TWO REPORTS · DIFFERENT QUESTIONS
ZC Labs and Amino Club: what do the reports actually establish?
Identity, contamination and microbial evidence matter more than a purity headline alone. Start with the method—not a supplier ranking.
Not a head-to-head product comparison. These are different compounds, lots, laboratories and report dates. Their purity percentages and coverage scores cannot establish which company or product is better.
Affiliate disclosure: Compound IQ has affiliate relationships with both companies and may earn commission from qualifying purchases through links in the full reviews. Inclusion reflects those relationships, not a safety endorsement. Full disclosure.
Published October 15, 2026. This summary uses the documents described in our linked reviews; it is not a new laboratory test or fresh inventory verification.
ZC Labs
ZC-RT 15 mg
Lot ZC-RT15-101 · report June 9, 2026
Is identity documented?
LC-MS identity result documented.
What does the purity result say?
99.89% by HPLC-UV; measured content 16.28 mg.
Microbes and endotoxin
Sterility and endotoxin results are not reported in the reviewed record.
Contaminants
Heavy metals and residual solvents are not reported in the reviewed record.
Limits you should not skip
Four of seven evidence categories are documented. Missing results are not failed tests. This record does not establish that current inventory matches this tested lot.
Open original source: Freedom Diagnostics · accession 2606080081Read full ZC Labs evidence review →Amino Club
GHK-Cu 50 mg
Lot GHK0003 · report July 30, 2026
Is identity documented?
Retention-time reference match documented; this is not mass-spectrometry identification.
What does the purity result say?
99.81% by RP-HPLC at 214 nm; measured content 53.63 mg.
Microbes and endotoxin
PCR-based rapid microbial screen: No Growth. This is not conventional USP <71> sterility testing. Endotoxin reported ≤0.05 EU/mL under USP <85>.
Contaminants
Five metals and fentanyl reported Not Detected. Interpret each tested analyte with the report's method and detection limits; this does not mean all contaminants are absent.
Limits you should not skip
Seven of seven evidence categories are documented, with important method limits. Category coverage is not proof of sterility, safety or suitability for use, and does not establish a match to current inventory.
Open original source: ILS Laboratories · COA-2026-O1K75PRead full Amino Club evidence review →THE USEFUL NEXT STEP
Match the lot. Check the method. Read the limits.
A published COA describes the submitted sample under the reported tests. It does not independently prove what is in another vial. Ask for a matching lot record and distinguish identity, purity, microbial and contaminant tests. Use the verification guide or read our evidence framework. Research education only—not medical advice or a product-use recommendation.
