Published lab records · Calculated grades. Labelled affiliate placements.
Vendor review · peptidesciences.com

Peptide Sciences reviews

Peptide Sciences review: our rating is F (9/100), from 126 independently tested vials across 10 peptides; 111 of 126 were the labelled peptide and 78 met our pass mark. Newest test: Jul 20, 2026. Peptide Vendor Reviews publishes each of these 126 results with its certificate.

Grades describe the samples tested; some links earn us a commission, but never change a vendor's grade. How we grade

Is Peptide Sciences still open? Shutdown status

Peptide Sciences says it voluntarily discontinued all research-use-only product sales in March 2026, and that it has not authorized any third party, replacement website or successor to sell on its behalf. Source: Notice on peptidesciences.com, checked Oct 27, 2026.

Compiled from independent lab data · not yet reviewed by our editorsUpdated

Is Peptide Sciences legit? Evidence assessment

Evidence assessment

F

Grade F

Our rating · 9/100

In the reviewed independent records, 15 of 126 vials were the wrong peptide, and 45 of 111 were within 10% of the labelled dose. These results describe the tested samples, not all products or future batches.

Peptide Sciences isn't taking orders. Alternative: Peptide Partners, graded A

Visit Peptide Partners
See alternatives
  • Capped at F: test results graded F.
How we grade

Test results

What was actually in the vials?

F

Failing · 53/100

Results often failed: wrong peptide, low purity or far-off doses.

  • 15 of 126 vials were not the peptide on the label.
  • 45 of 111 held within 10% of the labelled dose.
  • Purity 98.62–100% (good).
  • 48 of 126 failed our basic check: purity under 99.5% (31), identity not confirmed (15), dose more than 35% off the label (11).
More on test results →

Strength of evidence

How much can you rely on these results?

A

Strong · 87/100

The evidence meets our A-band thresholds for sample count, recency and sourcing.

  • 126 vials tested by independent labs. We like to see 10 or more.
  • 90 of 126 were bought by the tester like a normal customer; 36 of 126 were sent in anonymously by buyers. We can't confirm who bought each anonymous vial.
  • 112 of 126 can be traced to a batch.
  • 3 of 126 were checked for contamination.
More on strength of evidence →

Shop reputation

Is the shop itself trustworthy?

N/A

Not reviewed yet

We haven't researched this shop's business record or customer complaints yet.

  • Not part of this grade until we've checked it.
More on shop reputation →

Products

Peptide Sciences lab test results by peptide

Each product gets its own grade from the available lab records under the same published rubric. Alternative vendors are shown alongside with their compound-level grades. A grade describes the tested samples only.

  • Retatrutide

    Weak assessment

    last tested Jun 17, 2026

    $17.81/mg · Estimated price · as of Sep 12, 2026

    F
    Vials tested
    37
    Right peptide
    10 wrong
    Purity
    98.83–100%
    Labelled quantity
    13 of 27 within 10%
    See each vialFurthest off: +45.83% (batch RET7920231109-6)

    Higher-rated vendor

    A

    Peptide Partners

    32 Retatrutide vials tested · last Oct 14, 2026

    $4.79/mg · 73% cheaper than Peptide Sciences

    Estimated price · as of Sep 6, 2026

    Visit shopRead review

  • Tirzepatide

    Strong assessment

    last tested Jul 1, 2026

    $6.67/mg · Estimated price · as of Mar 28, 2026

    B
    Vials tested
    17
    Right peptide
    All
    Purity
    98.73–99.947%
    Labelled quantity
    2 of 17 within 10%
    See each vialFurthest off: +114%

    Higher-rated vendor

    A

    Guangzhou Jeep Biotechnology JEEP

    16 Tirzepatide vials tested · last Aug 4, 2026

    $0.42/mg · 94% cheaper than Peptide Sciences

    Estimated price · as of Aug 22, 2026

    Visit shopRead review

  • Semaglutide

    Strong assessment

    last tested Mar 1, 2026

    $28.33/mg · Estimated price · as of Jul 22, 2025

    B
    Vials tested
    15
    Right peptide
    All
    Purity
    99.474–100%
    Labelled quantity
    4 of 15 within 10%
    See each vialFurthest off: -28% (batch VIM9820240105-3)

    Same-grade vendor

    B

    Royal Peptides

    8 Semaglutide vials tested · last Jul 23, 2026

    $2.00/mg · 93% cheaper than Peptide Sciences

    cheapest: 10 × 30 mg pack

    Visit shopRead review

  • BPC-157

    Strong assessment

    last tested Feb 4, 2026

    $9.50/mg · Estimated price · as of Jan 23, 2026

    B
    Vials tested
    13
    Right peptide
    All
    Purity
    99.221–100%
    Labelled quantity
    7 of 13 within 10%
    See each vialFurthest off: -17.6% (batch VI220240603-5)

    Same-grade vendor

    B

    HK Peptides

    22 BPC-157 vials tested · last Sep 9, 2026

    $0.82/mg · 91% cheaper than Peptide Sciences

    Estimated price · as of Aug 14, 2026

    Visit shopRead review

  • Melanotan II

    Mixed assessment

    last tested Feb 19, 2025

    $4.67/mg · Estimated price · as of Feb 19, 2025

    C
    Vials tested
    10
    Right peptide
    All
    Purity
    98.62–99.69%
    Labelled quantity
    4 of 10 within 10%
    See each vialFurthest off: -51% (batch 052462A)

    Higher-rated vendor

    B

    HK Peptides

    12 Melanotan II vials tested · last Jul 9, 2026

    $0.41/mg · 91% cheaper than Peptide Sciences

    Estimated price · as of Feb 1, 2026

    Visit shopRead review

  • CJC-1295

    Weak assessment

    last tested May 6, 2026

    $11.20/mg · Estimated price · as of May 20, 2025

    F
    Vials tested
    9
    Right peptide
    3 wrong
    Purity
    98.694–99.8%
    Labelled quantity
    0 of 6 within 10%
    See each vialFurthest off: -53%

    Higher-rated vendor

    B

    Qing Li Peptide

    19 CJC-1295 vials tested · last Aug 12, 2026

    $1.40/mg · 87% cheaper than Peptide Sciences

    Estimated price · as of Jul 21, 2026

    Visit shopRead review

  • Ipamorelin

    Strong assessment

    last tested May 20, 2025

    $8.80/mg · Estimated price · as of May 20, 2025

    B
    Vials tested
    9
    Right peptide
    All
    Purity
    99.127–99.967%
    Labelled quantity
    7 of 9 within 10%
    See each vialFurthest off: -11.6% (batch VI720240129-5)

    Higher-rated vendor

    A

    Reta-Peptide

    16 Ipamorelin vials tested · last Jul 20, 2026

    $0.75/mg · 91% cheaper than Peptide Sciences

    cheapest: 10 × 10 mg pack

    Visit shopRead review

  • GHK-Cu

    Strong assessment

    last tested Feb 26, 2026

    $1.30/mg · Estimated price · as of Sep 12, 2026

    B
    Vials tested
    6
    Right peptide
    All
    Purity
    99.7–99.988%
    Labelled quantity
    3 of 6 within 10%
    See each vialFurthest off: -14.78% (batch 0000211W)

    Higher-rated vendor

    A

    Reta-Peptide

    28 GHK-Cu vials tested · last Sep 15, 2026

    $0.06/mg · 95% cheaper than Peptide Sciences

    Estimated price · as of Jul 1, 2026

    Visit shopRead review

  • PT-141

    Strong assessment

    last tested Aug 12, 2025

    $5.50/mg · Estimated price · as of Aug 12, 2025

    B
    Vials tested
    6
    Right peptide
    All
    Purity
    99.636–100%
    Labelled quantity
    5 of 6 within 10%
    See each vialFurthest off: +22% (batch VI1420241021-10)

    Same-grade vendor

    B

    Qing Li Peptide

    7 PT-141 vials tested · last Sep 4, 2026

    Visit shopRead review

  • Tesamorelin

    Weak assessment

    last tested Jul 20, 2026

    $10.42/mg · Estimated price · as of Mar 7, 2026

    F
    Vials tested
    4
    Right peptide
    2 wrong
    Purity
    98.9–99%
    Labelled quantity
    0 of 2 within 10%
    See each vialFurthest off: +49%

    Higher-rated vendor

    B

    Shanghai ERP peptide Biotechnology

    13 Tesamorelin vials tested · last Oct 12, 2026

    $1.45/mg · 86% cheaper than Peptide Sciences

    cheapest: 10 × 20 mg pack

    Visit shopRead review

  • TB-500

    Never tested

    $17.00/mg · Estimated price · as of Feb 9, 2026

    N/A

    No lab has tested this shop's TB-500, so we can't say what's in the vial.

    Graded vendor

    B

    Peptide Partners

    11 TB-500 vials tested · last Aug 5, 2026

    $4.90/mg · 71% cheaper than Peptide Sciences

    cheapest: 10 × 10 mg pack

    Visit shopRead review

Vendors shown must meet our published grading criteria for that peptide and follow the shared quality ranking. Partner status never changes the order. We earn a commission on purchases through partner links. Shops can't pay for a grade, and inclusion is not an endorsement.

Quick facts

Peptide Sciences reviews: key findings

From 126 vials tested by independent labs. These results describe the tested vials, not every vial the shop sells. Tap i for test definitions and thresholds.

What was in the vials

Right peptide?

15 wrong

15 of 126 vials were not the peptide on the label

Amount matches label?

45 of 111 vials

Within 10% of the labelled amount

Peptide purity

98.62–100%

Purity across 111 tested vials

Failed our quality check

48 of 126 vials

Wrong peptide; Purity below 99.5%; Amount more than 35% off label

Testing coverage and limitations

Vials tested for contaminants

3 of 126 vials

Checked for bacterial toxins and heavy metals

Vials with a batch number

112 of 126 vials

Tested vials linked to a production run

Bought anonymously?

90 of 126 vials

Confirmed anonymous purchases

Most recent lab test

Jul 2026

4 months ago

Test results

What the lab found

126 vials tested by 7 labs, Dec 17, 2024 to Jul 20, 2026. Results often failed: wrong peptide, low purity or far-off doses.

How close each vial was to the dose on its label

0% means exactly the amount on the label. Green band: within 10%, which is good. Dashed lines: 35% over or under, where a vial fails our basic check.

What looks good

What to watch

External vendor records

The records include Peptide Partners, with sample grade A. Links are not endorsements.

Visit shop

Strength of evidence

What supports these results?

A lab result only describes the vial that was tested. This grade shows how well the tested vials represent what you would actually receive.
A

Strong evidence

Just 3 checked for contamination. The evidence meets our A-band thresholds for sample count, recency and sourcing.

  • How many vials were tested126 vials. We like to see 10 or more.Good
  • Who bought them90 of 126 bought by the tester like a normal customer; 36 of 126 sent in anonymously by buyers.Good
  • Batch numbers112 of 126 vials.Good
  • How recentLatest test 114 days before our check.Good
  • Lab reports126 of 126 link to the lab report; none confirmed with the lab yet.Good
  • Checked for contamination3 of 126 vials.Poor
  • Different labs7 labs.Good
What this review can't tell you (3)
  • 15 records have no purity figure.
  • 15 records have no quantity measurement.
  • Lab results describe the vials that were tested, not future batches or other products, and say nothing about whether a peptide is safe or suitable for you.

Shop reputation

Peptide Sciences store status, shipping and payment

Kept apart from the lab results: a smooth delivery says nothing about what's in a vial, and a clean lab report says nothing about refunds.

Not reviewed yet

We haven't checked this shop's storefront, registration, news or complaint records yet, so this part isn't graded and doesn't count toward the verdict. Know something we should look at? Tell us.

All tests

Every Peptide Sciences vial tested

A vial passes if it's the right peptide, at least 99.5% pure and within 35% of the labelled dose. Tap a vial for its batch, sender and lab report.

Comparison

Peptide Sciences alternatives with lab tests

Same peptide, same 12 months, same rules for every shop. Check the number of vials before comparing rates.

Tesamorelin

Jul 20, 2025 – Jul 20, 2026 · 96 shops tested

  • Peptide Sciences

    4 vials · typical error 31.3%

    Passed
    0%0/4
    Quantity within 10%
    0%0/2

  • HK Peptides

    33 vials · typical error 5.5%

    Passed
    45%15/33
    Quantity within 10%
    77%23/30
    Visit shop

  • Wuhan Wansheng Biotechnology

    26 vials · typical error 6%

    Passed
    23%6/26
    Quantity within 10%
    72%18/25
    Visit shop

  • Nexaph

    25 vials · typical error 13.5%

    Passed
    32%8/25
    Quantity within 10%
    38%9/24
    Visit shop

  • LiliPeptide

    22 vials · typical error 8.5%

    Passed
    55%12/22
    Quantity within 10%
    52%11/21

Market average across all 96 shops: 46% passed, 56% within 10% of the label.

Peptide Sciences has only 4 vials here, too few to rank fairly against shops with dozens.

The 4 open shops with the most Tesamorelin records in the same window, chosen by record count only.

Methodology

How we grade

Three separate scores out of 100, combined into one letter grade. Great reviews can never make up for bad lab results.

Lab results45%

How pure each vial was and how close it came to the labelled dose. Recent tests count more; a wrong peptide scores zero.

Strength of evidence25%

How many vials were tested, whether they were bought anonymously, and whether the reports can be checked.

Shop reputation30%

Starts at 100 and loses points for each problem we can source. Customer reviews never change a lab result.

Grade scale

  • A90+
  • B80+
  • C70+
  • D60+
  • F<60

Evidence uses lower cut-offs, because anonymous purchases are rare across the market.

Limits on the overall grade

  • Never higher than the lab-results grade.
  • D at most if the shop can't be ordered from, has a critical problem or fails its lab tests.
  • C at most if the evidence is very weak.
  • No lab results means no grade.
Full scoring rulesPoints, caps and cut-offs behind each score

Lab results

  • Each vial scores out of 100: half for purity, half for how close it was to the labelled dose.
  • A wrong peptide scores zero, and costs the shop 1.5 more points for every 1% of vials affected.
  • A vial that tests positive for bacterial toxins can score no more than 30.
  • Recent vials count more than old ones. Reports the shop published itself count 50%.
  • With only a few vials, we hold back: one perfect vial can't earn an A.

Strength of evidence

  • How many vials were tested (up to 35 points).
  • Whether they were bought anonymously, like a customer would (up to 20).
  • Batch numbers, how recent the tests are, a lab report you can check, contamination tests and more than one lab (the remaining 45).
  • Cut-offs: A 80+ · B 70+ · C 60+ · D 50+ · F 0+.

Shop reputation

  • Starts at 100. Each problem we can source costs points: critical 35, major 20, minor 7.
  • "Not reviewed yet" until we've checked, and then it doesn't count toward the overall grade.
  • Customer reviews inform this score only; they never change a lab result.

What the lab grade means. A: Vials were the right peptide, very pure and close to the labelled dose. C: Results were mixed: some measurements missed the mark. F: Results often failed: wrong peptide, low purity or far-off doses.

Where the data comes from, and what we didn't doSources, the basic check, missing data, authorship

Lab data. Results come from independent lab records, each published with its lab report. We copy the measurements, link the report, and grade them ourselves; nobody else's rating is used. The data is refreshed at most hourly.

The basic check. A vial passes if it's the right peptide, at least 99.5% pure, and within 35% of the labelled dose. A vial missing purity or dose is marked "not enough data", never a pass.

Missing data and look-alikes. Missing values are shown as "not measured" or "not checked". Shops with similar names aren't combined unless a connection is documented.

What we didn't do. Unless a vial says otherwise, we didn't buy or test it ourselves, didn't confirm reports with the labs, and didn't contact the shop.

Authorship. This page is compiled automatically from lab data and hasn't been reviewed by an editor yet. We have no affiliate relationship with Peptide Sciences and earn nothing from it.

Have evidence we should see? Lab reports with a batch number, order records or corrections can be sent through our contact page or to editorial@peptidevendorreviews.org.

The same rubric applies to every shop, and commercial relationships never change ratings, grades, rankings, or the selection of alternatives. Partner links are labelled. A grade describes the evidence on the date shown. It isn't advice to buy or avoid a shop, or a judgement on whether any peptide is safe or right for you. Rubric grading-v2 (2026-10-24).

Elsewhere

Where Peptide Sciences is discussed

Customer reviews and forum threads are kept off this page. These links open the conversations people search for.

FAQ

Peptide Sciences reviews: common questions

Is Peptide Sciences legit?

The reviewed evidence receives grade F under our published rubric. Independent labs have tested 126 of its vials across 10 peptides; 111 were the right peptide and 78 passed our basic check. Failed: Tesamorelin 10 mg (batch PS6HRP22) (failed: it wasn't the peptide on the label); CJC-1295 5 mg (batch PS6HRI22) (failed: it wasn't the peptide on the label); Tesamorelin 10 mg (failed: it wasn't the peptide on the label); Retatrutide 12 mg (batch PS6HRP22) (failed: it wasn't the peptide on the label); Retatrutide 20 mg (failed: it wasn't the peptide on the label); Retatrutide 12 mg (batch 01.01.2025) (failed: it wasn't the peptide on the label); Tirzepatide 30 mg (batch 01/14/2026) (failed: purity was 99.4%, below 99.5%); Tesamorelin 10 mg (failed: purity was 99%, below 99.5%; the dose was +49% from the label, beyond the 35% limit); Tirzepatide 10 mg (failed: the dose was +114% from the label, beyond the 35% limit); CJC-1295 10 mg (failed: the dose was -53% from the label, beyond the 35% limit); BPC-157 10 mg (failed: purity was 99.26%, below 99.5%); Tesamorelin 2 mg (batch VI182025-718-2) (failed: purity was 98.9%, below 99.5%); Retatrutide 12 mg (failed: purity was 99.285%, below 99.5%); Retatrutide 6 mg (batch VI9920250415-6) (failed: purity was 99.306%, below 99.5%); CJC-1295 5 mg (batch MOD320241026-5) (failed: purity was 98.694%, below 99.5%); Retatrutide 6 mg (batch VI9920250415-6) (failed: purity was 99.467%, below 99.5%); CJC-1295 5 mg (batch CJC320250118-5) (failed: purity was 99.133%, below 99.5%); Ipamorelin 5 mg (batch IPA720250124-5) (failed: purity was 99.127%, below 99.5%); Tirzepatide 10 mg (batch TIR7920250124-10) (failed: purity was 98.73%, below 99.5%); Retatrutide 6 mg (batch RET7920231109-6) (failed: it wasn't the peptide on the label); CJC-1295 5 mg (batch CJC320250118-5) (failed: purity was 99.418%, below 99.5%); CJC-1295 5 mg (batch CJC320250118-5) (failed: purity was 99.479%, below 99.5%; the dose was -43.8% from the label, beyond the 35% limit); Retatrutide 12 mg (batch RET9920241222-12) (failed: purity was 98.83%, below 99.5%); Tirzepatide 10 mg (batch TIR7920250124-10) (failed: purity was 99.25%, below 99.5%); Tirzepatide 10 mg (batch TIR7920250124-10) (failed: purity was 99.24%, below 99.5%); Semaglutide 6 mg (batch VI9820241228-6) (failed: purity was 99.49%, below 99.5%); Retatrutide 6 mg (batch RET7920231109-6) (failed: it wasn't the peptide on the label); Tirzepatide 5 mg (batch TIR7920230719-5) (failed: purity was 99.182%, below 99.5%); Tirzepatide 5 mg (batch TIR7920230719-5) (failed: purity was 99.101%, below 99.5%); Retatrutide 6 mg (batch RET7920231109-6) (failed: it wasn't the peptide on the label); Retatrutide 6 mg (batch RET7920231109-6) (failed: purity was 99.045%, below 99.5%; the dose was +45.83% from the label, beyond the 35% limit); Retatrutide 6 mg (batch RET7920231109-6) (failed: purity was 99.087%, below 99.5%; the dose was +45.33% from the label, beyond the 35% limit); Retatrutide 6 mg (batch RET7920231109-6) (failed: it wasn't the peptide on the label); CJC-1295 5 mg (batch CJC320241122-5) (failed: it wasn't the peptide on the label); Retatrutide 6 mg (batch RET7920231124-6) (failed: it wasn't the peptide on the label); CJC-1295 5 mg (batch CJC320241122-5) (failed: it wasn't the peptide on the label); BPC-157 5 mg (batch VI220240603-5) (failed: purity was 99.221%, below 99.5%); Melanotan II 3 mg (batch 052462A) (failed: purity was 99.26%, below 99.5%; the dose was -47% from the label, beyond the 35% limit); Melanotan II 3 mg (batch 052462A) (failed: purity was 99.27%, below 99.5%; the dose was -45.33% from the label, beyond the 35% limit); Melanotan II 3 mg (batch 052462A) (failed: purity was 98.99%, below 99.5%; the dose was -50% from the label, beyond the 35% limit); Melanotan II 3 mg (batch 052462A) (failed: purity was 98.62%, below 99.5%; the dose was -51% from the label, beyond the 35% limit); Melanotan II 3 mg (batch 052462A) (failed: purity was 99.01%, below 99.5%; the dose was -47.33% from the label, beyond the 35% limit); Retatrutide 6 mg (batch RET7920231124-6) (failed: it wasn't the peptide on the label); Retatrutide 6 mg (batch RET7920231124-6) (failed: it wasn't the peptide on the label); Semaglutide 10 mg (batch VI9820241129-10) (failed: purity was 99.474%, below 99.5%); BPC-157 5 mg (batch VI220240603-5) (failed: purity was 99.348%, below 99.5%); BPC-157 5 mg (batch VI220240603-5) (failed: purity was 99.471%, below 99.5%); Retatrutide 6 mg (batch RET7920231124-6) (failed: purity was 99.477%, below 99.5%). We grade lab evidence and published facts; grades are not endorsements and do not determine whether a business acts lawfully.

Visit Peptide Partners, graded A

What do Peptide Sciences' lab results show?

126 vials tested between Dec 17, 2024 and Jul 20, 2026: Retatrutide (37), Tirzepatide (17), Semaglutide (15), BPC-157 (13), Melanotan II (10), CJC-1295 (9), Ipamorelin (9), GHK-Cu (6), PT-141 (6) and Tesamorelin (4). 111 of 126 were the right peptide, purity was measured on 111, and 23 of 111 were within 5% of the labelled dose. 48 failed our basic check (right peptide, at least 99.5% pure, within 35% of the labelled dose).

Who sent Peptide Sciences' vials for testing?

bought by the independent tester (90) and sent in anonymously (36). Chromate (27), TrustPointe (26), Krause Analytical (24), MZ Biolabs (18), Janoshik (17), BTLabs (13) and Freedom Diagnostics (1) ran the tests. 90 were bought by the tester like a normal customer.

Is Peptide Sciences still open?

Peptide Sciences says it voluntarily discontinued all research-use-only product sales in March 2026, and that it has not authorized any third party, replacement website or successor to sell on its behalf. (Notice on peptidesciences.com, checked Oct 27, 2026.)

Visit Peptide Partners, graded A

Does Peptide Sciences have a discount code?

We haven't verified a discount code for Peptide Sciences. We only list codes we have seen on the shop's site or confirmed at checkout.

External vendor records

The records include Peptide Partners, with sample grade A. Links are not endorsements.

Visit shop

Sources

Sources, updates and corrections

  1. Independent lab test records, one linked per vial in the test list · Test data: Finnrick Analytics · read Nov 11, 2026

For this shop

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