ZC Labs Coupon Code: PROFPEPTIDE — Save 10% on Single Vials
Use discount code PROFPEPTIDE at ZC Labs to save 10% on your single vials. Prof. Peptide confirmed this rate in its partner dashboard on October 5, 2026.
Key facts
- Price comparison
- 25 of 25 comparable products cost less than the median for the same product and size across every vendor PP tracks — before the code
- Catalog
- 34 products at the 2026-10-16 pull · 25 in Prof. Peptide’s price comparison, 22 of those in stock · Lyophilized vials, sold in single-vial, five-vial and ten-vial packs
- Third-party testing
- Freedom Diagnostics & ILS Laboratories
- Certificates of analysis
- Certificates issued per lot and reached by the lot number printed on the vial rather than from a browsable library; the vendor states no count
- Prof. Peptide’s discount
- 10% off with code PROFPEPTIDE — single vials only
Compare ZC Labs’ prices: Tirzepatide, Retatrutide, Epitalon, BPC-157, GHK-Cu, Melanotan II, NAD+, 5-Amino-1MQ
Overview
ZC Labs (zclabs.shop) sells research compounds as lyophilized vials, each offered as a single vial or in packs of five or ten. Its storefront opens behind an entry page, while its product catalog, certificate lookup and checkout options are published openly, and those open sources are what this page draws on. Prices are in US dollars.
ZC Labs catalog & prices
The catalog spans most of Prof. Peptide's research categories, grouped here by the library's own headings.
- Metabolic & GLP-1
- Retatrutide (ZC-RT), Tirzepatide (ZC-TZ), Cagrilintide (ZC-CG), MOTS-c, 5-Amino-1MQ
- Recovery & Tissue Repair
- BPC-157, TB-500, Wolverine Stack
- Growth Hormone
- Ipamorelin, Tesamorelin, CJC-1295 (no DAC) + Ipamorelin
- Skin Health & Anti-Aging
- GHK-Cu, KLOW, Melanotan I, Melanotan II
- Gut Health & Immunity
- KPV
- Sleep & Recovery
- DSIP
- Longevity
- Epitalon, Glutathione, NAD+, SS-31
- Also listed
- Lipo-C, GHK-Cu as raw powder and as a face cream, laboratory diluent solution, and a vial case
ZC Labs sells retatrutide as ZC-RT, tirzepatide as ZC-TZ and cagrilintide as ZC-CG. That mapping is confirmed to Prof. Peptide directly rather than read off a certificate.
Code PROFPEPTIDE takes 10% off single vials only: ZC Labs never discounts its five- and ten-vial packs, and one discount code applies per order. Every price below is a single-vial price.
Struck-through prices are ZC Labs’ list price; the bold figure is your price once you apply code PROFPEPTIDE at checkout — single vials only. Prices current as of October 16, 2026.
Testing: Labs & Certificates of Analysis
ZC Labs certificates come from two laboratories, Freedom Diagnostics and ILS Laboratories. There is no browsable library: ZC's lookup takes the lot number printed on a vial and returns that lot's certificate, and it refuses an invented lot.
The three certificates below were each read at the laboratory that issued them, after an invented certificate code was refused there first. The two Freedom Diagnostics certificates were read on Freedom Diagnostics' own domain on 5 October 2026, where each names ZC Labs LLC as the client. ILS Laboratories certificate COA-2026-954881 (ZC-TZ 10mg, lot ZCTZ10BL) was read in ILS's own record on 6 October 2026, and every result matches the copy ZC publishes. ILS's record writes its identity as PS-T2, ILS's internal code for tirzepatide; that is confirmed to Prof. Peptide directly, and ILS's own copy of the certificate names tirzepatide, as ZC's does.
Two further ILS certificates that ZC publishes are on ILS's record for ZC Labs but are not shown as verified, because ILS's record and ZC's copy give different heavy-metal and endotoxin results. For COA-2026-954876 (ZC-RT 30mg, lot ZCRT3001), ILS records lead at 0.244 ppm and mercury at 0.0605 ppm, with arsenic, cadmium and chromium not detected; ZC's copy states all five metals not detected. ILS records its endotoxin at 0.021 EU/mL, where ZC's copy prints “NMT 0.05 EU/mL”. For COA-2026-956900 (ZC-RT 10mg, lot White RT), ILS records arsenic at 0.837 ppm, cadmium at 0.0982 ppm, lead at 0.318 ppm, mercury at 0.328 ppm and chromium at 0.226 ppm; ZC's copy states all five not detected. ILS records its endotoxin at 0.027 EU/mL, where ZC's copy prints “NMT 0.05 EU/mL”. On 954876 ILS writes the identity as PS-R3, its internal code for retatrutide, which is not a difference between the two.
Prof. Peptide Verification
Verified · 6 October 2026
We identified the lab, matched the certificates on its own website, and read every test result.
Lab identified
PassedILS Laboratories and Freedom Diagnostics
Certificates verified
Passed3 of 3 matched on each laboratory’s own website, and the same lookup rejected a made-up code.
All three certificates were tested on 26 July, 1 August and 26 August 2026.
Laboratory panel
PassedThe certificates do not agree on one panel name.
- Passed: Purity (HPLC) — 99.54% (limit ≥ 95.0%) — against 98%, Prof. Peptide’s defaultReported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- No specification printed: Net Peptide Content — 10.41 mgReported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- Passed: Identity (ID) — Confirmed (limit PS-T2)Reported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- Passed: Arsenic (As) — Not Detected (limit ≤ 1.5 ppm)Reported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- Passed: Cadmium (Cd) — Not Detected (limit ≤ 0.5 ppm)Reported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- Passed: Lead (Pb) — Not Detected (limit ≤ 1.0 ppm)Reported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- Passed: Mercury (Hg) — Not Detected (limit ≤ 1.5 ppm)Reported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- Passed: Chromium (Cr) — Not Detected (limit ≤ 10.0 ppm)Reported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- No specification printed: Identity (LC-MS) — ZC-TZ 10mg: GLP TZ · ZC-RT 10mg: GLP RTReported on ZC-TZ 10mg (lot ZC-HGH-131), ZC-RT 10mg (lot GLRT-15-201) only.
- No specification printed: Purity (HPLC-UV) — ZC-TZ 10mg: 99.44% · ZC-RT 10mg: 99.80% — against 98%, Prof. Peptide’s defaultReported on ZC-TZ 10mg (lot ZC-HGH-131), ZC-RT 10mg (lot GLRT-15-201) only.
- No specification printed: Net Content — ZC-TZ 10mg: 11.69 mg · ZC-RT 10mg: 10.89 mgReported on ZC-TZ 10mg (lot ZC-HGH-131), ZC-RT 10mg (lot GLRT-15-201) only.
Additional tests
PassedReported on the certificates outside that panel.
- Passed: Sterility (PCR) — No GrowthReported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- Passed: Endotoxin (USP <85>) — 0.125 EU/mL (limit ≤ 0.25 EU/mL)Reported on ZC-TZ 10mg (lot ZCTZ10BL) only.
- No specification printed: Appearance — ZC-TZ 10mg: Good · ZC-TZ 10mg: White Lyophilized Powder · ZC-RT 10mg: White Lyophilized Powder
- Passed: Fentanyl Screen — Not DetectedReported on ZC-TZ 10mg (lot ZCTZ10BL) only.
Payment and shipping
ZC Labs' checkout offers three ways to pay: a Zelle and Cash App option, a cryptocurrency option, and a third checkout option. Code PROFPEPTIDE applies to single vials only, and one discount code can be used per order.
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Frequently Asked Questions
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