Don’t Trust.
Verify Every Batch.
Third-party tested. Results published publicly. Every batch STAK™ dispatches includes a unique batch ID linked directly to its original Certificate of Analysis.
100%
Batch COA Coverage
≥99.0%
Avg HPLC Purity
Janoshik
Independent Testing
Same-Day
Mon–Fri Dispatch
Latest Tested Batch
STAK-RE10-0823
Retatrutide 10mg (Research Lyophilized Powder)
Janoshik Analytical
§02 · Verification Protocol
How We Verify Every Batch
A four-stage protocol. No batch reaches the catalogue until every stage is independently verified and published.
Intake & Quarantine
Every incoming lot is quarantined immediately, barcoded with a unique batch number, and sealed prior to independent sampling.
Independent HPLC & MS
Random samples are sent directly to independent third-party laboratories (Janoshik) for HPLC purity and Mass Spec sequence verification.
Public COA Published
The unedited Certificate of Analysis is uploaded directly to our public database, indexed permanently under its lot identifier.
Traceable Dispatch
Only batches exceeding 99.0% purity enter inventory. Your dispatch confirmation lists the exact batch ID inside your parcel.
Have a Batch ID to Audit?
Enter the batch number printed on your vial or order confirmation email to retrieve its full Certificate of Analysis.
§03 · Standards Comparison
STAK™ vs Typical Suppliers
What to look for when evaluating research-grade peptides — and where traditional suppliers fall short.
| Verification Criteria | STAK™ Standard | Typical Domestic Resellers | Overseas Resellers |
|---|---|---|---|
| 01COA for every individual batch | Per-batch, never per-compound | Single COA reused for years | No lot tracking / generic image |
| 02Independent third-party HPLC | External lab (Janoshik / Mass Spec) | In-house or unverified supplier paper | Unverified manufacturer slip |
| 03Batch number disclosed per order | Printed on vial & order confirmation | Rarely disclosed | Not offered |
| 04Public, searchable lab archive | Public COA lookup page | Email request required | Not available |
| 05Fast express dispatch | Same-day Mon–Fri cut-off | 2–5 business days dispatch | 2–4 weeks international shipping |
| 06Store credit / reship guarantee | Guaranteed on verified lost/damaged parcels | Conditional support | Customs risk / zero guarantee |
§04 · Research Questions
Testing & Verification FAQ
Detailed answers on testing methodology, COA lookup, and analytical standards.
What does independent third-party testing mean?
Every single lot STAK™ receives is sampled and sent to an independent third-party analytical laboratory (such as Janoshik Analytical). They perform High-Performance Liquid Chromatography (HPLC) purity testing and Mass Spectrometry (MS) identity verification, issuing an unmodified Certificate of Analysis directly. We publish the exact lab report against the batch identifier.
How do I verify the COA for the batch I received?
Your order confirmation email, dispatch label, and account portal list the unique batch number allocated to your order. Enter that batch number on our public Lab Results page to view and download the original third-party Certificate of Analysis.
What purity threshold do you enforce?
STAK™ targets ≥99.0% HPLC purity for research peptides. Every published COA shows the exact measured purity percentage for that specific lot — never a generic template figure. Any incoming lot falling below the documented specification is rejected at intake.
Why is this positioned strictly for research use only?
All compounds supplied by STAK™ are intended strictly for in-vitro laboratory research, analytical reference, and scientific testing. They are not medicines, therapeutic goods, or dietary supplements, and are not for human or animal consumption.
How are products handled and stored prior to dispatch?
Lyophilized peptides are held in climate-controlled temperature storage protected from light to preserve molecular stability. Orders ship in protective, tamper-evident packaging.
What happens if a parcel is lost or damaged in transit?
If your parcel is verified lost in transit by the carrier or arrives damaged, we issue store credit or immediate reshipment once verified. Simply contact our support team with your order number.
Verify Before You Order. Every. Single. Batch.
Every COA is public. Every order ships with a unique batch number you can audit. No guessing. No generic certificates.