- Reported purity
- 99.02%99.0–99.49%
- Test date
- May 27, 2026
- Laboratory named
- Vanguard Laboratory
Lot details
3548087
All vendors
G
Good Science Bio peptides: prices, COAs and vendor facts
49 tracked listings · 25 productsVisit site
Good Science Bio is a US research-peptide vendor based in Los Angeles, California that lists 39 injectable peptides, including Tesamorelin, Epitalon and Thymosin Alpha-1. Across 37 products with a market median, its prices sit 1% above 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 Semaglutide and Tirzepatide. 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.
Good Science Bio at a glance
- Based in
- Los Angeles, California, USsource
- Ships from
- United Statessource
- International shipping
- Not offeredsource
- Shipping
- $18 flat · free over $250source
- Payment accepted
- Cardsource
- Returns
- Acceptedsource
- Made in USA
- Vendor states: "Every peptide we sell is manufactured in the United States"source
- Storefront
- woocommerce
- First tracked here
- July 2026
Facts extracted from the vendor’s site and not yet reviewed by us.
What the record shows
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.
- Current certificates
- 18
- Tested within a year
- 18
- Labs named
- 1
- Freshest test date
- May 27, 2026
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.
Price position
Popular
3% below market
on 18 popular peptides
Catalog
1% above market
$$ price level · 49 listings
Peptides
25
18 popular carried
COA coverage, in stock
Partial
Based on the certificates our crawler found; vendors may publish more than we index.
Cheapest on
- CJC-1295 (no DAC)▼ 49%
- Tesamorelin▼ 20%
- Epitalon▼ 17%
Pricier on
- Semaglutide▲ 65%
- Tirzepatide▲ 59%
- Tirzepatide▲ 54%
Price history
$7/mg median
Unchanged
Median price per mg across Good Science Bio’s 39-48 priced listings, from Jul 9 ($7/mg) to Oct 5 ($7/mg) over 59 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.
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.
Semaglutide20 mg vial · lowest elsewhere $1.75/mg at Peppy&Me▲ 65%$8.25/mgCagrilintide10 mg vial · lowest elsewhere $4/mg at Peptides Exchange▲ 49%$14.50/mgTirzepatide100 mg vial · lowest elsewhere $1.45/mg at Welli Labs▲ 32%$3.95/mgBPC-15715 mg vial · lowest elsewhere $3.80/mg at Pure Health Peptides▲ 20%$6/mgRetatrutide10 mg vial · lowest elsewhere $2.84/mg at Pure Compounding Labs▲ 19%$9.50/mgEpitalon50 mg vial · lowest elsewhere $0.84/mg at Luxe Research Co▼ 17%$1.80/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.
How does Good Science Bio compare to other peptide vendors?
Good Science Bio
International
Price position
1% above
vs market median
Catalog
25
peptides
COA coverage
Partial
in-stock products
Last checked
Oct 5
Pure Health Peptides
International
Price position
18% below
vs market median
Catalog
66
peptides
COA coverage
Broad
in-stock products
Last checked
Oct 5
Nationwide Peptides
International
Price position
3% above
vs market median
Catalog
52
peptides
COA coverage
Partial
in-stock products
Last checked
Oct 5
Core Peptides Direct
International
Price position
19% below
vs market median
Catalog
51
peptides
COA coverage
None found
in-stock products
Last checked
Oct 5
Good Science Bio sits 1% above market the tracked market median on matched peptide/size rows. The catalog in this index is smaller than Pure Health Peptides's. On COA coverage, Good Science Bio rates partial and Pure Health Peptides rates broad. 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.
Good Science Bio vs Pure Health PeptidesGood Science Bio vs Nationwide PeptidesGood Science Bio vs Core Peptides Direct
Popular peptides
18 of 22 carriedFull catalog (25)
Questions about Good Science Bio
Is Good Science Bio legit?
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.
Does Good Science Bio publish COAs?
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.
Where does Good Science Bio ship from?
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.
How much is shipping at Good Science Bio?
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.
What payment methods does Good Science Bio accept?
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.
Does Good Science Bio have a coupon or discount code?
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.
How do Good Science Bio prices compare to other vendors?
Across 37 graded products, Good Science Bio's median price per mg sits 1.0% 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
Good Science Bio COA coverage
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.
- Product coverage
- Partial
- Tested in past year
- 18
- Older records
- 0
- Most named lab
- Vanguard Laboratory
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.
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 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.
Cite this profile
The Peptide App. Good Science Bio peptide prices, COA coverage and vendor facts. Updated October 5, 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 5, 2026.