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Peptide Sciences: Independent Lab Review (275 COAs Tested)

Lab-verified evidence

Also searched as Peptide SScience

An independent, evidence-first review of Peptide Sciences — wondering if Peptide Sciences is legit? Every number below is sourced from 275 third-party lab certificates of analysis, not vendor marketing. The headline trust stats are free; the batch-by-batch evidence, every certificate, pricing & stock are TitrateLab Pro.

Average purity

91.4%

mean across 271 assayed batches

175 in spec (purity + dose) 96 out of spec

⚠ 96 batches underdosed — worst -100% vs labeled dose

Purity distribution

271 batches · Pro

View batch-by-batch distribution · Pro

Batch ≥90% Below 90% Average

COAs tracked

275

third-party certs

In-spec rate

65%

96 underdosed · worst -100%

Compounds

distinct peptides

Coverage

2024-12 → 2026-07

first → latest test

Dose distribution

271 batches dose-tested

Purity tells you how clean the peptide is. Dose tells you how much you actually got — tested milligrams vs the labeled amount. A vial can be 99% pure and still badly underfilled, which never shows on the purity chart. On-target means within ±10% of label; anything outside (under or over) is off-target.

On-target

49%

within ±10% of label

Median

-7%

vs labeled dose

Worst underfill

-100%

96 batches <−10%

Worst overfill

+114%

42 batches >+10%

View batch-by-batch dose · Pro

On-target (±10%) Off-target (under or over) Median

Compounds tested

14 distinct · 275 certs

Grouped by class, most-tested first. Tap a linked compound for the full research hub.

Melanotan II 12

PT-141 8

Certificates by compound

275 third-party COAs · 14 compounds

Every third-party certificate of analysis TitrateLab tracks for Peptide Sciences, grouped by compound. Tap a thumbnail for the full certificate image; each links through to its public cert page — purity, method, lab, and test date.

Retatrutide

85 COAs · 81.8% avg purity · ↑23% over · ↓46% under

99.9% pure ↓2% 2026-03-10 · LabE

99.9% pure ↓5% 2026-03-02 · LabE

99.4% pure ↑8% 2026-02-22 · LabE

99.7% pure ↓26% 2026-02-15 · LabG

99.9% pure ↑1% 2026-02-13 · LabE

99.9% pure ↓1% 2026-02-11 · LabE

99.8% pure ↑7% 2026-02-10 · LabG

99.6% pure ↑16% 2026-01-26 · LabE

99.7% pure ↑1% 2026-01-26 · LabE

99.7% pure ↑9% 2026-01-07 · LabE

99.7% pure ↑10% 2026-01-01 · LabG

99.7% pure ↑13% 2025-12-16 · LabG

99.6% pure ↑11% 2025-11-04 · LabG

99.5% pure 0% 2025-10-24 · LabG

99.0% pure ↑8% 2025-10-13 · LabG

100.0% pure ↓6% 2025-09-30 · LabE

99.9% pure ↑54% 2025-09-18 · LabE

99.9% pure ↑13% 2025-09-09 · LabD

99.9% pure ↓6% 2025-09-04 · LabE

99.8% pure ↓9% 2025-09-04 · LabE

100.0% pure ↓4% 2025-08-31 · LabE

99.8% pure ↓2% 2025-08-21 · LabE

99.7% pure ↑8% 2025-08-12 · LabA

99.9% pure ↑2% 2025-08-11 · LabE

third-party COA 2025-08-06 · LabE

99.2% pure ↑14% 2025-08-04 · LabD

99.8% pure ↓4% 2025-08-04 · LabE

99.6% pure ↑6% 2025-08-04 · LabA

99.3% pure ↓4% 2025-08-04 · LabD

99.3% pure ↓8% 2025-08-04 · LabD

99.5% pure ↑8% 2025-08-03 · LabA

99.8% pure ↓46% 2025-07-25 · LabE

99.9% pure ↓8% 2025-07-25 · LabE

99.8% pure ↓7% 2025-07-25 · LabE

100.0% pure ↑2% 2025-07-25 · LabE

99.9% pure ↑4% 2025-07-25 · LabE

100.0% pure ↓3% 2025-07-17 · LabE

99.0% pure ↓40% 2025-07-16 · LabF

98.8% pure ↓40% 2025-07-16 · LabF

99.6% pure ↓1% 2025-07-03 · LabE

99.5% pure ↓22% 2025-07-03 · LabE

99.8% pure ↓17% 2025-07-03 · LabE

99.6% pure ↑1% 2025-06-30 · LabE

99.2% pure ↓26% 2025-06-30 · LabE

99.1% pure ↑6% 2025-06-30 · LabA

99.7% pure ↓9% 2025-06-30 · LabA

99.5% pure ↓12% 2025-06-27 · LabA

99.9% pure ↑11% 2025-06-13 · LabF

99.3% pure ↓18% 2025-06-11 · LabE

99.5% pure ↑48% 2025-06-11 · LabE

99.7% pure ↓23% 2025-06-11 · LabE

100.0% pure ↓15% 2025-05-07 · LabE

99.9% pure ↑1% 2025-05-06 · LabC

98.8% pure ↓16% 2025-05-06 · LabE

99.9% pure ↑1% 2025-05-06 · LabC

99.8% pure ↓4% 2025-05-05 · LabB

99.6% pure ↓13% 2025-04-22 · LabD

99.7% pure ↓12% 2025-04-22 · LabD

99.0% pure ↑46% 2025-04-18 · LabD

99.1% pure ↑45% 2025-04-18 · LabD

99.7% pure ↓8% 2025-03-28 · LabC

99.6% pure ↓12% 2025-03-28 · LabC

99.5% pure ↓8% 2025-03-28 · LabC

99.6% pure ↓11% 2025-03-28 · LabC

Tirzepatide

58 COAs · 99.7% avg purity · ↑28% over · ↓25% under

99.9% pure ↓6% 2026-03-04 · LabE

99.4% pure ↑12% 2026-03-03 · LabE

99.9% pure 0% 2026-03-02 · LabE

99.9% pure ↑17% 2026-03-02 · LabE

99.8% pure ↑27% 2026-03-01 · LabG

99.9% pure ↑2% 2026-02-26 · LabE

99.8% pure ↑114% 2026-02-20 · LabG

99.8% pure ↑15% 2026-02-15 · LabG

99.9% pure ↓2% 2026-02-13 · LabE

99.5% pure ↓7% 2026-02-11 · LabE

99.7% pure ↑8% 2026-01-15 · LabG

99.8% pure ↑17% 2025-12-18 · LabG

99.7% pure ↑12% 2025-12-13 · LabG

99.5% pure ↑4% 2025-10-24 · LabG

98.9% pure ↓1% 2025-10-03 · LabE

100.0% pure ↑31% 2025-09-18 · LabE

99.9% pure ↓3% 2025-09-04 · LabE

100.0% pure ↓0% 2025-09-04 · LabE

99.9% pure ↓8% 2025-09-04 · LabE

99.8% pure ↑5% 2025-09-04 · LabE

99.8% pure ↓6% 2025-09-04 · LabE

99.7% pure 0% 2025-08-31 · LabE

99.9% pure ↑6% 2025-08-21 · LabE

100.0% pure ↑2% 2025-08-21 · LabE

98.4% pure ↑12% 2025-08-12 · LabA

99.9% pure ↑10% 2025-08-12 · LabA

third-party COA 2025-08-06 · LabE

99.6% pure ↑7% 2025-08-03 · LabA

100.0% pure ↓0% 2025-07-25 · LabE

100.0% pure ↑2% 2025-07-25 · LabE

99.9% pure ↓2% 2025-07-25 · LabE

100.0% pure ↑1% 2025-07-25 · LabE

99.9% pure 0% 2025-07-25 · LabE

100.0% pure ↓4% 2025-07-25 · LabE

99.9% pure ↓4% 2025-07-25 · LabE

99.6% pure ↓18% 2025-07-23 · LabG

99.9% pure ↓6% 2025-07-17 · LabE

99.8% pure ↑5% 2025-07-16 · LabE

99.7% pure ↑12% 2025-07-16 · LabF

99.6% pure ↑12% 2025-07-16 · LabF

99.0% pure ↑9% 2025-07-08 · LabA

99.9% pure ↓12% 2025-06-30 · LabA

99.7% pure ↑36% 2025-06-29 · LabE

99.7% pure ↓1% 2025-06-20 · LabE

99.9% pure ↑56% 2025-06-11 · LabE

99.8% pure ↓3% 2025-06-11 · LabE

99.2% pure ↓9% 2025-06-09 · LabE

98.7% pure ↓22% 2025-05-07 · LabE

99.2% pure ↓11% 2025-05-05 · LabB

99.2% pure ↓17% 2025-04-22 · LabD

99.1% pure ↓15% 2025-04-22 · LabD

99.9% pure ↓16% 2025-03-28 · LabC

99.9% pure ↓14% 2025-03-28 · LabC

99.6% pure ↓14% 2025-03-28 · LabC

99.8% pure ↓22% 2025-03-28 · LabC 99.9% pure 2026-07-01 · LabE View cert → 99.9% pure 2026-03-04 · LabE View cert →

BPC-157

22 COAs · 95.0% avg purity · ↑14% over · ↓55% under

99.7% pure ↓11% 2026-02-04 · LabG

99.3% pure 0% 2025-11-04 · LabE

100.0% pure ↓13% 2025-10-03 · LabE

100.0% pure ↓2% 2025-09-04 · LabE

99.8% pure ↓1% 2025-08-31 · LabE

99.8% pure ↓2% 2025-08-10 · LabA

99.2% pure ↓3% 2025-07-16 · LabE

99.3% pure ↑9% 2025-05-20 · LabD

99.2% pure ↑10% 2025-05-20 · LabD

99.7% pure ↓9% 2025-05-20 · LabD

98.2% pure ↓6% 2025-05-16 · LabE

98.7% pure ↑11% 2025-05-16 · LabE

100.0% pure ↓8% 2025-05-08 · LabC

99.9% pure ↓9% 2025-05-08 · LabC

99.7% pure ↓12% 2025-05-06 · LabA

99.6% pure ↓13% 2025-05-06 · LabA

100.0% pure ↓18% 2025-02-19 · LabB

99.2% pure ↓11% 2025-02-19 · LabA

99.5% pure ↓8% 2025-02-13 · LabC

99.3% pure ↓5% 2025-02-13 · LabC

99.8% pure ↓8% 2024-12-17 · LabA 0.0% pure 2025-09-18 · LabE View cert →

Semaglutide

21 COAs · 99.7% avg purity · ↑25% over · ↓65% under

99.5% pure ↑12% 2026-03-01 · LabG

99.8% pure ↑20% 2026-01-15 · LabG

third-party COA 2025-08-06 · LabE

98.8% pure ↑13% 2025-07-24 · LabE

99.6% pure ↑6% 2025-07-24 · LabE

100.0% pure ↓20% 2025-07-22 · LabG

99.7% pure ↑12% 2025-07-16 · LabF

99.6% pure ↑15% 2025-07-16 · LabF

99.5% pure ↓11% 2025-05-05 · LabB

99.8% pure ↓9% 2025-05-05 · LabB

99.8% pure ↓13% 2025-05-05 · LabB

99.8% pure ↓11% 2025-05-05 · LabB

99.9% pure ↓14% 2025-03-28 · LabC

99.8% pure ↓14% 2025-03-28 · LabC

99.9% pure ↓20% 2025-03-28 · LabC

100.0% pure ↓16% 2025-03-28 · LabC

100.0% pure ↓6% 2025-02-19 · LabB

99.9% pure ↓12% 2025-02-14 · LabA

99.6% pure ↓10% 2025-02-13 · LabC

99.5% pure ↓10% 2025-02-13 · LabC

99.6% pure ↓28% 2024-12-17 · LabA

GHK-Cu

19 COAs · 99.8% avg purity · ↑11% over · ↓61% under

99.7% pure ↑9% 2026-02-26 · LabE

99.8% pure 0% 2026-02-22 · LabE

99.8% pure ↓13% 2026-02-10 · LabG

100.0% pure ↑21% 2025-11-07 · LabA

99.9% pure ↓11% 2025-08-21 · LabE

third-party COA 2025-08-06 · LabE

99.8% pure ↑6% 2025-08-04 · LabE

99.9% pure ↓1% 2025-08-04 · LabE

99.7% pure ↓10% 2025-07-16 · LabF

99.8% pure ↓11% 2025-07-16 · LabF

99.8% pure ↓9% 2025-07-16 · LabF

99.9% pure ↓19% 2025-07-10 · LabE

99.7% pure ↓27% 2025-07-10 · LabE

99.8% pure ↑5% 2025-05-20 · LabD

99.9% pure ↑5% 2025-05-20 · LabD

99.5% pure ↓10% 2025-05-20 · LabD

100.0% pure ↓14% 2025-05-06 · LabA

100.0% pure ↓15% 2025-05-06 · LabA

Ipamorelin

13 COAs · 99.8% avg purity · ↑8% over · ↓23% under

99.9% pure ↑2% 2026-02-20 · LabE

99.9% pure ↓14% 2025-09-18 · LabE

99.5% pure ↑0% 2025-08-06 · LabF

99.7% pure ↑2% 2025-08-05 · LabA

99.1% pure ↑9% 2025-05-20 · LabD

100.0% pure ↑1% 2025-05-08 · LabC

100.0% pure ↓1% 2025-05-08 · LabC

99.9% pure ↓1% 2025-05-07 · LabA

100.0% pure ↓3% 2025-05-07 · LabA

99.6% pure ↑4% 2025-02-19 · LabB

99.9% pure ↓3% 2025-02-19 · LabA

100.0% pure ↓12% 2025-02-13 · LabC

100.0% pure ↓11% 2025-02-13 · LabC

Melanotan II

12 COAs · 99.4% avg purity · ↑17% over · ↓83% under

99.7% pure ↑34% 2025-05-20 · LabD

99.4% pure ↑32% 2025-05-20 · LabD

99.3% pure ↓45% 2025-02-19 · LabB

98.6% pure ↓51% 2025-02-19 · LabB

99.0% pure ↓50% 2025-02-19 · LabB

99.3% pure ↓47% 2025-02-19 · LabB

99.0% pure ↓47% 2025-02-19 · LabB

99.6% pure ↓8% 2025-02-19 · LabA

99.6% pure ↓9% 2025-02-19 · LabA

99.7% pure ↓9% 2025-02-19 · LabA

99.7% pure ↓10% 2025-02-19 · LabA

CJC-1295

11 COAs · 54.2% avg purity · ↑0% over · ↓100% under

99.8% pure ↓53% 2026-02-15 · LabG

98.7% pure ↓12% 2025-07-17 · LabA

99.6% pure ↓13% 2025-05-20 · LabD

99.1% pure ↓14% 2025-05-20 · LabD

99.4% pure ↓18% 2025-05-07 · LabA

99.5% pure ↓44% 2025-05-07 · LabA 0.0% pure 2026-05-06 · LabE View cert → 0.0% pure 2025-02-21 · LabB View cert → 0.0% pure 2025-02-21 · LabB View cert → 0.0% pure 2025-02-19 · LabA View cert → 0.0% pure 2025-02-19 · LabA View cert →

Tesamorelin

11 COAs · 87.2% avg purity · ↑18% over · ↓36% under

99.0% pure ↑49% 2026-02-20 · LabG

97.2% pure ↓20% 2026-01-15 · LabE

98.9% pure ↑14% 2025-10-09 · LabE

93.2% pure ↓2% 2025-10-09 · LabE

99.9% pure ↑5% 2025-09-13 · LabF

97.0% pure ↑4% 2025-08-05 · LabA

76.4% pure ↓36% 2025-07-24 · LabE

99.4% pure ↓4% 2025-06-13 · LabF

98.6% pure ↓13% 2025-06-13 · LabF 0.0% pure 2026-04-28 · LabE View cert → 99.9% pure 2026-04-28 · LabE View cert →

PT-141

8 COAs · 99.7% avg purity · ↑38% over · ↓12% under

100.0% pure ↑22% 2025-08-12 · LabG

99.7% pure ↓3% 2025-07-31 · LabE

99.6% pure ↑42% 2025-05-21 · LabD

99.4% pure ↑41% 2025-05-21 · LabD

99.6% pure ↑2% 2025-05-21 · LabD

99.8% pure ↑5% 2025-05-21 · LabD

99.9% pure ↓6% 2025-05-07 · LabA

99.8% pure ↓8% 2025-05-07 · LabA

Show 4 more compounds with 3+ certificates

Cagrilintide

4 COAs · 99.2% avg purity · ↑50% over · ↓0% under

98.6% pure ↑8% 2025-11-25 · LabE

99.1% pure ↑3% 2025-08-04 · LabE

99.4% pure ↑1% 2025-06-26 · LabA

99.8% pure ↑7% 2025-06-14 · LabF

Mazdutide

4 COAs · 99.5% avg purity · ↑50% over · ↓0% under

98.7% pure ↓7% 2025-11-25 · LabE

99.6% pure ↓5% 2025-07-24 · LabE

99.6% pure ↑12% 2025-07-16 · LabF

99.8% pure ↑12% 2025-07-16 · LabF

Survodutide

4 COAs · 99.8% avg purity · ↑0% over · ↓100% under

99.9% pure ↓18% 2025-11-25 · LabE

99.6% pure ↓18% 2025-07-24 · LabE

99.8% pure ↓7% 2025-07-16 · LabF

99.8% pure ↓16% 2025-07-16 · LabF

Sermorelin

3 COAs · 97.6% avg purity · ↑0% over · ↓100% under

98.7% pure ↓8% 2026-02-20 · LabE

99.3% pure ↓10% 2025-08-05 · LabD

94.8% pure ↓16% 2025-07-24 · LabE

Compound explorer

14 compounds · 275 certificates

Every compound Peptide Sciences has certificates for. Switch the measure — each one reports how many certificates it is actually based on, and compounds never tested for that measure drop out rather than showing as zero.

Purity & dose — Pro

14 compounds, 85 certificates on the busiest

Retatrutide 85

Tirzepatide 58

See its 58 certificates above ↑

BPC-157 22

See its 22 certificates above ↑

Semaglutide 21

See its 21 certificates above ↑

GHK-Cu 19

See its 19 certificates above ↑

Ipamorelin 13

See its 13 certificates above ↑

Melanotan II 12

See its 12 certificates above ↑

CJC-1295 11

See its 11 certificates above ↑

Tesamorelin 11

See its 11 certificates above ↑

PT-141 8

See its 8 certificates above ↑

Cagrilintide 4

See its 4 certificates above ↑

Mazdutide 4

See its 4 certificates above ↑

Survodutide 4

See its 4 certificates above ↑

Sermorelin 3

See its 3 certificates above ↑

Community reviews

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Frequently asked

purity & lab evidence

Is Peptide Sciences legit?

TitrateLab tracks 275 third-party lab certificates of analysis for Peptide Sciences, averaging 91.4% tested purity across 271 assayed batches, with 65% of those batches in spec on both purity (≥90%) and labeled dose (filled to within 10% of the labeled amount); 96 assayed batches were significantly underdosed (worst -100% vs the labeled amount) (tests dated 2024-12-17 to 2026-07-01). These are purity analytics from independent certificates, not vendor marketing — TitrateLab does not rank or endorse vendors, and this is research-use-only information, not a recommendation to purchase or use any product.

What is Peptide Sciences's average tested purity?

Across the 271 assayed batches TitrateLab tracks for Peptide Sciences, the mean third-party-tested purity is 91.4%. Purity is measured on the specific batches that were submitted for analysis and is not a guarantee for any other lot.

How many lab certificates does TitrateLab track for Peptide Sciences?

TitrateLab tracks 275 published third-party certificates of analysis for Peptide Sciences spanning 14 distinct compounds. Each certificate links to its own public page with the purity, test method, issuing lab, and test date.

What share of Peptide Sciences's tested batches are in spec on purity and dose?

65% of the 271 assayed batches TitrateLab tracks for Peptide Sciences (175 of 271) were in spec on BOTH tested purity (at or above 90%) and labeled dose (filled to within 10% of the labeled amount). 96 assayed batches were significantly underdosed against the label (worst -100%), so they are counted as out of spec even where tested purity was high. This reflects only the batches that were tested and is analytic information for research use, not a quality guarantee for any order.

Answers are derived from the third-party lab certificates TitrateLab tracks for this vendor and describe tested purity only. This is research-use-only information, not medical advice and not a recommendation to purchase or use any product.

Head to head Compare Peptide Sciences vs Peptaris Side-by-side lab purity, in-spec rate & COA count — independent evidence.

How this is sourced. TitrateLab tracks certificates of analysis posted by the community and verified against the issuing lab. Purity, test dates, and compound names shown here are the same facts published on each public certificate page — aggregated, never edited. The in-spec rate counts a batch only when it clears both purity (≥90%) and labeled dose (filled to within 10% of label, where dose data exists); it reflects the batches that were tested and is not a guarantee of every order. Scores come only from lab data — no vendor pays for placement, and customer orders or Pro never move a grade. Browse the COA corpus →

Peptide Sciences: Independent Lab Review (275 COAs Tested)

The batch-by-batch distribution is a Pro feature

Dose distribution

The batch-by-batch dose distribution is a Pro feature

Compounds tested

Certificates by compound

Retatrutide

Tirzepatide

BPC-157

Semaglutide

GHK-Cu

Ipamorelin

Melanotan II

CJC-1295

Tesamorelin

PT-141

Cagrilintide

Mazdutide

Survodutide

Sermorelin

Compound explorer

Community reviews

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