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Welcome to Warning Letter Wednesday®

A weekly exploration of FDA warning letters and enforcement trends

Every Wednesday Asa reviews interesting warning letters and other enforcement trends. He’s been writing this each week for 5 years, and it is a labor of regulatory love.


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Current Post November 11, 2026
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GMP Basics & Black Walnut Hull Allergen Labeling

GMPs and 483 responses are important

This week’s WLW brings us back to GMP basics and a black walnut hull labeling question. Let’s see what we can learn. FDA inspected this herbal supplement company from May 12 through June 8 of this year, which is a lengthy inspection period. At the ...

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Asa Waldstien the author of Warning letter Wednesday

Who is 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.

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