Can You Trust Your Herbal Supplements?

It’s A Jungle Out There

Author: Dr. Stephen Chaney

JungleIn 2020 the annual retail sales of herbal supplements in the United States exceeded $12 billion, and the sales of herbal supplements continues to grow at almost 10% per year.

Each of those herbal supplements are marketed to help with a particular health issue. The promise is that they are “natural”. They don’t have the side effects associated with most medications.

But what if it were all a hoax? What if the supplement was adulterated – it contained an inactive powder rather than the active herbal ingredient claimed on the label?

Would you be outraged? You should be.

Unfortunately, it is a jungle out there! Popular botanical ingredients are expensive. It is a lot cheaper to substitute cheaper inactive ingredients for the botanical ingredients listed on the label. This is a shady practice called intentional adulteration.

And equally unfortunately, many manufacturers don’t perform the kind of quality controls that would allow them to identify adulterated herbal ingredients before they end up in their products.

So, you might be wondering:

  1. “Are the herbal supplements I am using adulterated? Am I wasting my money?”
  1. “How can I protect myself from this unethical practice?” “How can I become an informed consumer?”

The study (N Orhan et al, Natural Product Reports, DOI: 10.1039/d4np00014e, March 27, 2024) I am reviewing today answers the first question. It estimates the prevalence of adulteration in the top 5 most popular herbal supplements in the United States; black cohosh, echinacea, elderberry, ginkgo, and turmeric.

I answer the second question below.

What Is Adulteration And How Does It Occur?

questionsTo understand how adulteration occurs it’s best to start from the beginning.

How Do Herbal Ingredients Get Into The Product You Buy?

  • It starts with individual farmers who sell raw ingredients to a supplier.
  • The supplier combines the raw ingredients from multiple farmers into bulk botanical ingredients which they sell to a manufacturer.
  • The manufacturer combines ingredients from several suppliers and creates the herbal supplements you buy.

How Is Adulteration Defined? Adulteration can be accidental, but it is most often intentional. The authors of this paper defined intentional adulteration as “the fraudulent addition of non-authentic substances or the removal and replacement of authentic substances without the purchaser’s knowledge [usually] for the economic gain of the seller.”

How Does Adulteration Occur? Two things are required for the adulteration of herbal supplements – adulteration by the seller and either lack of quality controls or quality controls that are unable to detect the adulteration by the buyer. For example:

  • A farmer sells adulterated raw ingredients to the supplier, and the supplier does not employ adequate quality controls to detect the adulteration.
  • A supplier sells adulterated bulk botanical ingredients to a manufacturer, and the manufacturer does not employ adequate quality controls to detect the adulteration.
  • Of course, when it comes to adulteration of ingredients by the manufacturer, you are the buyer. You have no way to do quality controls on the herbal supplements you buy. But you can become an informed consumer. I tell you how below.

How Was The Study Done?

clinical studyThe investigators focused on five of the top-selling herbal ingredients in the United States for which there were a substantial number of published studies on adulteration. The five herbal ingredients they chose were black cohosh, echinacea, elderberry, ginkgo, and turmeric.

They then searched public databases for all papers on adulteration of these ingredients between January 2000 and July 2023. They identified 78 publications with 2,995 samples of herbal ingredients analyzed.

The samples analyzed included raw ingredients sold by farmers, bulk botanical ingredients sold by suppliers, and herbal supplements sold online or at retail outlets.

The extent of adulteration of each of the five herbal ingredients was calculated as the total number of adulterated samples in relation to the total number of samples analyzed. Overall, 818 of the 2,995 samples analyzed (27%) were adulterated.

Can You Trust Your Herbal Supplements?

AvoidThe results of this study were astonishing and depressing. The extent of adulteration was:

  • 56.7% for ginkgo.
  • 42.2% for black cohosh.
  • 28.5% for echinacea.
  • 17.1% for elderberry.
  • 16.5% for turmeric.

And this is just the tip of the iceberg.

  • The Botanical Adulterants Prevention Program has identified almost 30 botanicals (herbal ingredients) that are subject to adulteration. And this program is just getting started. Many more herbal ingredients remain to be tested for adulteration.
  • This study just reported on adulteration of herbal ingredients. It did not assess contaminants such as pesticides, herbicides, fungicides, and heavy metals. Any manufacturer with quality controls unable to detect adulteration would likely miss many of these contaminants as well.

 

The authors concluded,

  • “The data show that a substantial portion of botanical dietary supplements do not contain what is on their labels.”
  • “Quality control methods used by suppliers, manufacturers, researchers, and regulators need to be sufficiently specific to detect possible adulterants in botanical ingredients and produce high-quality authentic products.”
  • “There are numerous examples where analytical methods used in industry quality control…have been shown to be inadequate to detect adulteration and properly authenticate botanical materials.”

How To Become An Informed Consumer

SkepticThis study just confirms what many of you have already suspected. For many herbal supplements on the market, you can’t trust that what’s on the label is in the product. You can’t trust the products will deliver on their claims. It’s all “smoke and mirrors”.

So, how can the consumer protect themselves from herbal supplements that are worthless – supplements that are just a waste of money? I have two recommendations for you.

#1: Become a skeptic. Don’t believe what sales representatives tell you, ads show you, and websites tell you about the quality of a company’s herbal supplements. Over the years I have seen many company websites that raved about their quality controls and claimed their products were as pure as “the driven snow” – until the day the FDA shut them down because none of that was true.

#2: Become an investigator. If you are thinking about using a company’s herbal supplements, ask:

  • How many quality controls they do on the botanical ingredients used in their products and whether those quality controls can detect both contaminants and adulterants. The answers to those two questions should be, “hundreds” and “yes”.
  • How many quality controls do they do on their final product before they release it to the public. The answer should be “dozens” to “hundreds” depending on how many ingredients they have in the product. And don’t be fooled because they tell you their products are “third party tested”. Ask the same questions about the third party that is testing them.
  • How many clinical studies have they published in peer-reviewed scientific journals showing their products are safe and effective. The answer should be “hundreds”.

If you can’t find answers to these specific questions on the company’s website or through direct inquiry, move on. Find another company that can give the correct answers to these questions.

No matter how impressive the claims sound, a company’s product is only as good as the testing and proof behind it.

The Bottom Line

A recent study looked at adulteration (the substitution of worthless ingredients for the active ingredient) of the top 5 botanical ingredients used in herbal supplements in the United States.

The results of this study were depressing. The extent of adulteration was:

  • 56.7% for ginkgo.
  • 42.2% for black cohosh.
  • 28.5% for echinacea.
  • 17.1% for elderberry.
  • 16.5% for turmeric.

And this is just the tip of the iceberg.

The authors concluded,

  • “The data show that a substantial portion of botanical dietary supplements do not contain what is on their labels.”
  • “Quality control methods used by suppliers, manufacturers, researchers, and regulators need to be sufficiently specific to detect possible adulterants in botanical ingredients and produce high-quality authentic products.”
  • “There are numerous examples where analytical methods used in industry quality control…have been shown to be inadequate to detect adulteration and properly authenticate botanical materials.”

For more details about this study and how you can protect yourself from worthless supplements by becoming an informed consumer, read the article above.

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.

_______________________________________________________________________________

My posts and “Health Tips From the Professor” articles carefully avoid claims about any brand of supplement or manufacturer of supplements. However, I am often asked by representatives of supplement companies if they can share them with their customers.

My answer is, “Yes, as long as you share only the article without any additions or alterations. In particular, you should avoid adding any mention of your company or your company’s products. If you were to do that, you could be making what the FTC and FDA consider a “misleading health claim” that could result in legal action against you and the company you represent.

For more detail about FTC regulations for health claims, see this link.

https://www.ftc.gov/business-guidance/resources/health-products-compliance-guidance

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About The Author 

Dr. Chaney has a BS in Chemistry from Duke University and a PhD in Biochemistry from UCLA. He is Professor Emeritus from the University of North Carolina where he taught biochemistry and nutrition to medical and dental students for 40 years.  Dr. Chaney won numerous teaching awards at UNC, including the Academy of Educators “Excellence in Teaching Lifetime Achievement Award”. Dr Chaney also ran an active cancer research program at UNC and published over 100 scientific articles and reviews in peer-reviewed scientific journals. In addition, he authored two chapters on nutrition in one of the leading biochemistry text books for medical students.

Since retiring from the University of North Carolina, he has been writing a weekly health blog called “Health Tips From the Professor”. He has also written two best-selling books, “Slaying the Food Myths” and “Slaying the Supplement Myths”. And most recently he has created an online lifestyle change course, “Create Your Personal Health Zone”. For more information visit https://chaneyhealth.com.

For the past 45 years Dr. Chaney and his wife Suzanne have been helping people improve their health holistically through a combination of good diet, exercise, weight control and appropriate supplementation.

It’s Buyer Beware In The Food And Supplement Industries

How Can You Identify High Quality Products?

When it comes to the food and supplement industries a paraphrase of the famous introduction to “A Tale Of Two Cities” comes to mind; “It is the best of worlds, it is the worst of worlds.”

There are companies who value your health more than their bottom line. They insist on the highest quality ingredients, verify the purity of their ingredients, and run extensive quality controls on their final product. It’s an expensive process, but you are worth it.

I wish I could tell you that all companies cared enough about your health to produce products that are pure and potent. Unfortunately, I cannot.

Some products don’t contain the amount of active ingredient claimed on the label. Some products contain potentially toxic contaminants. These errors are usually due to poor manufacturing processes and/or lack of proper quality controls.

Even worse, some products are adulterated. That means the manufacturer substituted a cheaper ingredient for the active ingredient. That cannot be accidental. Adulteration is a willful act to deceive the consumer.

I also wish I could tell you the USDA and the FDA are protecting you by making sure food and supplement products are pure and potent. Unfortunately, I cannot.

It’s not that they aren’t trying. They are simply overwhelmed.

  • There are hundreds of charlatans in the marketplace.
  • It often takes 2 to 5 years of litigation to put bad actors out of business.
  • And, as soon as they put one out of business, another one pops up. It’s like that “Whack A Mole” game at the county fair.

Normally, I see reports of poor quality products every few months. But when five product horror stories crossed my desk in a few weeks, it is time to speak up. This week I will share reports on quality control and adulteration issues with:

  • Turmeric supplements.
  • Lavender essential oils.
  • Bitter orange supplements.
  • Avocado oil.
  • CBD products.

Adulteration Of Turmeric Supplements

Turmeric supplements are “hot” right now. Their sales have almost doubled in the last couple of years. Whenever a product becomes this popular, unscrupulous manufacturers are tempted to jump into the market. Looking to make a quick buck they substitute inactive, less expensive ingredients for the active ingredients – a process called “adulteration”.

To better understand how turmeric supplements are adulterated, let’s look at how turmeric supplements are made. The active ingredients in turmeric supplements are a class of compounds called curcuminoids that come from the root of the Curcuma longa plant.

1) The simplest way to create a turmeric supplement is to simply grind the root into a powder and put the resulting turmeric powder into a capsule or tablet.

    • However, turmeric powder is often adulterated by substituting the less expensive Curcuma zeodoria root (from wild turmeric) for the Curcuma longa

2) The more potent turmeric supplements extract the active curcuminoids from turmeric powder.

    • However, turmeric extracts are often adulterated by substituting synthetic curcumin for the natural extract.

Fortunately, the American Botanical Council has created a program called Botanical Adulterants Prevention Program (BAPP) to identify bad players in the botanicals (meaning anything coming from plants) market. In a recent bulletin on turmeric adulteration, they reported:

  • In one test of turmeric powder, all the samples tested had more Curcuma zeodoria powder than Curcuma longa
  • In another test of turmeric powder, 4 out of 6 samples were adulterated with Curcuma zeodoria
  • In a test of turmeric extracts, 4 out of 5 samples were adulterated with synthetic curcumin.

Is Curcuma zeodoria powder as safe and effective as Curcuma longa powder? Nobody knows.

  • Curcuma zeodoria root has a different mix of curcuminoids than Curcuma longa root, and some concerns have been raised about the safety of Curcuma zeodoria

Is synthetic curcumin as safe and effective as natural turmeric extract? Nobody knows.

  • The FDA views synthetic versions of natural botanical compounds as different from the botanical itself, Thus, if a supplier correctly identified their extract as containing synthetic curcumin, they would be required to file an NDI notification with FDA, including proof of safety, for products containing their extract to be legally sold in the US.
  • The use of synthetic curcumin may replace the other curcuminoids found in natural turmeric extracts. In other words, you would not be getting the full spectrum of curcuminoids you would find in a natural extract standardized to 95% curcuminoids.

Note: The American Botanical Council Bulletin did not address turmeric products that are available on the marketplace. They reported on the major suppliers of the raw materials that manufacturers purchase to make their turmeric products. This has two important implications for consumers like you and me:

  • Many companies base their label claims on the specifications provided by the supplier of their raw ingredients. However, unless they run independent quality control tests on the raw ingredients, they actually have no idea what is in their product.
  • That means when comparing turmeric products, we should not rely on label claims or price alone. We should ask about the company’s quality control process, particularly whether they run independent quality control tests on the ingredients they use.

Adulteration Of Lavender Essential Oil

Lavender oil has been around for hundreds of years. It has long been prized for its calming effect. It has traditionally been used in aromatherapy for relief of stress, anxiety, depression, and to improve sleep.

With the recent “essential oil” craze, it has been reclassified as an essential oil with an impressive list of additional “benefits” – such as relieving headaches, getting rid of acne and eczema, reducing menstrual cramps, and reducing inflammation to name a few.

As you might expect, the market for lavender essential oil is exploding. It is expected to almost double between 2016 and 2024.

However, lavender oil is hard to come by. The lavender flowers are steamed to release the volatile components, and the oil is then distilled. Only a tiny fraction of the lavender plant ends up in the final product. You might suspect that manufacturers would be tempted to cut corners. You would be correct.

Once again, the American Botanical Council’s Botanical Adulterants Prevention Program (BAPP) comes to the rescue. Recently BAPP tested lavender essential oils in the marketplace. Their newly-released bulletin reported that 82% of lavender products on the market were adulterated.

  • Some of the adulterated products used oils from related plant species.
  • Some products used oils from unrelated plant species like rosemary.
  • Other products used synthetic oils.

All the adulterated products used oils that were less expensive than genuine lavender oil. To the untrained consumer the adulterated products may smell like lavender oil, but there is no evidence that the oils substituted for lavender oil have the same benefits as lavender oil.

This is not simply a quality control issue. It was not accidental. You don’t start with plant species other than lavender and expect to end up with lavender oil. And you really don’t start with synthetic oils and expect to end up with natural lavender oil. This is deception, pure and simple.

Poor Quality Control Of Bitter Orange Supplements

Bitter orange is another name for the Seville Oranges you may have seen in your local market. Unripe Seville Oranges are quite bitter, and this is the form used in supplements.

Traditionally, bitter oranges have been used as a digestive aide. More recently, some unscrupulous manufacturers have advertised bitter orange as a fat burning supplement and have marketed it as a sports nutrition and weight management supplement.

Any supplement marketed as “fat burning” attracts a lot of attention. Once again, sales have skyrocketed, and manufacturers have been tempted to cut corners. This attracted the attention of the USDA, who recently published a study assessing the quality of supplements containing bitter orange.

The USDA purchased 59 products available in the US that either contained bitter orange as the primary ingredient or as one of the major ingredients in a proprietary formula. They tested these products using state-of-the-art analytical techniques. What they found wasn’t pretty.

  • Only 5 of the products had the amount of active ingredient claimed on the label. This could be a quality control issue, but it is not reassuring to you, the consumer.
  • Some of the products had higher amounts of minor compounds found in the bitter orange than they did of the active ingredient. It is hard to imagine how this occurred unless those manufacturers used what was left over after other companies had extracted the active ingredient. And there is no research on the effects of these minor compounds in humans.
  • 7 of the products had synthetic ingredients that had never seen a bitter orange. Once again, there is no evidence these compounds are either safe or effective.

Poor Quality & Adulterated Avocado Oil

Avocado

Avocados are in. They are prized as a source of antioxidants and healthy monounsaturated fats. Avocado oil has all the benefits of raw avocados, plus it has an extremely high smoke point, making it ideal for high temperature cooking.

It’s no wonder that sales of avocado oil have soared by 52% in the last couple of years alone. Once again, there will be manufacturers who are tempted to cut corners.

Fortunately, scientist at University of California, Davis recently published a study on the quality of avocado oil. Unfortunately, they found that most of the avocado oil sold in the US was oxidized, mislabeled, or misbranded.

The scientists purchased 14 brands of avocado oil from local markets and purchased an additional 8 brands online. Here is what they found:

  • 82% of the 22 brands they tested were either oxidized or mixed with other oils. Specifically:
    • 15 of the brands were oxidized, which compromises both the taste and the health benefits of avocado oil.
    • 6 of the brands were adulterated with cheaper oils, including sunflower, safflower, and soybean oil.
    • 3 of the brands contained little or no avocado oil. They were mixtures of other oils. This is even worse than simple adulteration. These products should not have even been labeled as avocado oil.
      • Interestingly, 2 of the 3 brands with no avocado oil were labeled “extra virgin” avocado oil, which is supposed to indicate the highest quality oil. Did I mention “buyer beware”?

CBD Horror Stories

I don’t need to tell you that the CBD industry has taken off in recent years. Most of the claims for CBD products are unproven, but that is another story for another time.

Even more worrisome are quality control issues for CBD products. In fact, it is so worrisome that congress asked the FDA to study quality controls in the CBD industry and report back to them, which they did last month.

Let me start with a little history. Congress has asked the FDA to set safety, efficacy (product claims), and quality standards for CBD products.

1) The FDA is farthest along with product claims. They have rejected most product claims for CBD products and have initiated legal actions against several companies that have refused to stop making these product claims.

2) With respect to safety they have specified that CBD products should contain less than 0.3% THC (marihuana) but have not yet completed safety studies on other CBD ingredients.

3) With respect to quality controls, they have started by surveying the quality of CBD products currently available in the US. They tested 147 products, and the results weren’t pretty. As described in their report to congress:

    • 9 CBD products contained no CBD.
    • 18 products were less potent than advertised. They contained less than 80% of the amount claimed on the label.
    • 38 products were more potent than advertised. They contained more than 120% of the amount claimed on the label.
    • 72 products (49% of the total) contained impermissible levels of THC.

How Can You Identify High Quality Products?

As I said in my book “Slaying The Supplement Myths” there are ethical supplement companies that care about your wellbeing and produce high quality products. However, there is also a dark underbelly of the food and supplement industries.

In the article above I have shared examples of products that:

  • Contained little or no active ingredient.
  • Contain less or more of the active ingredient than claimed on the label.
  • Contain potentially harmful contaminants.
  • Are adulterated by substituting cheaper ingredients which may not be effective for the active ingredient.

At this point you are probably asking, “How do I protect myself? How do I make sure that I am not wasting my money and jeopardizing my health when I buy a supplement? I cover the answer to this question in my book, “Slaying The Supplement Myths“. Here is a shortened version:

  • Ignore the slick marketing.
  • Don’t base your decision on price alone. That can be a trap.
  • Do your research. Ask questions. Only choose reputable companies that do quality
    controls on both the raw ingredients and the finished product.

The problem, of course, is that every company claims to run stringent quality control tests. My
suggestion is to ask them about their quality control process. Here are the questions to ask (you will find more in my book):

1) Do you run tests to confirm the purity of your raw ingredients, or do you accept the claims of your suppliers?

2) How many quality control tests do you run on your final product? If it is a single nutrient product, the number should be in the dozens. If it is a multivitamin, the number should be in the hundreds. For more complex products, you should expect a thousand or more quality control tests.

3) Do you run quality controls on every batch…or, put another way…How many quality controls do you run each year? Those should run into the tens of thousands.

4) What kind of analytic methods do you use?

These are tough questions, but they are the right questions to ask before you pick a supplement company. After all, you are entrusting your health to their products.

The Bottom Line

There are ethical food and supplement companies that care about your wellbeing and produce high quality products. However, there is also a dark underbelly of both the food and supplement industries.

In the article above I have shared examples of products that:

  • Contained little or no active ingredient.
  • Contain less or more of the active ingredient than claimed on the label.
  • Contain potentially harmful contaminants.
  • Are adulterated by substituting cheaper, less effective ingredients for the active ingredient.

I shared reports of quality control and adulteration horror stories with:

  • Turmeric supplements.
  • Lavender essential oils.
  • Bitter orange supplements.
  • Avocado oil.
  • CBD products.

I also shared how to find companies that make high quality products you can trust.

For more details, read the article above.

To find which supplements I recommend, click here.

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.

 

Health Tips From The Professor