Webinar Recording: Whitepaper on DNA barcode testing reveals how misapplication of science led to ba

The Capabilities and Limitations of DNA Barcode Testing

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Published: Wednesday, March 11, 2015

A comprehensive analysis of DNA barcode testing on botanical dietary supplements has called conclusions reached by the New York Attorney General’s (NY AG) office in an investigation of four major retailers of botanical supplements, a “…misuse of the technologies” that led to a “…misinterpretation of test results.” In the white paper, the four expert authors identified five potential weaknesses of the month-old investigation, which generated extensive publicity and unwarranted damages to the dietary supplement industry, including materially undermining consumer confidence in products that can benefit their health.

According to lead author Danica T. Harbaugh Reynaud, Ph.D., CEO, AuthenTechnologies LLC, “As the Attorney General’s office has not released the full methodology, the testing procedures or the analytics of the tests, it is impossible to place any confidence in the publicized results. However, we can conclude that because of the limitations of DNA barcoding, especially on botanical extracts, that the claim by the NY AG’s office that the majority of supplements lacked any botanicals at all is, quite simply, unjustified.”

The white paper raises five critical questions, including the following two, which, unless answered completely by the NY AG, cast serious doubts about the conclusions reached by his office:

  • Were the DNA barcoding methods inappropriately used on botanical extracts? The fact is that most, if not all, of the material containing cells (with the DNA) is typically removed during extraction (or at the very least, damaged), leaving the phytochemicals but not the DNA in the finished product.
  • Did the laboratory performing the test have sufficient knowledge of the complexities of testing botanical dietary supplements? Specialized training and extensive experience in the field of plant-species identification on top of a solid understanding of the various processing and extraction techniques used by each manufacturer are necessary to obtain reliable results from testing botanical dietary supplements.

The remaining questions raised by the authors focused on: whether adequate procedures were used in the testing lab; if validated reference sequences and appropriate analytical tools were used to identify species; and if valid conclusions were reached from the results. The authors conclude that the NY AG’s refusal to release answers to these five questions, along with a detailed explanation of the DNA testing methods used, raise serious concerns about the validity of the results.

The white paper also provides a scientific primer on DNA barcoding, offering a definition of the method, how it works, its capabilities and limitations, and seven key areas that need to be addressed in order to perform accurate species identification using any DNA method. In addition to Dr. Harbaugh Reynaud, the co-authors were Brent D. Mishler, Ph.D., University of California, Berkeley; James Neal-Kababick, Flora Research Laboratories, LLC; and Paula N. Brown, Ph.D., British Columbia Institute of Technology.

The white paper was commissioned by four trade associations representing the dietary supplement industry: the American Herbal Products Association (AHPA), the Consumer Healthcare Products Association (CHPA), the Council for Responsible Nutrition (CRN), and the United Natural Products Alliance (UNPA).

View and download the white paper >>


The Botanical Safety Handbook, Second Edition includes:

  • Easily understood classification systems to indicate the safety of each listed species and the potential for drug interactions
  • Information on adverse events reported in clinical trials or case reports 
  • Safety-related pharmacology and pharmacokinetics of each herb
  • Additional information on the use of herbs by pregnant or lactating women 
  • Toxicological studies and data on toxic compounds 
  • Extensive references for each entry

The book is available in hardback print and online formats. Both versions contain the same information, but the online version, which is optimized for smartphones and tablets, has several additional attributes. Some of these relate to its operation, as it allows subscribers to search for keywords and botanical names and easily access the information they use most by saving personalized lists of entries. Perhaps more importantly, the online version will be updated regularly with new research, and subscribers will be notified of updates to provide immediate access to the most current information. The standard retail cost for either version is $119.95 (one-time cost in print; a renewable annual subscription online). We are discounting the cost for our members and would be happy to offer a discount to other organizations. A free preview of several entries are available online:

Subscribe to the online version or purchase a hardcover copy today. AHPA's Botanical Safety Handbook, Second Edition  Print Version: 1,042 pages, revised edition published in 2013 AHPA's Botanical Safety Handbook, Second Edition Online

Member annual subscription: $95.00 
Non-member annual subscription: $119.00 Discounts available for multiple user subscriptions.

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