This page compares the 12 research peptide stores in our directory on the four things buyers ask about most: the discount, the lab that tests each batch, where the store ships, and when shipping is free. Every code below worked at checkout on October 12, 2026. We earn a commission if you order through our links or codes, at no extra cost to you.
A dash (—) means the store doesn’t publish that detail or we haven’t confirmed it yet. Each store’s full guide has the details behind its row.
Which peptide store has the biggest discount right now?
Arizen BioLabs, with code FALL30 for 30% off sitewide during its fall sale. HelloStacks (PEPTIDESPC, 20% off) and Drexa Labs (PEPTIDESPROM15, 15% off) come next. Peptide Confidential reaches 30% off without a code, but only on 10 or more vials.
| Store | Code | Discount | Full guide |
|---|---|---|---|
| Arizen BioLabs | FALL30 |
30% off sitewide (fall sale) | Arizen BioLabs promo code |
| HelloStacks | PEPTIDESPC |
20% off your order | HelloStacks discount code |
| Drexa Labs | PEPTIDESPROM15 |
15% off, stacks with volume pricing | Drexa Labs promo code |
| Peptide Confidential | No code needed | 10% off, up to 30% off by quantity | Peptide Confidential promo code |
| Alera Research | No code needed | Up to 12% off with bulk pricing | Alera Research promo code |
| PS Peptides | NOW10OFF |
10% off, stacks with bundle pricing | PS Peptides promo code |
| Healius Peptides | abrar10 |
10% off entire order | Healius Peptides promo code |
| American Peptides | ABRAR10 |
10% off store-wide | American Peptides promo code |
| 99 Purity Peptides | PPEPTIDESPC10 |
10% off store-wide | 99 Purity Peptides promo code |
| PepKits | peptidespromocodes-com10 |
10% off full-price items | PepKits promo code |
| Peptime | PPTXKW10 |
10% off your order | Peptime discount code |
| Synthesis Peptides | PEP2026 |
10% off your order | Synthesis Peptides coupon code |
Which peptide vendors publish third-party lab reports?
Most of them name the lab on their certificates. The ones with the broadest published panels, covering purity plus endotoxin and heavy metals, are PS Peptides, American Peptides and Synthesis Peptides. Only Synthesis Peptides had certificates from three different labs in the reports we opened.
| Store | Lab named on its certificates | What the reports cover |
|---|---|---|
| PS Peptides | North American Diagnostics | Purity, content, endotoxin, heavy metals, fentanyl screen |
| American Peptides | Bioviridian | Identity, purity, content, endotoxin, heavy metals |
| Synthesis Peptides | Freedom Diagnostics, ILS Laboratories, Kovera Labs | Purity, content, endotoxin, microbial screen, heavy metals |
| Drexa Labs | ILS Laboratories | Purity, identity, net content, fentanyl screen |
| HelloStacks | Vanguard Laboratory | Purity, assay, endotoxin |
| Arizen BioLabs | Janoshik; Freedom Diagnostics | Purity and content; identity and endotoxin on Freedom reports |
| 99 Purity Peptides | Eagle Analytical | Sterility and endotoxin |
| Alera Research | Freedom Diagnostics | HPLC-MS purity |
| Peptime | Freedom Diagnostics | — |
| Healius Peptides | Janoshik | — |
| Peptide Confidential | Third-party, lab not named | — |
| PepKits | Not named | — |
A lab report only covers the batch that was tested. Check that the lot number on your vial matches the certificate. Our guide to reading a peptide COA explains each result, and peptide testing labs covers how these labs differ.
Which peptide vendors ship outside the US?
PS Peptides, Alera Research and Peptide Confidential. PS Peptides ships to Canada, the EU, the UK and Australia. Alera Research lists the US plus 39 countries and territories, including Canada, Mexico and most of the EU. Peptide Confidential is based in Calgary and ships across Canada and to listed destinations abroad. Healius Peptides ships from both the US and the UK.
| Store | Based in | Ships to |
|---|---|---|
| PS Peptides | New Jersey, USA | US, Canada, EU, UK, Australia |
| Alera Research | USA | US plus 39 countries and territories |
| Peptide Confidential | Calgary, Canada | Canada and listed destinations abroad |
| Healius Peptides | USA (ships from the US and UK) | — |
| Arizen BioLabs | USA | US only |
| Peptime | USA | US only |
| HelloStacks | California, USA | US only |
| Synthesis Peptides | Las Vegas, Nevada, USA | US only |
| Drexa Labs | Louisiana, USA | — |
| American Peptides | Shreveport, Louisiana, USA | — |
| 99 Purity Peptides | North Charleston, South Carolina, USA | — |
| PepKits | — | — |
Which peptide store has free shipping?
HelloStacks has the lowest threshold, at $150. Alera Research and Arizen BioLabs start at $200, Drexa Labs at $249, Synthesis Peptides at $250 and American Peptides at $300. At PS Peptides, UPS Ground showed at no charge on a single $49.99 vial in our test.
| Store | Free shipping |
|---|---|
| HelloStacks | Orders over $150 |
| Alera Research | US orders over $200 |
| Arizen BioLabs | Standard shipping over $200 |
| Drexa Labs | US orders over $249, counted after the code |
| Synthesis Peptides | US orders over $250, or every order with a paid membership |
| American Peptides | Orders over $300 |
| PS Peptides | Ground was free on a $49.99 order in our test |
How we compare stores
Every store here is in our directory, and we re-check each code at checkout before we date it. Lab, shipping and payment details come from each store’s own pages and the certificates we opened, as described in each guide. We don’t accept payment for rankings, and the order of each table follows the question it answers, not who pays us more.
For the codes alone, see this month’s peptide promo codes and coupons. Our buyer’s guide covers what to check before you place an order.
For laboratory research use only. Not for human consumption, diagnostic, or therapeutic use.