ZC Labs
39 third-party certificates are on file across 19 tracked compounds, issued by ILS Laboratories. The testing laboratory holds ISO/IEC 17025 accreditation. Certificates sit behind an age gate. Record last re-checked 1 October 2026.
Edited by Slava Melikov, Research Editor · reviewed 1 Oct 2026
Last verified · 39 certificate records · rubric v1.12.0 · zc-labs.com/
Source: PepIndex, an independent index of research-peptide vendors. No vendor can pay for a rank, every score is computed by a published formula, and every figure links to the document it was read from.
Featured in the Verifying a COA with the lab →
PepIndex score
88 / 100
4.4/ 5Extensively documentedData coverage
93%
Coverage is the share of scored fields we hold and corroborated for ZC Labs. A score built on a handful of unchecked claims and a score built on forty verified data points are not the same finding, so both numbers are always published together. How coverage is computed.
Is ZC Labs legit?
Yes, on the evidence PepIndex holds. We have read 39 certificate records for ZC Labs, all issued by Freedom Diagnostics Testing, and score it 88/100 on 93% data coverage — rank 2 of 58.
- Across those lots the mean assayed purity is 99.68%, and the weakest single lot came back at 99.06%.
- 8 of 39 lots assayed below the mass printed on the label.
- PepIndex records the laboratory on those certificates, Freedom Diagnostics Testing, as holding ISO/IEC 17025 accreditation.
- The laboratory named on ZC Labs's own profile does not match the laboratory on the certificates PepIndex has read, so the stated name is not relied on here.
- Its certificates are age gated, which limits independent checking.
- On the business side it publishes a named legal entity, a postal address and prices visible without an account.
What this does not tell you
- PepIndex has located no independent customer reviews for ZC Labs, so nothing here speaks to its service or fulfilment.
- Because its certificates are not openly readable, a buyer cannot verify a specific lot without the vendor's cooperation.
- A score measures what a vendor publishes about its testing and its business. It does not measure the contents of any vial a buyer actually receives, and PepIndex does not commission its own assays.
Certificate recordsLot-level results with labeled versus assayed mass39 lots9.1% mean deviationView all →Hide ↑
Discrepancy is computed as the absolute difference between labeled and assayed mass, divided by the labeled mass. A vendor-published certificate is a claim; only an independently commissioned assay is treated as corroboration.
Recorded data pointsEvery field with its source, capture date and whether we corroborated it9 verified8 claimed2 not recordedView all →Hide ↑
A tag of verified means we opened the cited source and confirmed the value; published means we recorded the vendor’s own published information, taken at face value. Both count in full; only a value with no checkable source earns nothing. Fields older than 30 days are marked stale.
Testing
- Testing laboratory
- ILS LaboratoriesVerifiedStale1 Oct 2026sourceThe laboratory on the vendor's current certificates. Its own certificate index marks the ILS report as CURRENT (COA-2026-954869, lot ZCSK10, Selank 10mg, 10 June 2026) and the lab-side verify URL printed on it resolves. Earlier lots in the same index were tested at Freedom Diagnostics, which is what the 39 certificate records on file still name.
- ISO/IEC 17025 accreditation
- YesVerifiedStale1 Oct 2026sourceILS Laboratories states on the certificate: “Accreditation Scope: ILS Laboratories maintains ISO/IEC 17025 accreditation for activities listed in its published PJLA scope,” and the certificate carries the ilac-MRA and PJLA marks. Recorded for the laboratory, not the vendor.
- Certificate granularity
- Per lotPublished13 Oct 2026editorial checkVendor states certificates are now issued per lot rather than per batch. Relayed by the operator on 2026-10-13; the site serves a proof-of-work interstitial to every automated request, so no machine-readable corroboration is possible. Recorded as claimed pending a human re-read.
- Certificate accessibility
- Age gatedVerifiedStale28 Aug 2026source
- Labeled vs. actual mg published
- YesVerified13 Oct 2026editorial checkAll 39 certificates on file publish both a labelled and an assayed mass, not purity alone — e.g. lot ZCLa2606080081, labelled 15 mg against 16.28 mg assayed, on a Freedom Diagnostics certificate the vendor links publicly. Corroborated against the records themselves.
- Historical certificates retained
- YesVerifiedStale1 Oct 2026editorial checkThe vendor publishes a per-product certificate index that marks one report CURRENT and keeps superseded lots published as ARCHIVE, stating: “Archive covers earlier lots and re-tests and stays published for anyone still holding those vials.” Confirmed by direct inspection of that index — three lots visible for one product across two laboratories. Recorded as an editorial check because the page is client-rendered and yields no document links or lot numbers to a crawler.
Business
- Website
- https://zc-labs.com/Verified29 Oct 2026sourceNew domain, checked 2026-10-29: resolves and serves 200. Replaces zclabs.shop, which is NXDOMAIN under a registrar client hold.
- Legal entity
- ZC Labs LLCPublishedStale28 Aug 2026source
- Country
- USVerifiedStale28 Sept 2026editorial checkRead from the postal address this vendor publishes (PO Box 284, Myrtle Beach, SC 29578). A published address is not proof of an operating location — several vendors in this index use a registered-agent suite — so this records where the vendor says it is, not where it necessarily ships from.
- Physical address
- PO Box 284, Myrtle Beach, SC 29578PublishedStale28 Aug 2026source
- Contact channels
- Email (support@zclabs.shop), Live chatPublished13 Oct 2026editorial checkVendor states an on-site live chat channel now runs alongside support email. Relayed by the operator on 2026-10-13; not tested for a reply, so recorded as published rather than reachable.
Commercial
- Pricing
- ungatedVerifiedStale18 Aug 2026sourcePrices are published openly and can be compared without registering. Evidence: “…w all in one premium dashboard. Share Your Link 0 Total Link Clicks 0 Referrals $0.00 Unpaid Commissions 0% Conversion Rate Your Partner Link Customize & share…”
- Payment methods
- Not recordedNot recorded
- Guarantee / reship policy
- Guaranteed reshipVerifiedStale1 Oct 2026editorial checkPublished on the vendor’s site as a “30-Day Money-Back Quality Guarantee” together with “5 Business Days or $50 Off” on dispatch. Stated unconditionally rather than assessed case by case, which is the distinction this signal draws.
Track record
- Independent reviews located
- Not recordedNot recorded
- Mean sentiment (0–5)
- Not recordedNot recorded
- Complaint pattern
- Not recordedNot recorded
Compounds carried
What ZC Labs charges for each compound, read from its own store: the vial it lists, the price per milligram that implies, and that figure against the median of the vendors this index prices. Below 100% is cheaper than the market. Code pepindex takes 10% off at checkout.
- 5-Amino-1MQ2 certs$0.59 /mg$29.50 for 50 mg30%Visit
- DSIP2 certs$2.00 /mg$20.00 for 10 mg30%Visit
- Epithalon1 cert$0.68 /mg$34.00 for 50 mg30%Visit
- GHK-Cu2 certs$0.14 /mg$14.50 for 100 mg30%Visit
- Tirzepatide2 certs$1.90 /mg$18.99 for 10 mg30%Visit
- Ipamorelin3 certs$2.00 /mg$20.00 for 10 mg33%Visit
- Wolverine$2.25 /mg$44.99 for 20 mg35%Visit
- BPC-1572 certs$2.00 /mg$20.00 for 10 mg36%Visit
- Melanotan I1 cert$1.60 /mg$16.00 for 10 mg39%Visit
- Glutathione2 certs$0.02 /mg$36.00 for 1500 mg40%Visit
- KPV2 certs$2.00 /mg$20.00 for 10 mg40%Visit
- Melanotan II1 cert$1.60 /mg$16.00 for 10 mg40%Visit
- Retatrutide5 certs$2.90 /mg$28.99 for 10 mg40%Visit
- Tesamorelin4 certs$3.55 /mg$35.50 for 10 mg44%Visit
- TB-5001 cert$2.75 /mg$27.50 for 10 mg46%Visit
- Selank1 cert$2.00 /mg$20.00 for 10 mg48%Visit
- NAD+3 certs$0.06 /mg$29.99 for 500 mg50%Visit
- Semax1 cert$2.00 /mg$20.00 for 10 mg50%Visit
- KLOW$0.69 /mg$55.00 for 80 mg53%Visit
- MOTS-c3 certs$3.00 /mg$29.99 for 10 mg55%Visit
- SS-311 cert$3.75 /mg$37.50 for 10 mg69%Visit
Score history
| First recorded | 91.3 · #32 Oct 2026 |
|---|---|
| Best rank | #25 Nov 2026 |
| Today | 88 · #2-3.3 since first recorded |
Strengths
- Publishes 44 certificates on its own site; 39 read and recorded here
- Testing laboratory named on certificates (ILS Laboratories)
- Testing laboratory holds ISO/IEC 17025 accreditation
- Operates under a named legal entity (ZC Labs LLC)
- Publishes a physical postal address
- Prices are visible without an account
Weaknesses
- Certificates are gated rather than openly readable
- No independent third-party reviews located
What the certificates test
Beyond purity and mass. Each row is an assay the laboratory ran and the verdict its own certificate printed. Coverage is recorded, not figures: these documents are tables, and the specification and the result are not reliably separable once the text is extracted.
- Identity (mass spectrometry)
- ReportedLC-MSon 39 of 39
- Purity (HPLC)
- ReportedHPLC-UVon 39 of 39
- Content / quantitation
- Reportedon 39 of 39
- Appearance
- Reportedon 39 of 39
Not reported on the certificates read: Bacterial endotoxins, Sterility, Elemental impurities / heavy metals, Residual solvents, Microbial / bioburden. A test a certificate does not mention is a test this index holds nothing on — it is not a failure and is not counted as one.
Read 5 Oct 2026 from the certificates themselves. How evidence is recorded.
Third-party reviews
Shown for reference and kept out of the score. Review platforms can be gamed — ratings bought, competitors brigaded, profiles removed — so nothing here is treated as evidence of what is in a vial. The score is computed from certificates and documentation alone.
- Trustpilot
- Profile removed by TrustpilotThis profile has been removed. The business you’re trying to find goes against our guidelines and is no longer visible on Trustpilot.read 1 Oct 2026
- Finnrick
- Not listedread 1 Oct 2026
Regulatory & enforcement record
No adverse regulatory or enforcement action on record. We record authority actions — FDA warning letters, import alerts, seizures, criminal charges — when located. Self-reported reviews are deliberately not scored, because for this market they can be manufactured.
How this score was calculatedEvery signal, its weight and the arithmetic — reconstructable by handrubric v1.12.0View calculation →Hide ↑
Each criterion is scored out of 100 over the signals we could assess, then weighted into the overall figure. Within a criterion, a signal contributes weight × merit × credit: merit is how good the recorded value is, credit is what its provenance earns — 1.00 for a value with a checkable source, 0 for a value recorded without one. A missing signal counts as a partial gap — half its weight — so a vendor that publishes what others leave blank scores higher, while a blank still costs; a value recorded without a source counts in full and earns nothing, so omitting one can never raise a score. A criterion with no data at all — price, when no price could be indexed — contributes nothing and its weight is not handed to the others, so an unmeasured dimension lowers the ceiling rather than disappearing; the coverage figure, shown alongside, reports how complete the assessment is. The weighted criteria sum to the evidence score; for a vendor published since the rule took effect, the published score is that figure times a tenure factor for time in the index, printed in the total below.
Testing transparency
86.7 / 100 · weight 26% → 22.5
Is the testing lab named? Is it ISO/IEC 17025 accredited? Are certificates of analysis lot-specific, and can anyone read them without an account?
| Signal | Recorded value | Provenance | Weight | Merit | Credit | Points |
|---|---|---|---|---|---|---|
| Testing lab is namedA specific laboratory is identified, so the assay can be traced. | ILS LaboratoriesThe laboratory on the vendor's current certificates. Its own certificate index marks the ILS report as CURRENT (COA-2026-954869, lot ZCSK10, Selank 10mg, 10 June 2026) and the lab-side verify URL printed on it resolves. Earlier lots in the same index were tested at Freedom Diagnostics, which is what the 39 certificate records on file still name. | VerifiedStale1 Oct 2026 · source | 1 | 1.00 | 1.00 × 0.9 stale | 0.90 / 1 |
| Lab holds ISO/IEC 17025 accreditationAccredited to ISO/IEC 17025 for the relevant test scope. | ISO/IEC 17025ILS Laboratories states on the certificate: “Accreditation Scope: ILS Laboratories maintains ISO/IEC 17025 accreditation for activities listed in its published PJLA scope,” and the certificate carries the ilac-MRA and PJLA marks. Recorded for the laboratory, not the vendor. | VerifiedStale1 Oct 2026 · source | 4 | 1.00 | 1.00 × 0.9 stale | 3.60 / 4 |
| Certificate granularityCertificates are lot-specific, so a certificate maps to the vial received. | Per lotVendor states certificates are now issued per lot rather than per batch. Relayed by the operator on 2026-10-13; the site serves a proof-of-work interstitial to every automated request, so no machine-readable corroboration is possible. Recorded as claimed pending a human re-read. | Published13 Oct 2026 | 3 | 1.00 | 1.00 | 3.00 / 3 |
| Certificates readable without an accountCertificates sit behind a self-attestation click-through. No account is required, but crawlers and casual checking are blocked. | Age gate | VerifiedStale28 Aug 2026 · source | 4 | 0.75 | 1.00 × 0.9 stale | 2.70 / 4 |
| Recognised testing laboratory39 of 39 certificates name a real, identifiable testing laboratory (a known lab, or a clearly independent one). Certificates with no named lab, or where the "lab" is just the vendor's own name, do not count — anyone can print those. | 39 / 39 recognised lab | PublishedStale26 Aug 2026 · source | 6 | 1.00 | 1.00 × 0.9 stale | 5.40 / 6 |
| Testing transparency subtotal · coverage 95% | 15.60 / 18 | |||||
Documentation depth
85.5 / 100 · weight 22% → 18.8
Does the vendor publish labeled-versus-actual milligram figures, retain historical certificates, and how large are the discrepancies we can measure?
| Signal | Recorded value | Provenance | Weight | Merit | Credit | Points |
|---|---|---|---|---|---|---|
| Labeled vs. actual mg publishedQuantitative fill data is published, not only a purity percentage. | PublishedAll 39 certificates on file publish both a labelled and an assayed mass, not purity alone — e.g. lot ZCLa2606080081, labelled 15 mg against 16.28 mg assayed, on a Freedom Diagnostics certificate the vendor links publicly. Corroborated against the records themselves. | Verified13 Oct 2026 | 1 | 1.00 | 1.00 | 1.00 / 1 |
| Historical certificates retainedPast certificates remain accessible, so consistency over time can be checked. | RetainedThe vendor publishes a per-product certificate index that marks one report CURRENT and keeps superseded lots published as ARCHIVE, stating: “Archive covers earlier lots and re-tests and stays published for anyone still holding those vials.” Confirmed by direct inspection of that index — three lots visible for one product across two laboratories. Recorded as an editorial check because the page is client-rendered and yields no document links or lot numbers to a crawler. | VerifiedStale1 Oct 2026 | 3 | 1.00 | 1.00 × 0.9 stale | 2.70 / 3 |
| Certificates the vendor publishes44 certificates located, 39 of them indexed with readable results; full credit at six. | 44 published, 39 indexed | PublishedStale26 Aug 2026 · source | 7 | 1.00 | 1.00 × 0.9 stale | 6.30 / 7 |
| Labeled vs. actual discrepancyMean absolute deviation between labeled and assayed mass across 39 certificates. Zero scores full marks; 10% or worse scores nothing. | 9.1% mean | PublishedStale26 Aug 2026 · source | 1 | 0.09 | 1.00 × 0.9 stale | 0.08 / 1 |
| Certificate recencyThe most recent certificate is dated 2026-08-26, about 2 months ago. Certificates within a year score full marks; two years or older scores nothing. | newest 2026-08-26 | PublishedStale26 Aug 2026 · source | 4 | 1.00 | 1.00 × 0.9 stale | 3.60 / 4 |
| Documentation depth subtotal · coverage 98% | 13.68 / 16 | |||||
Price & value
90 / 100 · weight 20% → 18
How the vendor’s per-milligram prices for a standard basket of common compounds compare to the market. Priced below the peer median scores higher; well above it scores lower. An overpriced vendor cannot outrank a comparably documented, better-priced one.
| Signal | Recorded value | Provenance | Weight | Merit | Credit | Points |
|---|---|---|---|---|---|---|
| Price vs market ($/mg)Priced about 58% below the peer median per milligram across a standard basket — better value than the typical vendor. | 42% of medianPrice index 42.2% of peer median across 12 compounds (3 outliers dropped): kpv $2/mg, dsip $2/mg, semax $2/mg, ss-31 $3.75/mg, mots-c $3/mg, selank $2/mg, tb-500 $2.75/mg, bpc-157 $2/mg. | VerifiedStale6 Oct 2026 · source | 10 | 1.00 | 1.00 × 0.9 stale | 9.00 / 10 |
| Price & value subtotal · coverage 90% | 9.00 / 10 | |||||
Track record
100 / 100 · weight 12% → 12
Adverse regulatory or enforcement action on record — warning letters, import alerts, seizures, criminal charges. Authority-issued and publicly verifiable. Self-reported reviews are deliberately not scored: for this market they can be manufactured.
| Signal | Recorded value | Provenance | Weight | Merit | Credit | Points |
|---|---|---|---|---|---|---|
| Regulatory & enforcement recordNo adverse regulatory or enforcement action on record. Authority actions — warning letters, import alerts, seizures, criminal charges — are recorded here when located; self-reported reviews are deliberately not scored, because for this market they can be manufactured. | None on record | Verified8 Nov 2026 | 10 | 1.00 | 1.00 | 10.00 / 10 |
| Track record subtotal · coverage 100% | 10.00 / 10 | |||||
Business transparency
92.9 / 100 · weight 12% → 11.1
Is a legal entity named, is there a physical address, and can the vendor be reached?
| Signal | Recorded value | Provenance | Weight | Merit | Credit | Points |
|---|---|---|---|---|---|---|
| Named legal entityA registered entity is named, so there is someone to hold responsible. | ZC Labs LLC | PublishedStale28 Aug 2026 · source | 3 | 1.00 | 1.00 × 0.9 stale | 2.70 / 3 |
| Physical address publishedA postal address is published. | PO Box 284, Myrtle Beach, SC 29578 | PublishedStale28 Aug 2026 · source | 2 | 1.00 | 1.00 × 0.9 stale | 1.80 / 2 |
| Contact channelsDistinct contact routes we could identify. Full credit at two. | Email (support@zclabs.shop), Live chatVendor states an on-site live chat channel now runs alongside support email. Relayed by the operator on 2026-10-13; not tested for a reply, so recorded as published rather than reachable. | Published13 Oct 2026 | 2 | 1.00 | 1.00 | 2.00 / 2 |
| Business transparency subtotal · coverage 100% | 6.50 / 7 | |||||
Commercial clarity
70 / 100 · weight 8% → 5.6
Is pricing visible without an account, is there a stated guarantee or reship policy, and are payment methods disclosed?
| Signal | Recorded value | Provenance | Weight | Merit | Credit | Points |
|---|---|---|---|---|---|---|
| Pricing visible without an accountPrices are published openly and can be compared. | UngatedPrices are published openly and can be compared without registering. Evidence: “…w all in one premium dashboard. Share Your Link 0 Total Link Clicks 0 Referrals $0.00 Unpaid Commissions 0% Conversion Rate Your Partner Link Customize & share…” | VerifiedStale18 Aug 2026 · source | 4 | 1.00 | 1.00 × 0.9 stale | 3.60 / 4 |
| Guarantee / reship policyWhether the published policy states an outcome in advance or leaves it to discretion. | Stated guaranteePublished on the vendor’s site as a “30-Day Money-Back Quality Guarantee” together with “5 Business Days or $50 Off” on dispatch. Stated unconditionally rather than assessed case by case, which is the distinction this signal draws. | VerifiedStale1 Oct 2026 | 3 | 1.00 | 1.00 × 0.9 stale | 2.70 / 3 |
| Payment methods disclosedNot recorded. | — | Not recorded | 1 | 0.00 | not recorded | 0.00 / 1 |
| Payment offers buyer recourseNot recorded. | — | Not recorded | 3 | 0.00 | not recorded | 0.00 / 3 |
| Commercial clarity subtotal · coverage 57% | 6.30 / 11 | |||||
Total
| Criterion | Subscore | Weight | Contribution | Coverage |
|---|---|---|---|---|
| Testing transparency | 86.7 | 26% | 22.5 | 95% |
| Documentation depth | 85.5 | 22% | 18.8 | 98% |
| Price & value | 90 | 20% | 18 | 90% |
| Track record | 100 | 12% | 12 | 100% |
| Business transparency | 92.9 | 12% | 11.1 | 100% |
| Commercial clarity | 70 | 8% | 5.6 | 57% |
| Evidence scoreThe weighted criteria, before time in the index. | 100% | 88 | 93% | |
| Time in the indexPublished 2026-08-03, before the tenure rule took effect on 2026-10-30: the evidence score counts in full. The rule applies to vendors published from that date on. | day 97 | × 1.0000 | in full | |
| Computed score | 88 | 93% |
Rubric v1.12.0 · 9 verified, 8 claimed, 0 unsourced, 2 not recorded, 13 stale of 19 scored signals
Community
Reviews
Reader reviews are community context only — they are never part of ZC Labs’s computed PepIndex score, which is built from evidence alone.
No reviews yet. .