Good Science Bio is a US research-peptide vendor based in Los Angeles, California that lists 36 injectable peptides, including Tesamorelin, Thymosin Alpha-1 and Epitalon. Across 35 products with a market median, its prices sit level with the median for the same peptide and vial size; it is the cheapest vendor we track on CJC-1295 (no DAC) and Tesamorelin, and pricier on Tirzepatide and Semaglutide. We found certificates for around some of the in-stock products we track. Based on the certificates our crawler found; vendors may publish more than we index. Good Science Bio states its products are made in the USA ("Every peptide we sell is manufactured in the United States"). Shipping is $18 and free over $250; it accepts card.
Facts extracted from the vendor’s site and not yet reviewed by us.
COA coverage: Partial
We found certificates for around some of the in-stock products we track. Based on the certificates our crawler found; vendors may publish more than we index.
from 18 indexed documents
current certificates, by the date printed on them
Vanguard Laboratory signs the most of them
oldest May 27, 2026
States every batch has a lot-level Certificate of Analysis from independent third-party testing covering purity, endotoxin, and sterility.
$7/mg median
Unchanged
Median price per mg across Good Science Bio’s 36-48 priced listings, from Jul 17 ($7/mg) to Oct 13 ($7/mg) over 60 observed days. The mix of products behind the median changes as listings come and go, so this tracks the catalog as well as the prices.
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.
Below the market median on 11 of 23 comparable listings, above it on 11. Typical listing: At market price. Showing the 6 largest differences.
International
1% above
vs market median
25
peptides
Partial
in-stock products
Oct 13
International
3% above
vs market median
52
peptides
Partial
in-stock products
Oct 14
International
18% below
vs market median
52
peptides
None found
in-stock products
Oct 14
International
4% below
vs market median
46
peptides
None found
in-stock products
Oct 12
Good Science Bio sits 1% above market the tracked market median on matched peptide/size rows. The catalog in this index is smaller than Nationwide Peptides's. On COA coverage, Good Science Bio rates partial and Nationwide Peptides rates partial. Based on the certificates our crawler found; vendors may publish more than we index.
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.
Pricing data cannot settle that question, and we do not test products or verify fulfillment. Here is the evidence we do hold for Good Science Bio. We found certificates for around some of the in-stock products we track. Those certificates were signed by 1 lab, the newest tested May 27, 2026. Based on the certificates our crawler found; vendors may publish more than we index. Good Science Bio states its products are made in the USA; we have not verified that. We have been recording their prices since July 5, 2026. Read each certificate yourself, check that its lot and compound match what you are buying, and treat anything we have not recorded as unknown rather than as an answer.
We found certificates for around some of the in-stock products we track. The freshest was tested May 27, 2026. Based on the certificates our crawler found; vendors may publish more than we index. Their own testing page is at https://goodsciencebio.com/our-production. A certificate on file records what a document says; it cannot prove chain of custody or what is in the vial you receive.
Good Science Bio states that orders ship from United States. They state that they do not ship internationally. This is what the vendor says about itself, not something we have verified.
Good Science Bio lists shipping at $18. Orders over $250 are listed as shipping free. Their shipping page is at https://goodsciencebio.com/shipping-returns. Checkout is the only place these figures are binding.
At the time we recorded it, Good Science Bio listed credit or debit card. Peptide storefronts change processors often, so the options at checkout may differ from what we hold.
We have none on record for Good Science Bio. When a code we can verify appears, it shows on this page and the prices here are adjusted for it; until then, every figure on this page is the list price.
Across 35 graded products, Good Science Bio's median price per mg sits 0.5% above the median for the same peptide at the same vial size. We track 25 products from them in total. Price per mg is the comparison unit: a cheaper vial holding less is not a cheaper product.
Product documentation
Across the tracked peptide products we hold for Good Science Bio, COA coverage rates partial. The public index contains 18 documents. Reported test dates in this set run from May 27, 2026 through May 27, 2026. That rating covers the full tracked catalogue for Good Science Bio, including products that are currently out of stock, so it can differ from the in-stock rating above. Based on the certificates our crawler found; vendors may publish more than we index.
across the full tracked catalogue
current certificates, by the printed test date.
Printed date is over 18 months old.
Named on more current records than any other lab.
Certificate assessment
10 evaluated certificates
10 graded · 0 not graded · 0 in the A range.
The sample prioritizes up to ten popular peptides from this vendor. Grades assess the document and its reported tests, not the vendor’s whole catalog or the safety of a product.
Automated checks can make mistakes. Open “Why this result?” for the reason and any review notice, and check the linked COA’s lot against your product. How grading works
10 evaluated records
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: not confirmed.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548087
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: not confirmed.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548531
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: not confirmed.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548165
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: matched.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548189
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: not confirmed.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548201
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: matched.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548249
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: matched.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548315
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: matched.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548321
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: not confirmed.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548411
Document grade
X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry.
Document check: fail.
Lab record: matched.
Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2
3548423
| COA grade | Printed lab | Certificate | |||
|---|---|---|---|---|---|
| BPC-157 Lot: 3548087 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: not confirmed. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | 99.02%99.0–99.49% | View COA |
| CJC-1295 (no DAC) Lot: 3548531 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: not confirmed. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| GHK-Cu Lot: 3548165 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: not confirmed. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| Ipamorelin Lot: 3548189 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: matched. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | 99.24%99.0–99.49% | View COA |
| KPV Lot: 3548201 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: not confirmed. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| MOTS-c Lot: 3548249 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: matched. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | 99.11%99.0–99.49% | View COA |
| Selank Lot: 3548315 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: matched. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | No purity printed | View COA |
| Semax Lot: 3548321 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: matched. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | 99.14%99.0–99.49% | View COA |
| TB-500 Lot: 3548411 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: not confirmed. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | 99.41%99.0–99.49% | View COA |
| Tesamorelin Lot: 3548423 | Document grade Why this result?X2: The certificate shows no identity test, so there is no evidence the vial contains the peptide on the label. Ask the vendor for a report that confirms identity by mass spectrometry. Document check: fail. Lab record: matched. Graded Oct 14, 2026 · Grader 0.4.9 · Policy 2026-10-07.2 | Vanguard Laboratory | May 27, 2026 | 99.03%99.0–99.49% | View COA |
18 current records
3548087
3548561
3548573
3548531
3548543
3548165
3548189
3548201
3548231
3548249
3548639
3548279
3548315
3548321
3548339
3548411
3548423
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 are counts of documents in our index, and a coverage rating of what our crawler found. 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.
The Peptide App. Good Science Bio peptide prices, COA coverage and vendor facts. Updated October 13, 2026. https://www.thepeptide.app/pricing/vendor/good-science-bio
The Peptide App. (2026). Good Science Bio peptide prices, COA coverage and vendor facts. Retrieved from https://www.thepeptide.app/pricing/vendor/good-science-bio
Prices and certificate counts on this page were last refreshed October 13, 2026.
