Frequently asked questions.
How prices are compared, what we do and don’t do, and how to get the most out of PepLookup.
About PepLookup
What is PepLookup?
PepLookup is an independent price-comparison platform for research peptides. It collects publicly listed prices from suppliers and normalises them to cost per mg, so vials of different sizes and multipacks can be compared directly.
Does PepLookup sell peptides?
No. We do not manufacture, sell or ship any product. Every purchase happens directly between you and the supplier you choose, and we are not a party to that transaction.
Read the full disclaimerHow does PepLookup make money?
Some supplier links are affiliate links, so we may earn a commission when you buy through them. The commission is paid by the supplier, never changes the price you pay, and never changes how suppliers are ranked.
Prices & comparisons
What does "cost per mg" mean?
It is the price you would pay divided by the total milligrams in the pack (mg per vial multiplied by the number of vials). It is the only fair way to compare a 5 mg vial against a 10 mg vial or a three-vial kit.
Try the Price per MG calculatorHow current are the prices?
Every price carries the time it was last observed, and pages show how long ago that was. Prices older than 48 hours are clearly marked as possibly stale instead of being presented as current.
Why is the lowest price not always ranked first?
Out-of-stock listings are removed before ranking, so something you cannot actually buy never wins a "best price" comparison. Sale and list prices are also kept separate, and ranking uses the price you would pay.
Are coupon codes included in the prices shown?
Coupon codes are shown next to a supplier's listings so you can copy them, but the prices displayed are the supplier's listed prices. Always confirm the final total at checkout.
Suppliers & lab testing
What information is shown for each supplier?
Supplier profiles bring together what is available for each vendor: lab verification status, published COAs, shipping details, payment methods, coupons and policies. A listing is not an endorsement, so review a supplier's COAs and policies before ordering.
Read: choosing a research supplierWhat is a COA and why does it matter?
A Certificate of Analysis is a lab report on a specific batch, usually covering identity and purity. The most important check is that the batch number on the COA matches the batch on your vial.
Read: how to read a COACan I suggest a supplier or report incorrect data?
Yes. Send us the supplier's website or the listing you believe is wrong through the contact page and we will review it.
Contact usResearch use
Are these products intended for human use?
Products referenced on this site are represented by their suppliers as intended for laboratory research use only, not for human or animal consumption. Statements on this site have not been evaluated by the FDA.
Do the calculators give dosing advice?
No. The calculators do arithmetic on the numbers you enter, such as vial size, diluent volume and target amount. They do not recommend doses and are not medical advice.
See all toolsWatchlist & community
Do I need an account?
No. Browsing, comparing prices and every tool on the site are free and need no sign-up.
Where is my watchlist saved?
In your browser on this device. It is never sent to us, so it will not sync to another browser or device, and clearing your browser's site data removes it.
Open your watchlistIs there a community I can join?
Yes. Our Skool community is where researchers discuss protocols, compare verified suppliers and share notes.
Join the community on SkoolStill have a question?
Send us a message and we’ll get back to you, or ask other researchers in the community.
