- Reported purity
- 99.6%99.5%+
- Test date
- Sep 21, 2025
- Laboratory named
- Peptide Works
Lot details
20250201022
Market
P
Popular
6% below market
on 19 popular peptides
Catalog
16% below market
$ price level · 87 listings
Peptides
52
19 popular carried
COA coverage, in stock
42 of 52
81% of in-stock products · in-stock vendor median 54%
Cheapest on
- Oxytocin▼ 70%
- Glutathione▼ 67%
- MK-677▼ 64%
Pricier on
- SS-31▲ 132%
- SS-31▲ 131%
- 5-Amino-1MQ▲ 67%
Price check
Listed prices at Peptide Works against the median price per mg for the same peptide at the same vial size, across every vendor we track. Vendors change prices without notice, so check the current listing before you order.
SS-3150 mg vial · lowest elsewhere $1/mg at Kalyx Labs▲ 132%$6.96/mgOxytocin2 mg vial · lowest elsewhere $10.98/mg at Swiss Chems▼ 70%$5.11/mgGlutathione200 mg vial · lowest elsewhere $0.15/mg at Umbrella Labs▼ 67%$0.11/mg5-Amino-1MQ50 mg vial · lowest elsewhere $0.68/mg at Grey Axis Research▲ 67%$3/mgMK-67710 mg vial · lowest elsewhere $14.40/mg at Nexgen Peptides▼ 64%$5.23/mgHumanin10 mg vial · lowest elsewhere $7/mg at Umbrella Labs▼ 60%$5.55/mg
Below the market median on 33 of 41 comparable listings, above it on 7. Typical listing: 24% below market. Showing the 6 largest differences.
How does Peptide Works compare to other peptide vendors?
Peptide Works
This vendorInternational
Price position
16% below
vs market median
Catalog
52
peptides
COA coverage
81%
42/52 in stock
Last checked
Sep 9
Aminologix
International
Price position
1% below
vs market median
Catalog
47
peptides
COA coverage
0%
0/47 in stock
Last checked
Aug 24
Real Peptides
International
Price position
47% above
vs market median
Catalog
46
peptides
COA coverage
83%
34/41 in stock
Last checked
Aug 31
Liberty Peptides
International
Price position
3% below
vs market median
Catalog
47
peptides
COA coverage
50%
23/46 in stock
Last checked
Sep 9
Peptide Works sits 16% below market the tracked market median on matched peptide/size rows. The catalog in this index is larger than Aminologix's. COA coverage is a document count, not a quality score.
The honest comparison unit is price per mg on matched peptide/size rows. COA coverage is presence of a current indexed document, not purity-as-quality. See the Evidence Atlas and how to read a COA.
Evidence boundary: Listed prices, stock signals, and indexed COA documents are observations. They do not establish legitimacy, authenticity, safety, sterility, chain of custody, product quality, fulfillment, or suitability. No vendor is endorsed.
Popular peptides
19 of 22 carriedFull catalog (52)
Product documentation
Peptide Works COA coverage
Current certificates are on file for 42 of 52 tracked peptide products from Peptide Works. The public index contains 43 documents. Reported test dates in this set run from Jun 22, 2022 through Sep 21, 2025. That coverage figure counts the full tracked catalogue for Peptide Works, including products that are currently out of stock, so it can differ from the in-stock figure above.
- Product coverage
- 42 of 52
- Tested in past year
- 1 of 42
- Older records
- 2
- Most named lab
- Peptide Works
81% · tracked-vendor median 54%
Based on the printed test date.
Printed date is over 18 months old.
100% of current records that name a lab.
42 current records
View COA
ARA-290Older record
- Reported purity
- 99.3%99.0–99.49%
- Test date
- Oct 15, 2023
- Laboratory named
- PEPTIDE WORKS
Lot details
20235101039
GonadorelinOlder record
- Reported purity
- 99.6%99.5%+
- Test date
- Jun 22, 2022
- Laboratory named
- Peptide Works
Lot details
2022062202
- Reported purity
- 99.52%99.5%+
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
AX20230521-SP134
- Reported purity
- 98.5%Under 99%
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot not reportedView COA
- Reported purity
- 98.5%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot not reportedView COA
- Reported purity
- 99.1%99.0–99.49%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20251007001
- Reported purity
- No purity printed
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot not reportedView COA
- Reported purity
- 98.7%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20251008011
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
202359916033
- Reported purity
- 98.7%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20250910016
- Reported purity
- No purity printed
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
ALT2500915038-SF142
- Reported purity
- 98.3%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
PB2009-LR678968
- Reported purity
- 96%Under 99%
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
A20230527-GDF8
- Reported purity
- 99.8%99.5%+
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
20230912014
- Reported purity
- 99.6%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20230911007
- Reported purity
- 99.7%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot not reportedView COA
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
23205014019
- Reported purity
- 98.07%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot not reportedView COA
- Reported purity
- 97.3%Under 99%
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
P250918033
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
20230911004
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20230910020
- Reported purity
- 99%99.0–99.49%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot not reportedView COA
- Reported purity
- 98%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
P20250922034
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
22352010123
- Reported purity
- 99.14%99.0–99.49%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20250622027
- Reported purity
- 98.87%Under 99%
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot not reportedView COA
- Reported purity
- 99.4%99.0–99.49%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
202205190225
- Reported purity
- 98.1%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot not reportedView COA
- Reported purity
- 99.8%99.5%+
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
20250924012
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
202209280014
- Reported purity
- 98.5%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20230921013
- Reported purity
- 99.3%99.0–99.49%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20250520922
- Reported purity
- 99.6%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20230591038
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
202505050375
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot not reportedView COA
- Reported purity
- 96.48%Under 99%
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
20220802/045
- Reported purity
- 99%99.0–99.49%
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
20235982046
- Reported purity
- 99.5%99.5%+
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
20200519027
- Reported purity
- 99.2%99.0–99.49%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
20251009003
- Reported purity
- 98.6%Under 99%
- Test date
- Not reported
- Laboratory named
- Peptide Works
Lot details
2010101047
- Reported purity
- 99.6%99.5%+
- Test date
- Not reported
- Laboratory named
- PEPTIDE WORKS
Lot details
26250101934
| Printed lab | Certificate | |||
|---|---|---|---|---|
| AOD-9604 | Peptide Works | Sep 21, 2025 | 99.6%99.5%+ | View COA |
| ARA-290 | PEPTIDE WORKS | Oct 15, 2023Older record | 99.3%99.0–99.49% | View COA |
| Gonadorelin | Peptide Works | Jun 22, 2022Older record | 99.6%99.5%+ | View COA |
| ACE-031 | PEPTIDE WORKS | Not reported | 99.52%99.5%+ | View COA |
| Adamax | PEPTIDE WORKS | Not reported | 98.5%Under 99% | View COA |
| Adipotide | Peptide Works | Not reported | 98.5%Under 99% | View COA |
| BPC-157 | Peptide Works | Not reported | 99.1%99.0–99.49% | View COA |
| CJC-1295 (no DAC) | PEPTIDE WORKS | Not reported | No purity printed | View COA |
| CJC-1295 (with DAC) | Peptide Works | Not reported | 98.7%Under 99% | View COA |
| DSIP | Peptide Works | Not reported | 99.5%99.5%+ | View COA |
| Epitalon | Peptide Works | Not reported | 98.7%Under 99% | View COA |
| Follistatin | Peptide Works | Not reported | No purity printed | View COA |
| FOXO4-DRI | Peptide Works | Not reported | 98.3%Under 99% | View COA |
| GDF-8 (Myostatin) | PEPTIDE WORKS | Not reported | 96%Under 99% | View COA |
| GHK-Cu | PEPTIDE WORKS | Not reported | 99.8%99.5%+ | View COA |
| GHRP-2 | Peptide Works | Not reported | 99.6%99.5%+ | View COA |
| GHRP-6 | Peptide Works | Not reported | 99.7%99.5%+ | View COA |
| Hexarelin | Peptide Works | Not reported | 99.5%99.5%+ | View COA |
| Humanin | Peptide Works | Not reported | 98.07%Under 99% | View COA |
| IGF-LR3 | PEPTIDE WORKS | Not reported | 97.3%Under 99% | View COA |
| Ipamorelin | PEPTIDE WORKS | Not reported | 99.5%99.5%+ | View COA |
| Kisspeptin-10 | Peptide Works | Not reported | 99.5%99.5%+ | View COA |
| KPV | Peptide Works | Not reported | 99%99.0–99.49% | View COA |
| LL-37 | Peptide Works | Not reported | 98%Under 99% | View COA |
| Melanotan II | Peptide Works | Not reported | 99.5%99.5%+ | View COA |
| MGF | Peptide Works | Not reported | 99.14%99.0–99.49% | View COA |
| MK-677 | PEPTIDE WORKS | Not reported | 98.87%Under 99% | View COA |
| MOTS-c | Peptide Works | Not reported | 99.4%99.0–99.49% | View COA |
| Oxytocin | Peptide Works | Not reported | 98.1%Under 99% | View COA |
| PT-141 | PEPTIDE WORKS | Not reported | 99.8%99.5%+ | View COA |
| Selank | Peptide Works | Not reported | 99.5%99.5%+ | View COA |
| Semax | Peptide Works | Not reported | 98.5%Under 99% | View COA |
| Sermorelin | Peptide Works | Not reported | 99.3%99.0–99.49% | View COA |
| SNAP-8 | Peptide Works | Not reported | 99.6%99.5%+ | View COA |
| SS-31 | PEPTIDE WORKS | Not reported | 99.5%99.5%+ | View COA |
| Tesamorelin | Peptide Works | Not reported | 99.5%99.5%+ | View COA |
| Tesofensine | PEPTIDE WORKS | Not reported | 96.48%Under 99% | View COA |
| Thymalin | PEPTIDE WORKS | Not reported | 99%99.0–99.49% | View COA |
| Thymosin Alpha-1 | PEPTIDE WORKS | Not reported | 99.5%99.5%+ | View COA |
| Thymosin Beta-4 | Peptide Works | Not reported | 99.2%99.0–99.49% | View COA |
| Triptorelin | Peptide Works | Not reported | 98.6%Under 99% | View COA |
| Vasoactive Intestinal Peptide (VIP) | PEPTIDE WORKS | Not reported | 99.6%99.5%+ | View COA |
A record appears on file after our pipeline identifies the document as a certificate of analysis and matches its printed compound to a catalog peptide. The record cannot prove authenticity, chain of custody, sterility, product safety, or suitability for use.
These numbers measure document coverage only. They do not grade vendor quality, legitimacy, or safety. Printed fields can contain transcription errors. “Older record” means the reported test date is more than 18 months old.
See the testing methodology and dataset, or compare this coverage against another vendor in the vendor comparison tool.