- Reported purity
- 99.02%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548087
Market
G
Popular
6% below market
on 18 popular peptides
Catalog
2% above market
$$ price level · 49 listings
Peptides
25
18 popular carried
COA coverage, in stock
18 of 25
72% of in-stock products · in-stock vendor median 54%
Cheapest on
- CJC-1295 (no DAC)▼ 48%
- Tesamorelin▼ 25%
- Sermorelin▼ 23%
Pricier on
- Tirzepatide▲ 94%
- Tirzepatide▲ 77%
- Tirzepatide▲ 58%
Price check
Listed prices at Good Science Bio 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.
Tirzepatide100 mg vial · lowest elsewhere $1.69/mg at Ion Peptide▲ 58%$3.95/mgSemax30 mg vial · lowest elsewhere $1.87/mg at Liberty Peptides▲ 46%$4.33/mgCagrilintide10 mg vial · lowest elsewhere $4/mg at NextGen Peptides▲ 45%$14.50/mgSemaglutide20 mg vial · lowest elsewhere $2.25/mg at Welli Labs▲ 39%$8.25/mgBPC-15715 mg vial · lowest elsewhere $3.80/mg at Pure Health Peptides▲ 20%$6/mgCJC-1295 (no DAC)5 mg vial · lowest elsewhere $5/mg at Raven's Nest▼ 14%$7/mg
Below the market median on 11 of 22 comparable listings, above it on 10. Typical listing: 3% below market. Showing the 6 largest differences.
Popular peptides
18 of 22 carriedFull catalog (25)
Product documentation
Good Science Bio COA coverage
Current certificates are on file for 18 of 25 tracked peptide products from Good Science Bio. The public index contains 18 documents. Reported test dates in this set run from May 27, 2026 through May 27, 2026. That coverage figure counts the full tracked catalogue for Good Science Bio, including products that are currently out of stock, so it can differ from the in-stock figure above.
- Product coverage
- 18 of 25
- Tested in past year
- 18 of 18
- Older records
- 0
- Most named lab
- Vanguard Laboratory
72% · 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.
18 current records
View COA
- Reported purity
- 99.07%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548561
- Reported purity
- No purity printed
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548573
- Reported purity
- No purity printed
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548531
- Reported purity
- 99%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548543
- Reported purity
- No purity printed
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548165
- Reported purity
- 99.24%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548189
- Reported purity
- No purity printed
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548201
- Reported purity
- 99.03%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548231
- Reported purity
- 99.11%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548249
- Reported purity
- 96.38%Under 99%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548639
- Reported purity
- 99%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548279
- Reported purity
- No purity printed
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548315
- Reported purity
- 99.14%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548321
- Reported purity
- 99.09%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548339
- Reported purity
- 99.41%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548411
- Reported purity
- 99.03%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548423
- Reported purity
- 99.04%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548699
| Printed lab | Certificate | |||
|---|---|---|---|---|
| BPC-157 | Vanguard Laboratory | May 27, 2026 | 99.02%99.0–99.49% | View COA |
| Cagrilintide | Vanguard Laboratory | May 27, 2026 | 99.07%99.0–99.49% | View COA |
| Cardiogen | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| CJC-1295 (no DAC) | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| CJC-1295 (with DAC) | Vanguard Laboratory | May 27, 2026 | 99%99.0–99.49% | View COA |
| GHK-Cu | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| Ipamorelin | Vanguard Laboratory | May 27, 2026 | 99.24%99.0–99.49% | View COA |
| KPV | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| Melanotan II | Vanguard Laboratory | May 27, 2026 | 99.03%99.0–99.49% | View COA |
| MOTS-c | Vanguard Laboratory | May 27, 2026 | 99.11%99.0–99.49% | View COA |
| NAD+ | Vanguard Laboratory | May 27, 2026 | 96.38%Under 99% | View COA |
| PT-141 | Vanguard Laboratory | May 27, 2026 | 99%99.0–99.49% | View COA |
| Selank | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| Semax | Vanguard Laboratory | May 27, 2026 | 99.14%99.0–99.49% | View COA |
| Sermorelin | Vanguard Laboratory | May 27, 2026 | 99.09%99.0–99.49% | View COA |
| TB-500 | Vanguard Laboratory | May 27, 2026 | 99.41%99.0–99.49% | View COA |
| Tesamorelin | Vanguard Laboratory | May 27, 2026 | 99.03%99.0–99.49% | View COA |
| Thymosin Alpha-1 | Vanguard Laboratory | May 27, 2026 | 99.04%99.0–99.49% | 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.