratory tests (such as the DPPH, ABTS and FRAP assays). In a 2017 study, researchers isolated seven phenolic compounds from Amla fruit, including a newly identified one, and all seven showed potent antioxidant activity in these tests.

Collagen and Skin Cells

A 2008 laboratory study published in the Journal of Ethnopharmacology looked at the effect of an Amla fruit extract on human skin fibroblasts, the cells that produce collagen. The researchers observed that the extract was associated with increased production of procollagen (the precursor to collagen) and reduced levels of MMP-1, an enzyme that breaks collagen down.

Pigmentation Research

In the 2017 study mentioned above, some of the phenolic compounds isolated from Amla moderately reduced melanin production in pigment cells in the laboratory. Gallic acid, one of Amla's main phenolic acids, has also been studied in this area. Again, these are early cell-based findings.

Other Areas of Study

Researchers have also investigated Amla's compounds in relation to inflammation, microbial activity and many other areas. A 2023 review in Frontiers in Pharmacology summarises this research and notes that, while results are promising, more well-designed human studies are needed.

Why Whole-Fruit Amla Matters

One of the most interesting themes in Amla research is that no single compound tells the whole story. The tannins, phenolic acids, flavonoids and vitamin C exist together in the fruit, and their combined effect in laboratory tests is often greater than any one compound alone.

This idea sits comfortably with the Ayurvedic approach, which has always used the whole fruit, as a powder, an oil infusion or a fresh preparation, rather than isolating individual compounds. It is one of the reasons we use Amla as a whole botanical in formulations such as our Amla Shampoo, Eye Awaken Gel and Refining Fennel Exfoliant.

Continuing Your Botanical Journey

This is the second part of our four-part Amla series. Next, in The Sacred Amla Tree, we follow the journey of the Amalaki tree through history. Still to come after that: Amla in Ayurvedic hair and skin care.

Frequently Asked Questions About the Science of Amla

What are the main active compounds in Amla?

Amla's best-known compounds are hydrolysable tannins (including emblicanin A and B, punigluconin, pedunculagin and corilagin), phenolic acids such as gallic acid and ellagic acid, flavonoids such as quercetin and kaempferol, and vitamin C.

Is Amla really high in vitamin C?

Fresh Amla fruit is widely reported to be rich in vitamin C, with published figures commonly between 600 and 1,300 mg per 100 g. Levels vary with variety and processing, and drying or heating reduces vitamin C. Some researchers have also questioned whether certain tests overstated the figure, because other antioxidants in Amla can affect the results.

Where does Amla's antioxidant activity come from?

Laboratory research suggests it comes from the combination of its tannins, phenolic acids, flavonoids and vitamin C, rather than any single compound.

Is the research on Amla done in people?

Most published research on Amla has been carried out in the laboratory, using cells or isolated compounds. These studies are valuable for understanding the plant's chemistry, but they are not the same as proof of an effect in people.

What is the botanical name for Amla?

Amla's botanical name is Phyllanthus emblica. It is also known by the older name Emblica officinalis.

References

• Prananda AT, Dalimunthe A, Harahap U, et al. Phyllanthus emblica: a comprehensive review of its phytochemical composition and pharmacological properties. Frontiers in Pharmacology. 2023;14:1288618.
• Fujii T, Wakaizumi M, Ikami T, Saito M. Amla (Emblica officinalis Gaertn.) extract promotes procollagen production and inhibits matrix metalloproteinase-1 in human skin fibroblasts. Journal of Ethnopharmacology. 2008;119(1):53–57.
• Zhang J, Miao D, Zhu WF, et al. Biological activities of phenolics from the fruits of Phyllanthus emblica L. (Euphorbiaceae). Chemistry & Biodiversity. 2017;14(12):e1700404.
• Majeed M, Majeed S, Pande A, Nagabhushanam K. Testing: Debunking the myth of vitamin C and amla. Cosmetics Business. 2021.

This article is for educational purposes and summarises published scientific research. It is not intended as medical advice, and the laboratory findings described do not indicate that any product will treat, prevent or cure any condition.