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

Precision Peptide Co reviews

Precision Peptide Co review: our rating is B (86/100), from 21 independently tested vials across 5 peptides; all 21 were the labelled peptide and 15 met our pass mark. Newest test: Oct 23, 2025. Peptide Vendor Reviews publishes each of these 21 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

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

Is Precision Peptide Co legit? Evidence assessment

Evidence assessment

B

Grade B

Our rating · 86/100

In the reviewed independent records, all 21 vials were the right peptide, and 12 of 21 were within 10% of the labelled dose. These results describe the tested samples, not all products or future batches.

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See results by productHow we grade

Test results

What was actually in the vials?

B

Good · 84/100

Mostly good results, with some measurements off target.

  • All 21 vials were the right peptide.
  • 12 of 21 held within 10% of the labelled dose.
  • Purity 97.21–100% (some low).
  • 6 of 21 failed our basic check: purity under 99.5% (5), dose more than 35% off the label (1).
More on test results →

Strength of evidence

How much can you rely on these results?

B

Good · 79/100

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

  • 21 vials tested by independent labs. We like to see 10 or more.
  • 20 of 21 were bought by the tester like a normal customer; 1 of 21 was sent in anonymously by a buyer. We can't confirm who bought each anonymous vial.
  • 21 of 21 can be traced to a batch.
  • None 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

Precision Peptide Co 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.

  • BPC-157

    Mixed assessment

    last tested Oct 23, 2025

    $5.22/mg · Estimated price · as of May 7, 2025

    C
    Vials tested
    5
    Right peptide
    All
    Purity
    97.21–100%
    Labelled quantity
    4 of 5 within 10%
    Visit shopSee each vialFurthest off: +21% (batch BPC10-08)

    Higher-rated vendor

    B

    HK Peptides

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

    $0.82/mg · 84% cheaper than Precision Peptide Co

    Estimated price · as of Aug 14, 2026

    Visit shopRead review

  • GHK-Cu

    Mixed assessment

    Listed on the shop's site · last tested Jul 10, 2025

    $0.70/mg · cheapest: 50 mg vial

    C
    Vials tested
    4
    Right peptide
    All
    Purity
    99.9–99.984%
    Labelled quantity
    1 of 4 within 10%
    Visit shopSee each vialFurthest off: +23.36% (batch GHK02)

    Higher-rated vendor

    A

    Reta-Peptide

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

    $0.06/mg · 91% cheaper than Precision Peptide Co

    Estimated price · as of Jul 1, 2026

    Visit shopRead review

  • Ipamorelin

    Mixed assessment

    Listed on the shop's site · last tested May 16, 2025

    $6.00/mg · cheapest: 5 mg vial

    C
    Vials tested
    4
    Right peptide
    All
    Purity
    99.53–100%
    Labelled quantity
    3 of 4 within 10%
    Visit shopSee each vialFurthest off: +17.4% (batch Ipa-01)

    Higher-rated vendor

    A

    Reta-Peptide

    16 Ipamorelin vials tested · last Jul 20, 2026

    $0.75/mg · 87% cheaper than Precision Peptide Co

    cheapest: 10 × 10 mg pack

    Visit shopRead review

  • Melanotan II

    Mixed assessment

    Listed on the shop's site · last tested May 16, 2025

    $4.00/mg · cheapest: 10 mg vial

    C
    Vials tested
    4
    Right peptide
    All
    Purity
    99.21–99.7%
    Labelled quantity
    4 of 4 within 10%
    Visit shopSee each vial

    Higher-rated vendor

    B

    HK Peptides

    12 Melanotan II vials tested · last Jul 9, 2026

    $0.41/mg · 90% cheaper than Precision Peptide Co

    Estimated price · as of Feb 1, 2026

    Visit shopRead review

  • Semaglutide

    Mixed assessment

    last tested May 16, 2025

    $10.45/mg · Estimated price · as of May 16, 2025

    C
    Vials tested
    4
    Right peptide
    All
    Purity
    98.66–100%
    Labelled quantity
    0 of 4 within 10%
    Visit shopSee each vialFurthest off: +558% (batch SEM5-0002)

    Higher-rated vendor

    B

    Royal Peptides

    8 Semaglutide vials tested · last Jul 23, 2026

    $2.00/mg · 81% cheaper than Precision Peptide Co

    cheapest: 10 × 30 mg pack

    Visit shopRead review

  • 5-Amino-1MQ

    Never tested

    Listed on the shop's site

    $2.00/mg · cheapest: 50 mg vial

    N/A

    No lab has tested this shop's 5-Amino-1MQ, so we can't say what's in the vial.

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    Graded vendor

    B

    Retalux

    3 5-Amino-1MQ vials tested · last Jun 16, 2026

    $0.39/mg · 80% cheaper than Precision Peptide Co

    Estimated price · as of May 30, 2026

    Visit shopRead review

  • AOD-9604

    Never tested

    Listed on the shop's site

    $12.00/mg · cheapest: 5 mg vial

    N/A

    No lab has tested this shop's AOD-9604, so we can't say what's in the vial.

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    No other AOD-9604 vendor met our quality score, sample-count, and recent-testing requirements.

    Compare all AOD-9604 vendors

  • ARA-290

    Never tested

    Listed on the shop's site

    $2.81/mg · cheapest: 16 mg vial

    N/A

    No lab has tested this shop's ARA-290, so we can't say what's in the vial.

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    No other ARA-290 vendor met our quality score, sample-count, and recent-testing requirements.

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  • Cagrilintide

    Never tested

    Listed on the shop's site

    $9.90/mg · cheapest: 10 mg vial

    N/A

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

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    Graded vendor

    B

    Wuhan Wansheng Biotechnology

    14 Cagrilintide vials tested · last May 6, 2026

    $2.20/mg · 78% cheaper than Precision Peptide Co

    Estimated price · as of Mar 3, 2026

    Visit shopRead review

  • Cartalax

    Never tested

    Listed on the shop's site

    $4.00/mg · cheapest: 20 mg vial

    N/A

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

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    No other Cartalax vendor met our quality score, sample-count, and recent-testing requirements.

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  • DSIP

    Never tested

    Listed on the shop's site

    $4.00/mg · cheapest: 10 mg vial

    N/A

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

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    Graded vendor

    B

    HkRoids

    3 DSIP vials tested · last Jul 20, 2026

    Visit shopRead review

  • Epithalon

    Never tested

    Listed on the shop's site

    $9.00/mg · cheapest: 5 mg vial

    N/A

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

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    No other Epithalon vendor met our quality score, sample-count, and recent-testing requirements.

    Compare all Epithalon vendors

  • GHRP-2

    Never tested

    Listed on the shop's site

    $4.00/mg · cheapest: 5 mg vial

    N/A

    No lab has tested this shop's GHRP-2, so we can't say what's in the vial.

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    No other GHRP-2 vendor met our quality score, sample-count, and recent-testing requirements.

    Compare all GHRP-2 vendors

  • Hexarelin

    Never tested

    Listed on the shop's site

    $6.00/mg · cheapest: 5 mg vial

    N/A

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

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    No other Hexarelin vendor met our quality score, sample-count, and recent-testing requirements.

    Compare all Hexarelin vendors

  • Kisspeptin

    Never tested

    Listed on the shop's site

    $6.50/mg · cheapest: 10 mg vial

    N/A

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

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    No other Kisspeptin vendor met our quality score, sample-count, and recent-testing requirements.

    Compare all Kisspeptin vendors

  • KPV

    Never tested

    Listed on the shop's site

    $6.00/mg · cheapest: 10 mg vial

    N/A

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

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    Graded vendor

    B

    Homopeptide

    3 KPV vials tested · last Sep 4, 2026

    $0.56/mg · 91% cheaper than Precision Peptide Co

    Estimated price · as of Jul 13, 2026

    Visit shopRead review

  • Mazdutide

    Never tested

    Listed on the shop's site

    $8.33/mg · cheapest: 12 mg vial

    N/A

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

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    Graded vendor

    B

    Peptide-S

    4 Mazdutide vials tested · last Nov 25, 2025

    $1.80/mg · 78% cheaper than Precision Peptide Co

    Estimated price · as of Nov 25, 2025

    Visit shopRead review

  • MOTS-c

    Never tested

    Listed on the shop's site

    $2.25/mg · cheapest: 40 mg vial

    N/A

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

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    Graded vendor

    B

    Reta-Peptide

    9 MOTS-c vials tested · last Oct 12, 2026

    $0.65/mg · 71% cheaper than Precision Peptide Co

    cheapest: 10 × 10 mg pack

    Visit shopRead review

  • Pinealon

    Never tested

    Listed on the shop's site

    $6.50/mg · cheapest: 10 mg vial

    N/A

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

    Visit shop

    No other Pinealon vendor met our quality score, sample-count, and recent-testing requirements.

    Compare all Pinealon vendors

  • PT-141

    Never tested

    Listed on the shop's site

    $5.60/mg · cheapest: 10 mg vial

    N/A

    No lab has tested this shop's PT-141, so we can't say what's in the vial.

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    Graded vendor

    B

    Qing Li Peptide

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

    Visit shopRead review

  • Semax

    Never tested

    Listed on the shop's site

    $3.00/mg · cheapest: 10 mg vial

    N/A

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

    Visit shop

    No other Semax vendor met our quality score, sample-count, and recent-testing requirements.

    Compare all Semax vendors

  • SS-31

    Never tested

    Listed on the shop's site

    $6.50/mg · cheapest: 10 mg vial

    N/A

    No lab has tested this shop's SS-31, so we can't say what's in the vial.

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    Graded vendor

    B

    LiliPeptide

    3 SS-31 vials tested · last Jul 17, 2026

    $1.15/mg · 82% cheaper than Precision Peptide Co

    Estimated price · as of Jun 24, 2026

    Read review

  • TB-500

    Never tested

    Listed on the shop's site

    $5.50/mg · cheapest: 10 mg vial

    N/A

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

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    Graded vendor

    B

    Peptide Partners

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

    $4.90/mg · 11% cheaper than Precision Peptide Co

    cheapest: 10 × 10 mg pack

    Visit shopRead review

  • Tesamorelin

    Never tested

    Listed on the shop's site

    $10.00/mg · cheapest: 5 mg vial

    N/A

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

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    Graded vendor

    B

    Shanghai ERP peptide Biotechnology

    13 Tesamorelin vials tested · last Oct 12, 2026

    $1.45/mg · 86% cheaper than Precision Peptide Co

    cheapest: 10 × 20 mg pack

    Visit shopRead review

  • Retatrutide

    Never tested

    $0.85/mg · Estimated price · as of Aug 19, 2026

    N/A

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

    Visit shop

    Graded vendor

    A

    Peptide Partners

    32 Retatrutide vials tested · last Oct 14, 2026

    $4.79/mg · 464% more than Precision Peptide Co

    Estimated price · as of Sep 6, 2026

    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

Precision Peptide Co reviews: key findings

From 21 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?

21 of 21 vials

Every vial was the peptide on the label

Amount matches label?

12 of 21 vials

Within 10% of the labelled amount

Peptide purity

97.21–100%

Purity across 21 tested vials

Failed our quality check

6 of 21 vials

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

Testing coverage and limitations

Vials tested for contaminants

None

No contamination checks reported

Vials with a batch number

21 of 21 vials

Tested vials linked to a production run

Bought anonymously?

20 of 21 vials

Confirmed anonymous purchases

Most recent lab test

Oct 2025

Over a year ago; results may be out of date

Test results

What the lab found

21 vials tested by 2 labs, May 6, 2025 to Oct 23, 2025. Mostly good results, with some measurements off target.

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

Precision Peptide Co website

Recorded sample grade: B. Reta-Peptide has sample grade A.

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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.
B

Good evidence

None checked for contamination and no recent tests. The evidence meets our B-band thresholds for sample count, recency and sourcing.

  • How many vials were tested21 vials. We like to see 10 or more.Good
  • Who bought them20 of 21 bought by the tester like a normal customer; 1 of 21 sent in anonymously by buyers.Good
  • Batch numbers21 of 21 vials.Good
  • How recentLatest test 383 days before our check.Poor
  • Lab reports21 of 21 link to the lab report; none confirmed with the lab yet.Good
  • Checked for contamination0 of 21 vials.Poor
  • Different labs2 labs.Good
What this review can't tell you (1)
  • 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

Precision Peptide Co 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 Precision Peptide Co 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

Precision Peptide Co vs other peptide vendors

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

BPC-157

Oct 23, 2024 – Oct 23, 2025 · 78 shops tested

Market average across all 78 shops: 40% passed, 45% within 10% of the label.

The 4 open shops with the most BPC-157 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 Precision Peptide Co 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).

FAQ

Precision Peptide Co reviews: common questions

Is Precision Peptide Co legit?

The reviewed evidence receives grade B under our published rubric. Independent labs have tested 21 of its vials across 5 peptides; 21 were the right peptide and 15 passed our basic check. Failed: BPC-157 10 mg (batch BPC10-08) (failed: purity was 97.21%, below 99.5%); Semaglutide 5 mg (batch SEM5-0002) (failed: the dose was +558% from the label, beyond the 35% limit); Melanotan II 10 mg (batch MT204) (failed: purity was 99.21%, below 99.5%); Semaglutide 5 mg (batch SEM5-0002) (failed: purity was 98.66%, below 99.5%); Semaglutide 5 mg (batch SEM5-0002) (failed: purity was 98.69%, below 99.5%); BPC-157 10 mg (batch BPC-1004) (failed: purity was 99.461%, below 99.5%). We grade lab evidence and published facts; grades are not endorsements and do not determine whether a business acts lawfully.

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What do Precision Peptide Co's lab results show?

21 vials tested between May 6, 2025 and Oct 23, 2025: BPC-157 (5), GHK-Cu (4), Ipamorelin (4), Melanotan II (4) and Semaglutide (4). 21 of 21 were the right peptide, purity was measured on 21, and 9 of 21 were within 5% of the labelled dose. 6 failed our basic check (right peptide, at least 99.5% pure, within 35% of the labelled dose).

Who sent Precision Peptide Co's vials for testing?

bought by the independent tester (20) and sent in anonymously (1). Krause Analytical (17) and Chromate (4) ran the tests. 20 were bought by the tester like a normal customer.

Precision Peptide Co website

Recorded sample grade: B. Reta-Peptide has sample grade A.

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Sources

Sources, updates and corrections

  1. Independent lab test records, one linked per vial in the test list · Test data: Finnrick Analytics · read Nov 10, 2026

For this shop

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