ZyntroTest vs Gold Standard Analytics
ZyntroTest, operated by Zyntro LLC, advertises Agilent LC-MS with diode-array detection, $200 peptide purity certificates in 3–5 days and "500+ tests per month" from College Station, Texas. What the site shows is thinner: the ship-to address is a PMB mailbox, the public COA page says sample reports will be published "once a designated demo COA is approved", the hero image is an Unsplash stock photo, and the testimonials name companies that do not otherwise appear online. Gold Standard Analytics is a 5,000 sq ft laboratory at a published Houston street address with named instruments, a named lead scientist, video chain of custody and a public library of real certificates.
ZyntroTest (Zyntro LLC), College Station, Texas (PMB mailbox address). zyntrotest.com. Facts checked September 9, 2026.
What Zyntro does well
- Self-service order builder with per-sample test selection and secure checkout, which several larger labs still lack.
- A published flat price: $200 per peptide sample, with supplement screening at $175–$275.
- Agilent LC-MS with DAD is the right instrument class for peptide purity.
- Fast stated response times: quotes within 24 hours, general inquiries in 2–4 hours.
Side by side
| Gold Standard Analytics | ZyntroTest | |
|---|---|---|
| Location | Gold Standard AnalyticsHouston, Texas. 5,000 sq ft laboratory at a published street address; tours by appointment. Prepaid UPS label included. | ZyntroTest1511 Texas Ave S, PMB 208, College Station. A PMB is a private mailbox at a shipping store, not a laboratory address; no lab facility is shown or named. |
| Peptide identity, purity and content | Gold Standard AnalyticsGSA peptide base pricing includes LC-MS/MS identity and HPLC purity. Net peptide content is a separate $29 add-on at every peptide tier. Select the compound and tests in the current intake for a quote. | ZyntroTest$200 per sample for LC-MS purity with "molecular identity confirmation". Net content not listed. |
| Turnaround | Gold Standard Analytics5–7 business days guaranteed; 48–72 h expedited (+50%); 24–48 h priority (+100%). | ZyntroTest3–5 business days stated; no guarantee. |
| Endotoxin | Gold Standard AnalyticsUSP <85> kinetic chromogenic LAL, $199, method and instrument on the certificate. | ZyntroTestNot offered. |
| Sterility | Gold Standard AnalyticsUSP <71> 14-day membrane-filtration culture, in-house, $195. | ZyntroTestNot offered. |
| Heavy metals | Gold Standard AnalyticsUSP <232>/<233> by ICP-MS, $169. | ZyntroTestListed in meta keywords; not on the services page with a price. |
| Public results | Gold Standard AnalyticsEvery certificate public and searchable by accession, including failures and retractions; a client cannot remove one. | ZyntroTestCOA search by order number for clients only. The site states public sample reports "will be published here once a designated demo COA is approved". None were published at the time of check. |
| Chain of custody | Gold Standard AnalyticsEvery package opened on camera, container photographed, blind-coded; footage retained three years and shared with the client. | ZyntroTest"Chain of custody maintained throughout" is asserted; no camera, photo, blind-code or retention detail. |
| Ordering | Gold Standard AnalyticsSelf-service online intake with verified account, live quote, instant prepaid label. API, MCP, Telegram and WhatsApp. | ZyntroTestOnline order builder and checkout; the contact page separately says invoices are sent after a request and payment is due before analysis. |
| Payment | Gold Standard AnalyticsCard, Apple Pay, Google Pay, Klarna, bank, Mercury invoice with net terms, any cryptocurrency. | ZyntroTestBank transfer, check, major cards; net 30 for established accounts. |
| ISO/IEC 17025 | Gold Standard AnalyticsOperated to ISO/IEC 17025 expectations with GLP-style data integrity. Not accredited, and we say so. | ZyntroTest"ISO 17025 Accreditation in Progress." No accreditation body, application or scope named. |
| Evidence of a working lab | Gold Standard AnalyticsPhotographed Agilent 1290, 6490, 7850, Charles River Endosafe and Steritest benches; instrument ID on every certificate; named lead scientist; tours by appointment. | ZyntroTestNo instrument photographs, serial numbers or staff named. Homepage hero is an Unsplash stock image. Testimonials are attributed to "BioVenture Research", "NutriPure Supplements" and "Apex Biotechnology", none of which we could locate. |
| Guarantee | Gold Standard AnalyticsMiss the quoted turnaround, or an accredited lab contradicts us on a retest of the retained sample, and the panel fee is refunded. | ZyntroTestNone published. |
Sources: zyntrotest.com/sample-submission, checked Sep 2026; zyntrotest.com, checked Sep 2026; zyntrotest.com/services, checked Sep 2026; zyntrotest.com/contact, checked Sep 2026.
Published prices
| Test | Gold Standard Analytics | ZyntroTest |
|---|---|---|
| Peptide identity, purity and net content | Gold Standard AnalyticsView current pricing | ZyntroTest$200 |
| GLP-1 class panel | Gold Standard AnalyticsView current pricing | ZyntroTest$0 |
| Endotoxin, USP <85> | Gold Standard Analytics+$199 | ZyntroTest$0 |
| Sterility, USP <71> | Gold Standard Analytics+$195 | ZyntroTest$0 |
| Heavy metals, ICP-MS | Gold Standard Analytics+$169 | ZyntroTest$0 |
Zyntro’s $200 covers LC-MS purity and identity only; net peptide content is not listed. GSA peptide base pricing includes LC-MS/MS identity and HPLC purity. Net peptide content is a separate $29 add-on at every peptide tier. Select the compound and tests in the current intake for a quote. Zyntro offers no endotoxin, sterility or priced metals panel.
Questions about ZyntroTest and Gold Standard Analytics
Is ZyntroTest legit?
We cannot say it is not, but the public evidence is thin: the ship-to address is a private mailbox, no public certificates have been published, no instruments, staff or facility are shown, and the accreditation claim is "in progress" with no body named. Ask for a facility address and a real certificate before shipping. Gold Standard publishes all of those.
Is Gold Standard a ZyntroTest alternative?
GSA peptide base pricing includes LC-MS/MS identity and HPLC purity. Net peptide content is a separate $29 add-on at every peptide tier. Select the compound and tests in the current intake for a quote.
Where does ZyntroTest test samples?
The site gives 1511 Texas Ave S, PMB 208, College Station, a mailbox, and shows no laboratory. Gold Standard tests at 5151 Mitchelldale St A10 STE B, Houston, where clients can tour.
Can I see a ZyntroTest COA before ordering?
Not at the time of check; the COA page says public sample reports will appear once a demo COA is approved. Gold Standard’s library of real certificates, including failures, is open to anyone.
Does Zyntro test endotoxin or sterility?
No. Its menu is LC-MS purity, supplement adulterant screening and raw-material identity. Gold Standard runs USP <85> endotoxin and USP <71> sterility in-house.
Is ZyntroTest ISO 17025 accredited?
No. The site says accreditation is in progress and names no accrediting body. Gold Standard is not accredited either and states it plainly.
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Services: Peptides testing · SARMs testing · Kratom testing · Hemp testing · Supplements testing
Submit a sample
Prepaid domestic label, public certificate, chain-of-custody video. Standard turnaround 5–7 business days.