Supplier evaluation guide

"USA-made" isn't one thing. Here's what to actually check

A quick reference for evaluating research compound suppliers.

The core problem

There's no enforced definition of "USA-made" in this industry. It can mean:

Built from raw amino acids in a US facility: full synthesis, start to finish
Synthesized overseas, only finished here: filled, packaged, labeled domestically

Both get the same label. Only one tells you where the compound actually came from.

The one question that matters most

Where is the API (active pharmaceutical ingredient) actually synthesized?

Not where the company is headquartered. Not where testing happens. Where the compound is built.

Why this matters

	Full US synthesis	Overseas synthesis, US finish
Traceability	One facility, fully documented	Paper trail runs through a factory that reports its own results
Supply risk	Domestic supply chain	Exposed to export controls, customs holds, shipping delays
Quality control	Verifiable end-to-end	Depends on trusting an unverified overseas process

Same label. Different product.

The reality of the industry

The US accounts for a minority of FDA-registered API manufacturing sites worldwide. Most production is concentrated in China and India. That's why the majority of "US" suppliers import raw API and handle only the last step domestically.

This isn't hypothetical. Between December 2025 and March 2026, U.S. Customs and Border Protection officers at the Port of Cincinnati identified over 300 master-carton smuggling attempts concealing roughly 5,000 individual mislabeled compound shipments, including GLP-1 actives such as retatrutide, semaglutide, and tirzepatide. Source: U.S. Customs and Border Protection.

Purity testing isn't the whole answer either

A 99%+ HPLC purity result is useful, but it's one data point. It shows what that specific test can detect, not everything that could be present. Synthesis quality and testing rigor both matter. One doesn't substitute for the other.

5 questions to ask any supplier

Ask any supplier these questions. If they can't answer plainly, walk away.

Where is the compound synthesized? Not filled, not tested, but built from raw amino acids.

Is the synthesis facility ISO 9001:2015 certified and FDA registered?

Is sterile filling done in an ISO Class 5 cleanroom?

Which independent third-party lab tested this specific batch? Ask to see a COA tied to the lot number on the vial.

What is the purity threshold? Ask whether they publish HPLC and mass spec results.