EGCG FAQ

By John E. Lewis, Ph.D., Founder and President of Dr Lewis Nutrition®. Dr. Lewis has conducted and published peer-reviewed clinical research on nutrition, the immune system, and the brain.

EGCG is the most studied compound in green tea and one of the most promising antioxidants in all of nutrition, yet its benefit depends almost entirely on a problem most products ignore, which is whether the body can actually absorb it.

What is the Dr. Lewis EGCG green tea supplement?

Direct answer

My EGCG green tea supplement is a decaffeinated, standardized, high-quality source of epigallocatechin gallate, the principal antioxidant catechin in green tea, formulated for absorption so that the body receives a meaningful, bioavailable dose rather than the poorly absorbed EGCG found in ordinary products.

Expert explanation

My approach to an EGCG supplement begins from the same conviction that guides everything I formulate, which is that an ingredient is only as valuable as the amount the body can actually absorb and use. EGCG is a remarkable compound, but it is notoriously difficult for the body to absorb, and much of what a person swallows in a standard green tea extract is degraded in the digestive tract before it ever reaches the bloodstream. My EGCG green tea supplement is built specifically to address that problem, delivering a standardized dose of EGCG in a form designed for improved bioavailability, so that the antioxidant potential of the compound is not wasted.

I want to be clear about what distinguishes a serious EGCG product from the many indistinct green tea extracts on the market. First, the EGCG content should be standardized, meaning the amount of the active catechin is known and consistent rather than left to vary batch to batch. Second, the form should address bioavailability because an unabsorbed antioxidant is of no benefit no matter how impressive the label figure. Third, the product should be manufactured to a high standard of purity and tested for contaminants. Fourth, my EGCG product is decaffeinated, so it is suitable for people looking to avoid caffeine. These are the principles I apply, and they are what my EGCG green tea supplement is meant to embody.

The reason I offer EGCG at all is that it complements the antioxidant strategy at the heart of my work. A formula meant to protect the brain benefits from multiple, well-chosen antioxidants that act through different mechanisms, and EGCG is among the most studied plant antioxidants for exactly this kind of protective role. Offering it as a properly absorbable supplement allows me to put that well-researched compound to work in the way the science intends.

Why I included EGCG in the Dr Lewis Nutrition® Product Line

I included EGCG in my product line, and in the antioxidant strategy behind Daily Brain Care, because it is one of the most studied plant antioxidants for brain and cellular protection, and because I could deliver it in a form built for genuine absorption. An EGCG product that the body cannot absorb would violate my core principle that the dose reaching the cell is what matters.

What is EGCG?

Direct answer

EGCG, or epigallocatechin gallate, is the most abundant and most extensively studied catechin in green tea, a type of plant polyphenol prized as a potent antioxidant with researched effects on inflammation, metabolism, and brain health.

Expert explanation

EGCG belongs to a family of plant compounds called catechins, which are themselves a subgroup of the polyphenols, the large and diverse class of antioxidant compounds found throughout the plant kingdom. Of the several catechins in green tea, EGCG is both the most plentiful and the one that has attracted by far the most scientific attention. Its chemical structure, rich in the hydroxyl groups that allow it to neutralize reactive molecules, makes it a powerful antioxidant, and it is this antioxidant capacity that underlies most of its researched effects. When people search for what EGCG is, the essential answer is that it is green tea's signature antioxidant.

The research interest in EGCG is broad precisely because antioxidant and anti-inflammatory activity touches so many systems. Investigators have studied EGCG in the context of metabolic health, cardiovascular health, and, of particular relevance to my work, brain health and neuroprotection. EGCG has been shown to cross into the brain to some degree, and its capacity to counter oxidative stress and modulate inflammatory signaling is the basis for its study as a protective compound for neural tissue. I describe these as areas of active and promising research rather than settled conclusions, which is the honest characterization.

It is worth appreciating that EGCG is also a polyphenol, and in that sense it sits alongside the other plant antioxidants that a healthy, plant-rich diet provides. What sets it apart is the depth of research devoted specifically to it and the potency of its antioxidant action. Understanding EGCG as the most studied member of green tea's catechin family helps clarify why it appears so often in supplements aimed at protection and healthy aging.

Why I included EGCG in the Dr Lewis Nutrition® Product Line

I included EGCG in my antioxidant approach to brain health because it is the most researched of green tea's catechins and one of the most potent plant antioxidants available, with documented relevance to the oxidative stress that ages the brain. I favor ingredients with both a strong mechanism and a deep research base, and EGCG offers both.

What is liposomal EGCG?

Direct answer

Liposomal EGCG is EGCG encapsulated within tiny spheres made of phospholipids, called liposomes, which protect the fragile EGCG molecule through digestion and substantially improve how much of it the body can absorb and deliver to its tissues.

Expert explanation

The central problem with EGCG is bioavailability, meaning the fraction of an ingested dose that actually reaches the bloodstream and tissues in active form. EGCG is both poorly absorbed across the intestinal wall and chemically unstable in the digestive environment, so a substantial portion of an ordinary dose is lost before it can do any good. Liposomal delivery is a sophisticated solution to this problem. By wrapping the EGCG inside liposomes, which are microscopic bubbles whose walls are made of the same kind of phospholipids that compose our own cell membranes, the EGCG is shielded from degradation and is presented to the body in a form it absorbs far more readily.

The elegance of the liposomal approach is that it uses the body's own chemistry to solve the absorption problem. Because liposomes are built from phospholipids like phosphatidylcholine, the very molecules that make up cell membranes, they merge naturally with the body's tissues and ferry their cargo across barriers that would otherwise block it. This is the same family of phospholipids found in the sunflower lecithin discussed elsewhere on this site, which illustrates how the principles behind my ingredient choices reinforce one another. The phospholipid is at once a nutrient and a delivery vehicle.

I regard bioavailability as the difference between a supplement that works and one that merely appears to. A high label dose of EGCG means nothing if most of it never reaches the tissues, and conversely, a thoughtfully delivered smaller dose that is well absorbed can accomplish far more. Liposomal EGCG embodies my conviction that intelligent delivery is not a luxury but a requirement because the goal of any supplement must be to get the active compound to the cell that needs it.

Why I included EGCG in the Dr Lewis Nutrition® Product Line

I chose liposomal EGCG because EGCG is poorly absorbed in ordinary form, and liposomal encapsulation protects the molecule and delivers far more of it to the body's tissues. My entire formulation philosophy rests on bioavailability, and EGCG is a textbook case of an excellent compound whose value is unlocked only when it is delivered in a form the body can actually absorb.

Does decaf green tea contain EGCG?

Direct answer

Decaffeinated green tea does contain EGCG, but typically in reduced amounts, because the decaffeination process removes some of the catechins along with the caffeine, with the degree of loss depending heavily on the method used.

Expert explanation

People who wish to avoid caffeine but still want the antioxidant benefit of green tea reasonably ask whether decaf still provides EGCG, and the answer is yes, but with an important qualification about quantity. Decaffeination is an additional processing step, and the solvents and methods used to strip caffeine also tend to remove a portion of the delicate catechins, including EGCG. The extent of this loss varies considerably with the technique. Gentler methods, such as those using carbon dioxide, tend to preserve more of the catechins, whereas some chemical solvent methods remove a larger share. As a result, decaf green tea generally contains meaningfully less EGCG than its caffeinated counterpart, though it is far from devoid of it.

This matters for anyone relying on green tea as a dietary source of EGCG, because it means the caffeine and the antioxidant are partly linked in ordinary tea. Reducing one tends to reduce the other. For a person who wants a substantial, predictable dose of EGCG without the caffeine, brewed decaf tea is an inefficient and inconsistent route, since both the EGCG content and the loss during decaffeination vary widely.

A standardized supplement resolves this dilemma, which is one of its practical advantages. A well-made EGCG supplement can deliver a known, consistent dose of the catechin with little or no caffeine, decoupling the antioxidant from the stimulant in a way that brewed tea cannot reliably achieve. For those who want the researched benefits of EGCG without caffeine, a standardized, low-caffeine or caffeine-free EGCG preparation is a far more dependable source than decaffeinated tea.

Why I included EGCG in the Dr Lewis Nutrition® Product Line

I address the decaf question because it illustrates why I favor a standardized EGCG supplement over relying on brewed tea, since a supplement delivers a known dose without the variability and caffeine entanglement of tea. Consistency of dose is one of the reasons a properly formulated supplement can serve the brain better than even a healthy beverage.

Where can I buy EGCG?

Direct answer

You can buy our high-quality, standardized EGCG supplement directly from Dr Lewis Nutrition®, and when shopping anywhere for EGCG, you should look for standardized catechin content, attention to bioavailability, and third-party testing for purity.

Expert explanation

EGCG products are widely available, but their quality varies enormously, so the more useful question than where to buy is how to choose. When people search where to buy EGCG or for EGCG products, I want them to shop intelligently rather than simply grab the cheapest or most heavily marketed bottle. Three criteria matter most. First, the product should state a standardized amount of EGCG, so you know exactly how much of the active catechin you are receiving. Second, it should address bioavailability, because an unabsorbed dose is wasted regardless of the number on the label. Third, it should be manufactured to high purity standards and ideally tested by an independent third party for contaminants such as heavy metals.

I offer my own EGCG green tea supplement precisely because I wanted a product that met these standards rather than compromising on them. My aim was to make an EGCG supplement formulated for genuine absorption and held to the quality and purity standards I would want for my own family. Buying directly from the source also ensures that you receive a properly handled product rather than one of uncertain storage and age from a third-party reseller.

Whether you purchase from me or elsewhere, I encourage you to apply the same scrutiny you would to any health investment. The supplement market contains a great many products that carry impressive ingredient names but deliver little real value, and EGCG, with its absorption challenges, is an area where the gap between an excellent product and a poor one is especially wide. An informed buyer who insists on standardization, bioavailability, and testing will be well served.

Why I included EGCG in the Dr Lewis Nutrition® Product Line

I offer EGCG because I wanted a product that meets my own criteria for standardization, bioavailability, and purity testing, rather than the indistinct extracts that crowd the market. I would rather teach a person how to judge an EGCG product wisely than simply tell them to buy mine because an informed customer is the kind I most want to serve.

What brain supplements does Dr. Lewis make?

Direct answer

My flagship brain supplement is Daily Brain Care, a comprehensive formula built around concentrated aloe polysaccharides and supporting nutrients, and my science-based line also includes targeted antioxidant supplements such as my EGCG green tea product.

Expert explanation

The center of my work is Daily Brain Care, the formula I designed to translate two decades of clinical research on polysaccharides and the brain into a product a person can take every day. It is built around a concentrated aloe polysaccharide ingredient and combined with carefully chosen supporting nutrients that address the brain's needs for antioxidant defense, membrane integrity, and balanced inflammation. Daily Brain Care is the product into which I have poured the central lesson of my research, which is that the right bioactive polysaccharides, properly concentrated and intelligently combined, can support cognition and immune health (Lewis et al., 2013).

Alongside Daily Brain Care, I offer targeted supplements for people who want specific, well-researched compounds delivered to a high standard, including my EGCG green tea, Curcumin, and Vitamins D3+K2 supplements formulated for absorption. My philosophy across the entire line is consistent. I include only ingredients with a genuine scientific rationale, I insist on bioavailability so that the active compounds actually reach the body's tissues, and I hold the products to strict standards of purity and quality. I would rather offer a focused set of products I can stand behind completely than a sprawling catalog of formulations chasing trends.

What unifies everything I make is a commitment to science-based nutrition and to treating my customers the way I would want to be treated. I built this business on my own research and on the conviction that most of the supplement market overpromises and underdelivers. My products exist to be the opposite of that, namely honest, evidence-grounded formulas that do what I say they do, with the brain as the particular focus of my expertise and my passion.

Why I included EGCG, Curcumin, and Vitamins D3+K2 in the Dr Lewis Nutrition® Product Line

I make Daily Brain Care as my flagship product because it embodies the central finding of my research career, that concentrated bioactive polysaccharides can support the brain, and I surround it with focused, high-quality supplements such as my EGCG, Curcumin, and Vitamins D3+K2 products. Every product I make reflects the same commitment to science, bioavailability, and honesty that defines Daily Brain Care.