Zen Peptides reviews
24 independent lab tests across 4 products · 99.0% average purity
- 24 HPLC samples across 4 products
- Catalog avg purity 99.0%
- zen-peptide.com
- Independent testing, no pay-to-rank
Boren Health independently tests products and verifies reviews. Public methodology, no pay-to-rank.
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What the testing shows
Across 23 measured samples from Zen Peptides, 5 came in more than 5% under the quantity on the label (22%). Another 8 measured more than 5% over. Purity across 23 readings ran from 85.72% to 99.95%, median 99.78%. Samples span Oct 2025 to Jul 2026.
- Under label
- 5/23
- Median purity
- 99.78%
- Latest sample
- Jul 2026
- Ships from
- Singapore
more than 5% short
85.72%–99.95% range
first tested Oct 2025
per vendor listing
Lab testing results
Independent results across 4 products.
Tested products
| Product | Grade | Tests | Avg | Range | Latest | Price | $/mg |
|---|---|---|---|---|---|---|---|
| GHK-Cu | AGREAT | 4 | 100.0% | 99.9% – 99.9% | 12/17/2025 | — | — |
| Tirzepatide | COKAY | 4 | 75.0% | 99.5% – 99.9% | 3/4/2026 | — | — |
| Retatrutide | DPOOR | 10 | 60.0% | 98.8% – 99.8% | 7/20/2026 | — | — |
| Tesamorelin | EBAD | 6 | 33.3% | 85.7% – 99.9% | 2/19/2026 | — | — |
Individual lab tests
Date
7/20/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No label / Silver crimp / Black cap
Date
3/4/2026
Purity
99.9%
Quantity
60 mg → 59.7 mg
Lab
Krause Analytical
Vial
Silver Label / Copper Crimp / Clear Cap
Date
3/3/2026
Purity
99.81%
Quantity
10 mg → 9.88 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Clear Blue Cap
Date
3/3/2026
Purity
99.78%
Quantity
30 mg → 25 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Black Cap
Date
2/20/2026
Purity
99.81%
Quantity
30 mg → 35.2 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Orange Cap
Date
2/19/2026
Purity
98%
Quantity
10 mg → 8.51 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / White Cap
Date
2/15/2026
Purity
99.7%
Quantity
10 mg → 12.6 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / White Cap
Date
2/10/2026
Purity
99.7%
Quantity
10 mg → 10.5 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Green Cap
Date
1/19/2026
Purity
85.72%
Quantity
10 mg → 8.97 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Black Cap
Date
1/7/2026
Purity
99.8%
Quantity
10 mg → 9.8 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Green Cap
Date
1/1/2026
Purity
99.6%
Quantity
15 mg → 17.5 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Clear Cap
Date
12/17/2025
Purity
99.87%
Quantity
20 mg → 19.7 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Violet Cap
Date
12/17/2025
Purity
99.95%
Quantity
50 mg → 59.1 mg
Lab
Krause Analytical
Vial
No Label / Copper Crimp / Clear Cap
Date
12/13/2025
Purity
99.5%
Quantity
10 mg → 4.13 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Yellow Cap
Date
12/10/2025
Purity
99.2%
Quantity
10 mg → 8.65 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Green Cap
Date
11/18/2025
Purity
99.95%
Quantity
50 mg → 51.7 mg
Lab
Krause Analytical
Vial
White Label / Copper Crimp / Clear Cap
Date
11/17/2025
Purity
99.81%
Quantity
10 mg → 9.56 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Clear Blue Cap
Date
11/17/2025
Purity
98.4%
Quantity
20 mg → 25.7 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Red Cap
Date
11/17/2025
Purity
98.93%
Quantity
5 mg → 5.14 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Yellow Cap
Date
11/4/2025
Purity
99.95%
Quantity
100 mg → 105 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Clear Cap
Date
11/4/2025
Purity
99.47%
Quantity
10 mg → 9.78 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / White Cap
Date
10/24/2025
Purity
99.8%
Quantity
10 mg → 11.29 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / White Cap
Date
10/23/2025
Purity
99.95%
Quantity
50 mg → 53.2 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / White Cap
Date
10/23/2025
Purity
98.83%
Quantity
10 mg → 10.6 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Green Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideNo label / Silver crimp / Black cap | 7/20/2026 | — | — | BTLabs | View | |
| TirzepatideSilver Label / Copper Crimp / Clear Cap | 3/4/2026 | 10.0 | 99.9% | 60 mg → 59.7 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Clear Blue Cap | 3/3/2026 | 10.0 | 99.81% | 10 mg → 9.88 mg | Krause Analytical | View |
| RetatrutideWhite Label / Silver Crimp / Black Cap | 3/3/2026 | 10.0 | 99.78% | 30 mg → 25 mg | Krause Analytical | View |
| TirzepatideWhite Label / Silver Crimp / Orange Cap | 2/20/2026 | 10.0 | 99.81% | 30 mg → 35.2 mg | Krause Analytical | View |
| TesamorelinWhite Label / Silver Crimp / White Cap | 2/19/2026 | 9.8 | 98% | 10 mg → 8.51 mg | Krause Analytical | View |
| TesamorelinNo Label / Silver Crimp / White Cap | 2/15/2026 | 10.0 | 99.7% | 10 mg → 12.6 mg | BTLabs | View |
| RetatrutideNo Label / Silver Crimp / Green Cap | 2/10/2026 | 10.0 | 99.7% | 10 mg → 10.5 mg | BTLabs | View |
| TesamorelinNo Label / Silver Crimp / Black Cap | 1/19/2026 | 8.6 | 85.72% | 10 mg → 8.97 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Green Cap | 1/7/2026 | 10.0 | 99.8% | 10 mg → 9.8 mg | BTLabs | View |
| RetatrutideNo Label / Silver Crimp / Clear Cap | 1/1/2026 | 10.0 | 99.6% | 15 mg → 17.5 mg | BTLabs | View |
| TesamorelinNo Label / Silver Crimp / Violet Cap | 12/17/2025 | 10.0 | 99.87% | 20 mg → 19.7 mg | Krause Analytical | View |
| GHK-CuNo Label / Copper Crimp / Clear Cap | 12/17/2025 | 10.0 | 99.95% | 50 mg → 59.1 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / Yellow Cap | 12/13/2025 | 9.9 | 99.5% | 10 mg → 4.13 mg | BTLabs | View |
| RetatrutideNo Label / Silver Crimp / Green Cap | 12/10/2025 | 9.9 | 99.2% | 10 mg → 8.65 mg | BTLabs | View |
| GHK-CuWhite Label / Copper Crimp / Clear Cap | 11/18/2025 | 10.0 | 99.95% | 50 mg → 51.7 mg | Krause Analytical | View |
| RetatrutideWhite Label / Silver Crimp / Clear Blue Cap | 11/17/2025 | 10.0 | 99.81% | 10 mg → 9.56 mg | Krause Analytical | View |
| TesamorelinWhite Label / Silver Crimp / Red Cap | 11/17/2025 | 9.8 | 98.4% | 20 mg → 25.7 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Yellow Cap | 11/17/2025 | 9.9 | 98.93% | 5 mg → 5.14 mg | Krause Analytical | View |
| GHK-CuNo Label / Silver Crimp / Clear Cap | 11/4/2025 | 10.0 | 99.95% | 100 mg → 105 mg | Krause Analytical | View |
| TesamorelinNo Label / Silver Crimp / White Cap | 11/4/2025 | 9.9 | 99.47% | 10 mg → 9.78 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / White Cap | 10/24/2025 | 10.0 | 99.8% | 10 mg → 11.29 mg | BTLabs | View |
| GHK-CuNo Label / Silver Crimp / White Cap | 10/23/2025 | 10.0 | 99.95% | 50 mg → 53.2 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Green Cap | 10/23/2025 | 9.9 | 98.83% | 10 mg → 10.6 mg | Krause Analytical | View |
About Zen Peptides
Finnrick has tested 24 samples from Zen Peptides across 4 products.
Contact
- Singapore
- zen-peptide.com