Quick answer: Although Peptide Sciences closed in March 2026, the research peptides it offered are still available from other vendors, including Peptide Hackers, which provides a similar catalog and documentation.
If you had experience with Peptide Sciences, you were probably buying the same handful of research peptides again and again. Those compounds did not disappear when the company closed in March 2026. Only the vendor did. So this is a simple map of what Peptide Sciences was known for and where you can source each one now.
Every compound below is carried by Peptide Hackers with the documentation Peptide Sciences customers came to expect, and then some. New customers can browse the full product line directly.
The compounds Peptide Sciences was known for
These were the staples of the Peptide Sciences catalog, and they are all available now.
- For tissue repair research, related products such as BPC-157 and TB-500 are in stock.
- For metabolic research in the GLP group, products like semaglutide, tirzepatide, and retatrutide are available for sale.
- For longevity and skin research, GHK-Cu is a related product.
- For melanocortin research, PT-141 is also available for use in laboratory studies.
The full product catalog runs more than fifty six research compounds across the major classes, so if a compound is not listed above, it is very likely still on the shelf at peptidehackers.com. Human use is not intended.
What stays the same, and what gets better
The reason many researchers trusted Peptide Sciences was documentation and a deep catalog. Both carry over to the new vendor. Every product at Peptide Hackers ships with a per batch Certificate of Analysis, HPLC verified purity, and mass spectrometry confirmation, so you are not taking anyone's word for what is in the vial.
The part that gets better is accountability and transparency. Peptide Sciences was a website that closed overnight with no refund process, leaving many users searching for a new source. Peptide Hackers runs two physical storefronts, one in Los Angeles at 2029 Century Park East and one in Newport Beach at 4695 MacArthur Court, with same day in person pickup. You can see the product and get the paperwork in hand before you pay.
How to make the switch
Find the research peptide you used to order, confirm it on the product page, and check the Certificate of Analysis. If you are local, order online and pick it up the same day in Los Angeles or Newport Beach. If you are not, shipping is available.
For the full story on why Peptide Sciences closed and how the two companies compare, see our Peptide Sciences shutdown breakdown and the Peptide Sciences vs Peptide Hackers comparison. These posts cover the related website issues and product availability.
All products are for laboratory research only. Not for human or veterinary use.
Research Use Only
This article is provided for educational purposes. All peptides discussed are sold for research use only and are not intended for human consumption or therapeutic use.