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Penguin Peptides

Penguin Peptides reviews

5 independent lab tests across 1 product · 99.7% average purity · 213 customer reviews · 43 products with live pricing

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4.8
213 reviews · Excellent
  • 5 HPLC samples across 1 products
  • Catalog avg purity 99.7%
  • penguinpeptides.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 5 measured samples from Penguin Peptides, 0 came in more than 5% under the quantity on the label (0%). Another 1 measured more than 5% over. Purity across 5 readings ran from 98.9% to 99.95%, median 99.9%. Samples span Oct 2025 to Jun 2026.

Under label
0/5

more than 5% short

Median purity
99.9%

98.9%–99.95% range

Latest sample
Jun 2026

first tested Oct 2025

Ships from
United States

per vendor listing

Catalog & prices

Every peptide and vial size Penguin Peptides currently sells. Prices refresh weekly.

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Showing 1–24 of 43 products

Lab testing results

Independent results across 1 product.

5
Total lab tests
99.7%
Avg purity
99.9%
Best score
98.9%
Worst score

Tested products

Individual lab tests

Tirzepatide10.0

Date

6/16/2026

Purity

99.9%

Quantity

5 mg → 4.78 mg

Lab

Krause Analytical

Vial

White label / Silver crimp / Blue cap

View certificate
Tirzepatide10.0

Date

6/1/2026

Purity

99.9%

Quantity

60 mg → 59.6 mg

Lab

Krause Analytical

Vial

White label / Copper crimp / Clear cap

View certificate
Tirzepatide9.9

Date

3/4/2026

Purity

98.9%

Quantity

5 mg → 4.96 mg

Lab

Krause Analytical

Vial

White Label / Silver Crimp / Blue Cap

View certificate
Tirzepatide10.0

Date

1/19/2026

Purity

99.95%

Quantity

5 mg → 5.09 mg

Lab

Krause Analytical

Vial

White Label / Silver Crimp / Blue Cap

View certificate
Tirzepatide10.0

Date

10/23/2025

Purity

99.95%

Quantity

50 mg → 53.6 mg

Lab

Krause Analytical

Vial

White Label / Silver Crimp / Red Cap

View certificate

Review summary

Summarised from 213 reviews

Based on 213 reviews, customers have shared their experiences with Penguin Peptides. Reviewers overwhelmingly had positive experiences with this company, praising product quality and service.

What researchers are saying

EO

Esme O.

1/14/2026

finally a vendor that respects your wallet

Been comparing prices across the usual suspects for months and Penguin keeps coming out ahead, especially once you stack the welcome code (got 15% off my first order). Flat shipping was around 12 bucks which beats the $20+ I was paying elsewhere for the same vials. Order showed up in four days, packed cold with ice packs still mostly frozen. COAs were actually on the product page, not buried behind an email request. Lyophilized powder looked clean, reconstituted fine with bac water for my research. Reordered twice already. Not flashy, just consistent and cheaper than the alternatives.

JS

Jeremy Stanley

11/27/2025

Very professional

Very professional, quick response, free shirt, discount codes, threw in a bac. water. Will use again.

ST

Steven t hughes

11/27/2025

All ways on time

All ways on time

CM

Chris Manasco

11/27/2025

Fast delivery

Fast delivery. Great customer service. Good price. Have used several times now.

JP

Jessica Pilcher

11/27/2025

Great products

Great products! One item was missing, and they quickly sent it to me!!

About Penguin Peptides

Penguin Peptides is a peptide vendor.

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Penguin Peptides customer reviews

4.8
213 total

Top mentions

  • EO

    Esme O.

    France

    Jan 14, 2026

    finally a vendor that respects your wallet

    Been comparing prices across the usual suspects for months and Penguin keeps coming out ahead, especially once you stack the welcome code (got 15% off my first order). Flat shipping was around 12 bucks which beats the $20+ I was paying elsewhere for the same vials. Order showed up in four days, packed cold with ice packs still mostly frozen. COAs were actually on the product page, not buried behind an email request. Lyophilized powder looked clean, reconstituted fine with bac water for my research. Reordered twice already. Not flashy, just consistent and cheaper than the alternatives.

  • JS

    Jeremy Stanley

    Unknown

    Nov 27, 2025

    Very professional

    Very professional, quick response, free shirt, discount codes, threw in a bac. water. Will use again.

  • ST

    Steven t hughes

    Unknown

    Nov 27, 2025

    All ways on time

    All ways on time

  • CM

    Chris Manasco

    Unknown

    Nov 27, 2025

    Fast delivery

    Fast delivery. Great customer service. Good price. Have used several times now.

  • JP

    Jessica Pilcher

    Unknown

    Nov 27, 2025

    Great products

    Great products! One item was missing, and they quickly sent it to me!!

  • CL

    Christina Lawrence

    Unknown

    Nov 27, 2025

    Great

    Shipping was super quick, packaging was well done, and when there was an issue with my address input Gary immediately recognized the issue, reached out, and resolved the problem. I just docked a star because I didnt receive my tshirt haha

  • AB

    Ashlyn Bailey

    Unknown

    Nov 27, 2025

    It's important to check the address

    Love this company I just put the wrong address on accident

  • TH

    Tim Holcomb

    Unknown

    Nov 27, 2025

    Great company

    Great company

  • SI

    Sheryl Ireson

    Unknown

    Nov 26, 2025

    Great!

    Great explanation of products. Good prices. Fast delivery.

  • R

    Robert

    Unknown

    Nov 26, 2025

    Fast shipping and Great customer service.

    Penguin peptide gets their shipments out to you fast! Great customer service!

…

Showing 1–10 of 213 reviews

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