August 19, 2026 By: Asa Waldstein

Exploring “#1 Best Selling” Statements

Takeaway -

Review all marketing in context

“#1 Best Selling Brand” is a bold statement to make. In this case, the National Advertising Division (NAD) helps clarify what this means and how to substantiate it.

One of the challenged claims was “#1 Best Selling Beets Brand in America.” The challenger asserted “that dollar sales—not unit sales—are the appropriate measure of marketplace leadership and that its brand leads on that basis.” NAD had a different opinion. The key point is that following precedent, especially when statements significantly impact purchasing behavior, is a good idea.

From NAD decision summary. “Consistent with its precedent, NAD determined that unit sales are generally the appropriate metric for substantiating such claims. NAD found that the record did not demonstrate that differences in product form, size, or pricing made unit sales an unreliable measure in this case.”

However, NAD recommended that the broader “#1 Beets Brand in America” claim be qualified to disclose that the ranking was based on total unit sales. This distinction is interesting.

“#1 Best Selling Beets Brand in America” has substantiation precedent with unit sales numbers, whereas “#1 Beets Brand in America,” without qualification, could potentially mean something slightly different. The nuances play an important role in compliance. When in doubt, check how a reasonable consumer (i.e., net impression) views the advertising.

From NAD decision summary. “NAD noted that “#1” claims are highly influential and typically communicate that a product is purchased more often than competitors. NAD concluded that … had a reasonable basis for the claims “America’s #1 Best-Selling Beets Brand,” the “#1 Best Selling Beets Brand in America,” and the “#1 Beets Brand in America” with current data on total unit sales. 

NAD case summary.

Disclaimer: The educational information provided here is for informational purposes only. Contact an attorney for specific legal advice. Rule #1 in compliance is to ensure marketing is truthful and not misleading.

Written by

Asa Waldstein
Asa Waldstein
Asa Waldstein is a 24-year veteran of the dietary supplement industry, with experience spanning manufacturing, marketing, and regulatory compliance. He is the principal of Apex Compliance, a software company dedicated to streamlining regulatory marketing compliance for the dietary supplement and natural products sectors. Asa also leads Supplement Advisory Group, a boutique consultancy focused on marketing risk analysis, labeling, and practical compliance strategies for websites and social media. Asa has helped oversee three FDA GMP inspections with no 483s and was honored with the 2023 AHPA Herbal Hero Award and the 2024 What's Up Supps Policy and Change Agent Award. He currently serves as Chair of the American Herbal Products Association’s (AHPA) Technology & AI Innovation Committee.