Peptide Testing & Certificates of Analysis (COA)
Every batch is tested before release by an independent, accredited U.S. laboratory. Lab results published for 19 products — find yours by lot number. Find your 2DayPeptides lot’s purity results, test date and testing laboratory.
Look Up Your COA
Enter the lot number from your product vial to view purity results, test date, and lab verification data for your batch.
Our testing standard
Every batch is tested before release by an independent, accredited U.S. laboratory. Lab results published for 19 products — find yours by lot number. Match your vial to its report and see the evidence behind your research materials.
Why we test
Know what’s in the vial
Mass spectrometry supports identity confirmation by comparing observed and expected mass.
Know how pure it is
HPLC separates a sample’s components to measure chromatographic purity.
Know which lot you have
Lot-level traceability connects the number on your vial to its laboratory results.
How we test
Published lot records put purity results, test dates and laboratory details in one place.
UPLC purity
Liquid chromatography separates the sample’s components. The reported percentage shows chromatographic purity under the laboratory’s method.
Mass spectrometry identity
Measured mass-to-charge ratios are compared with the expected compound to assess molecular identity. Each lot report records its findings.
Tested by Horizon Analytical, Horizontal Analytical
Tested by Horizon Analytical, an independent, accredited U.S. laboratory; Horizontal Analytical, an independent, accredited U.S. laboratory. Each lot lists its testing laboratory alongside the results.
Active lot results
- Active products with a COA
- 76%
- Lots with dated test results
- 23
- Compounds with test results
- 19
- Average purity across 23 lots
- 99.338%
- Lowest reported
- 99.15%
- Latest test
- Jun 20, 2026
Calculated from the active records listed below. Purity statistics use 23 exact numeric results; missing values and results reported only as a bound are excluded.
How to read your COA
- Lot number
- The identifier that connects a vial to its batch record. Match the number on your label to the report.
- Test date
- When the laboratory performed the test. Separate from manufacture and expiry dates.
- HPLC purity (%)
- The share of measured chromatographic signal attributed to the target compound. Purity is separate from the quantity in the vial.
- Mass spec identity
- Observed mass compared with expected mass to assess molecular identity.
- Testing laboratory
- The laboratory that performed the testing recorded on your report.
Active lot index
Browse the published records by compound, then match the lot number to your vial. Older records remain available through the lookup above.
GLP-3
Lot 2P-8032676-P
- Purity
- 99.5%
- Test date
- Jun 20, 2026
- Laboratory
- Horizon Analytical
KLOW
Lot 2P-7626298-P
- Purity
- 99.32%
- Test date
- Jun 20, 2026
- Laboratory
- Horizon Analytical
Tesamorelin
Lot 2P-7980975-P
- Purity
- 99.19%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
Kisspeptin
Lot 2P-8975198-P
- Purity
- 99.45%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
GLP-2
Lot 2P-2576448-P
- Purity
- 99.35%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
TB-500
Lot 2P-5928420-P
- Purity
- 99.15%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
Oxytocin
Lot 2P-4275312-P
- Purity
- 99.41%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
Thymosin Alpha 1
Lot 2P-1947064-P
- Purity
- 99.32%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
Ipamorelin
Lot 2P-5192680-P
- Purity
- 99.15%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
Hexarelin
Lot 2P-7132129-P
- Purity
- 99.19%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
NAD+
Lot 2P-7932744-P
- Purity
- 99.39%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
GHK-Cu
Lot 2P-5920245-P
- Purity
- 99.46%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
AOD-9604
Lot 2P-3713888-P
- Purity
- 99.65%
- Test date
- May 8, 2026
- Laboratory
- Horizon Analytical
Semax
Lot 2P-8837484
- Purity
- 99.35%
- Test date
- Mar 22, 2026
- Laboratory
- Horizontal Analytical
Selank
Lot 2P-9715345
- Purity
- 99.22%
- Test date
- Mar 22, 2026
- Laboratory
- Horizontal Analytical
NAD+
Lot 2P-1692066
- Purity
- 99.45%
- Test date
- Mar 15, 2026
- Laboratory
- Horizontal Analytical
BPC-157 + TB-500
Lot 2P-9562504
- Purity
- 99.28%
- Test date
- Mar 15, 2026
- Laboratory
- Horizontal Analytical
GLP-2
Lot 2P-9127066
- Purity
- 99.34%
- Test date
- Mar 14, 2026
- Laboratory
- Horizontal Analytical
MOTS-C
Lot 2P-8561878
- Purity
- 99.2%
- Test date
- Feb 28, 2026
- Laboratory
- Horizon Analytical
BPC-157
Lot 2P-7405081
- Purity
- 99.24%
- Test date
- Feb 28, 2026
- Laboratory
- Horizon Analytical
Tesamorelin
Lot 2P-4212177
- Purity
- 99.38%
- Test date
- Feb 5, 2026
- Laboratory
- Horizon Analytical
GHK-Cu
Lot 2P-8800019
- Purity
- 99.57%
- Test date
- Jan 27, 2026
- Laboratory
- Horizon Analytical
Sermorelin
Lot 2P-9912173
- Purity
- 99.21%
- Test date
- Jan 27, 2026
- Laboratory
- Horizontal Analytical
CJC-1295 + Ipamorelin
Lot 2P-7708511
- Purity
- Not recorded
- Test date
- Not recorded
- Laboratory
- Not recorded
24 active lots · Page 1 of 1
Testing questions
What is HPLC purity testing?
High-performance liquid chromatography (HPLC) separates the components in a sample. The purity percentage is the share of measured chromatographic signal attributed to the target compound. It measures chromatographic purity, not the quantity in a vial.
What does mass spectrometry confirm?
Mass spectrometry measures mass-to-charge ratios. Comparing the observed and expected mass supports confirmation of the sample’s molecular identity. Your lot report records the method and identity findings.
Who tests 2DayPeptides peptides?
Tested by Horizon Analytical, an independent, accredited U.S. laboratory; Horizontal Analytical, an independent, accredited U.S. laboratory. Each lot lists its testing laboratory alongside the results.
How do I find the COA for my vial?
Enter the lot number printed on your vial in the COA lookup, or browse the active lot index by compound. If you cannot find a match, contact support with your lot and order number.
Is every batch tested?
Every batch is tested before release by an independent, accredited U.S. laboratory. Lab results are published per lot. 19 of 25 active products (76%) have an active COA in this index. If your lot is missing, enter its number in the lookup above or contact support with your lot and order number.
What purity do your peptides test at?
Average purity across 23 lots: 99.338%. Lowest reported: 99.15%. These figures use exact numeric results from active lot records; missing results and results reported only as a bound are excluded. Find your lot for its individual result.
For Research Use Only
All 2DayPeptides products are intended solely for in vitro laboratory research by qualified professionals. COA documentation is provided to support research records and quality verification. These products have not been evaluated by the FDA and are not approved for human or veterinary use.
Need Help Finding Your COA?
Contact our support team with your order number and lot number. Our team can help locate the matching documentation.
