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Access helpful guides, references, and documentation to better understand our testing services, methods, and regulatory standards.

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The Letter Is About Copies: What FDA Warning Letter 738238 Actually Says

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The Letter Is About Copies - Vanguard Laboratory analysis of FDA Warning Letter 738238
The Letter Is About Copies - Vanguard Laboratory analysis of FDA Warning Letter 738238

The Letter Is About Copies: What FDA Warning Letter 738238 Actually Says

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Black and teal Vanguard Laboratory editorial image showing a topical pump, serum droplet, cream swipe, and the title The Package Is Part of the Formula.

The Package Is Part of the Formula

A topical formula is only finished in its final package. See how packaging, storage, use, and compatibility shape a defensible evaluation.
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The Recall Started Before the Final Vial: What Endotoxin Testing Reveals About Injectable Quality

A September 2026 recall shows why injectable quality begins with the incoming ingredient, and why sterility and endotoxin testing answer different questions.
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A Depot Is More Than Its API

Why long-acting peptide quality takes more than one number: assay, particles, residual solvents, degradation, and release behavior answer different questions.
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Verified by Vanguard portal displayed as the public source for laboratory result verification

Proof in Public: Why a Live Laboratory Record Changes Verification

Verified by Vanguard gives brands, clinics, quality teams, and customers a direct path to search the issuing laboratory's public record instead of relying on forwarded screenshots.
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One Signal, Four Possible Causes: Why a Mass Result Is a Clue, Not a Verdict

A plain-English look at why one peptide mass signal can have multiple causes, and how chromatography plus high-resolution mass spectrometry separate a clue from a defensible identification.
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The Retatrutide Black Market Just Got Real: What the First Lab Data Actually Shows

Only one of eighteen black-market retatrutide vials matched its label. The first published chemical analysis explains why that number should surprise you, and what it would take to actually verify one of these vials.
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The Verification Trap: a laboratory CoA and verification website dissolving into data

The Verification Trap: When the COA Website Is Fake Too

A polished CoA, QR code, padlock, and verification page can still come from one unverified source. Learn how to authenticate a result at the issuing lab.
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What Our Client Says

Real feedback from the people and businesses who rely on our expertise and appreciate our commitment to dependable, high-quality service.

Peptide Vendor

Lorenzo Ortiz

“Vanguard has an incredibly easy process for shipping, emailing order form for peptide testing, and payment. Processing time was a little took longer than advertised, but Tori was incredibly helpful and responsive. I will be using them in the future! “

Dietary Supplement Brand

Taylor Woody - Kimera Chems

 “Vanguard is my go to for testing all of my companies products for Quality Control and compliance. They also answer all my questions regarding testing and they don’t mind explaining the processes the use to come up with their results. If you’re looking for Quality testing services, these are the guys to call.”

Home Inspector

Shamus Hamill

“We have recently started using Vanguard Laboratory for home water quality testing. They are a family owned business with that family feel. Tori is consistently welcoming and a pleasure to work with! Rob and Dustin as well! The results continue to come back in a timely fashion, are professional looking and easy to read. Using Vanguard has been a great transition and will continue to be our # 1 water quality testing lab. Visit Vanguard Laboratory, they’re badass!”

Dietary Supplement Brand

ALKAA

“Tori and the team are fantastic. We’ve used Vanguard for over 4 years to test various trace toxins for our business. Without them we wouldn’t be where we are today, and we will continue to rely on them for future testing needs. A huge shout out to the Vanguard Team! “

Dietary Supplement Brand

LIV PURE

“Very pleased with Vanguard Laboratory’s! Tori was extremely helpful with getting our results to us in a timely manner and helped us with the ordering process. Also, there very personable as ” Lab Director”, Dustin, personal called us to discuses our questions about one of our samples. Thank you again Vanguard “