Warning Letter Wednesday Logo

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.


Subscribe to Warning Letter Wednesday®

We'll never share your email with anyone else. Cancel at any time.

Current Post September 16, 2026
Warning Letter Wednesday Logo

Dietary Supplement GMP Sanitation Citations

Properly written SOPs are essential for compliance

I’ve seen a lot of dietary supplement manufacturing facilities in my life, and within a few minutes you can usually determine how seriously a company takes GMPs. In this warning letter, a supplement manufacturer received several GMP-related 483 violations. Today, I’ll focus on sanitation issues. ...

Recent Warning Letter Wednesday Posts

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.

Upcoming Events

See Asa in person