Peptides Book reviews
Peptides Book reviews: 5 independent lab tests across 2 products, with a limited lab record.
Written by the Peptide Vendor Reviews editorial team
Is Peptides Book legit? Lab record: Limited
How we rate- 5 independent tests
- 0 of 3 lots filled to label
- Median purity 99.9%
- Its tested product graded C or better
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5 independent COAs · not paid-to-rank · 3 of 3 lots under label
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Peptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Peptides Book products we've tested
Best-graded first. Grades come from the share of each product's samples that passed purity and quantity checks. Buy links open Peptides Book's site.
- TirzepatideAGREAT
- Tests
- 3
- Passed
- 100.0%
- Tests
- 2
- Passed
- —
What the testing shows
Across 3 measured samples from Peptides Book, 3 came in more than 5% under the quantity on the label (100%). Purity across 3 readings ran from 99.9% to 99.9%, median 99.9%. Samples span Jun 2026 to Aug 2026.
- Under label
- 3/3
- Median purity
- 99.9%
- Latest sample
- Aug 2026
more than 5% short
99.9%–99.9% range
first tested Jun 2026
Our read on Peptides Book
3 of Peptides Book's 5 graded samples passed (60%), and 100% of all samples were sent in by buyers rather than by the shop.
When a sample failed, the most common reason was the lab could not confirm it was the labelled peptide (2 times).
Against the 302 shops with at least five graded tests, Peptides Book's pass rate is at or above 25% of them, and it has more tests on record than 0% of them.
When and how Peptides Book was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (3), BTLabs (2)
- Who sent the samples
- buyers 100%
- Batches covered
- 2 distinct batch numbers; 1 checked for endotoxins
Why Peptides Book's failed samples failed
The 2 most recent failed tests, with the lab's reason.
Retatrutide · Aug 9, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Jul 9, 2026
the lab could not confirm it was the labelled peptide
Lab testing results
Independent results across 2 products.
Individual lab tests
Date
8/9/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No label / Silver crimp / Yellow cap
Date
7/9/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
White label / Silver crimp / Blue cap
Date
6/26/2026
Purity
99.9%
Quantity
50 mg → 42.7 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Black cap
Date
6/26/2026
Purity
99.9%
Quantity
20 mg → 18.5 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Yellow cap
Date
6/16/2026
Purity
99.9%
Quantity
30 mg → 27.6 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Red cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideNo label / Silver crimp / Yellow cap | 8/9/2026 | — | — | BTLabs | View | |
| RetatrutideWhite label / Silver crimp / Blue cap | 7/9/2026 | — | — | BTLabs | View | |
| TirzepatideNo label / Silver crimp / Black cap | 6/26/2026 | 10.0 | 99.9% | 50 mg → 42.7 mg | Krause Analytical | View |
| TirzepatideNo label / Silver crimp / Yellow cap | 6/26/2026 | 10.0 | 99.9% | 20 mg → 18.5 mg | Krause Analytical | View |
| TirzepatideNo label / Silver crimp / Red cap | 6/16/2026 | 10.0 | 99.9% | 30 mg → 27.6 mg | Krause Analytical | View |
Which Peptides Book products tested best
Tirzepatide has the strongest record, graded A or B.
Buying from Peptides Book
If you order from Peptides Book, start with the graded products in the table: each one links straight to the shop.
We don't track Peptides Book's prices yet. Shipping, payment and refund terms are on their site.
The official store is peptidesbook.net. Check the address before you pay.
What to check before you pay
- The lot number on the vial matches the certificate
- The certificate names the lab and the test date
- Fill versus label, not purity alone
- A refund policy in writing
Track Peptides Book
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Peptides Book: common questions
Is Peptides Book legit?
We rate lab records, not businesses. Limited lab record: 5 independent tests, 0 of 3 lots filled to label, median purity 99.9%, its tested product graded C or better. Each result links to its original certificate in the table above.
What do Peptides Book reviews say?
We don't hold scored customer reviews for Peptides Book yet. The independent lab results on this page are the evidence we have.
Which Peptides Book peptides tested best?
We have graded 1 Peptides Book product. Tirzepatide graded A or B.
Is there a Peptides Book coupon code?
We don't have a verified Peptides Book coupon code. A discount changes the price, not what is in the vial.
Ordering from Peptides Book?
Limited lab record: 5 independent tests, 0 of 3 lots filled to label, median purity 99.9%, its tested product graded C or better.