Yes: four rated vendors that sell Semax accept a PeptideChecked code, and Ascension Peptides' AFFILIATE50OFF saves the most, at 50% off a first order ($25 on a $50 vial). CHECKED takes 10% off at PSPeptides and Blank Peptides, and Affiliate5 takes 5% off at Licensed Peptides. Prices were checked on October 22, 2026; the codes were last verified between September 26 and October 12, 2026, and we didn't re-test them at checkout for this page.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved, not for human or animal consumption, and this page is not medical advice.
Facts checked October 22, 2026, unless another date is shown.
Semax prices and codes
Single-vial Semax prices, including any displayed sale price. "After code" is arithmetic, not a checkout quote. Vendors appear in our editors' order, which isn't sorted by score.
| Vendor | Semax vial | Price | Code | After code | Score |
|---|
| PSPeptides | 11 mg | $42.99 | CHECKED (10%) | $38.69 | 8.5 |
| Blank Peptides | 10 mg | $50.00 | CHECKED (10% off the order) | $45.00 | 7.8 |
| Ascension Peptides | 10 mg | $50.00 (was $59.99) | AFFILIATE50OFF (50%, first order) | $25.00 | 8.1 |
| Licensed Peptides | 30 mg listing | from $76.99 | Affiliate5 (5%) | from $73.14 | 7.4 |
| Peptide Plugs | 10 mg | $40 | No code we verified | - | 7.5 |
| NextGenPeps | 10 mg | $42 (was $52) | No code we verified | - | 8.8 |
| Alpha Pro Peptides | 10 mg | $34.99 (Sep 26) | No code we verified | - | 6.3 |
| American Peptides | 10 mg | $65 (Sep 26) | No code we verified | - | 9.1 |
Sources: PSPeptides, Blank Peptides (prices visible to members), Ascension, Licensed Peptides, Peptide Plugs, NextGenPeps. Alpha Pro and American Peptides prices come from our September 26, 2026 Semax vendor comparison.
By price per mg after the code, Ascension is lowest for a first order ($2.50 per mg), then PSPeptides ($3.52 per mg, because its vial is labeled 11 mg). Without a code, Peptide Plugs' single vial works out to $4.00 per mg.
Disclosure: PeptideChecked has affiliate relationships with PSPeptides, Blank Peptides, Ascension Peptides and Licensed Peptides. We may earn a commission if you buy through our links or use these codes. That doesn't change any rating, which comes only from our published method.
What each vendor offers on Semax
- Ascension Peptides: AFFILIATE50OFF is for a first order. The Semax page also lists volume pricing ($48.50 each for 3, $45 each for 10) and two certificates: Kovera Labs batch 30-05260628 (June 23, 2026) and MZ Biolabs batch 30-01260229 (February 25, 2026). Free shipping over $250. Details: Ascension Peptides coupon code.
- PSPeptides: CHECKED takes 10% off. The product page lists in-stock 11 mg vials, multi-vial discounts of 3% (2 vials), 6% (3) and 9% (4+), and links a current certificate set (batch NAD-0036038) with endotoxin, sterility, heavy metals and fentanyl reports. The page itself doesn't name the lab. Details: PSPeptides coupon code.
- Blank Peptides: CHECKED takes 10% off the entire order. Its store lists Semax 10 mg at $50 with batch B-4383620-P at 99.34% purity. On October 22, 2026, the homepage also showed its own banner, "30% off site-wide with code FALL30." That's the vendor's code, not ours, and we couldn't confirm its terms or end date. Prices show only after a free member sign-up. Details: Blank Peptides coupon code.
- Licensed Peptides: Affiliate5 takes 5% off. Its Semax 30mg listing showed prices from $76.99 (regular $85.55), and the homepage advertised a "2 for 1 sale" on any vial with no code. We couldn't confirm which option the $76.99 covers, or whether Affiliate5 stacks with the sale. Details: Licensed Peptides coupon code.
- Peptide Plugs: no code, but volume pricing runs from 5% off at 2 vials to 40% off ($24 a vial) at 10 or more. Its page shows lot 148-03-DK from Freedom Diagnostics: 99.79% purity and 12.28 mg measured against the 10 mg label.
- NextGenPeps: no code, but Semax showed a sale price ($42, down from $52), bulk pricing from 5 vials, and a 10% code for email sign-up.
How to apply a code
- Go to the vendor through our link, or type its address.
- Add Semax to your cart.
- Enter the code in the coupon or discount-code field at checkout.
- Confirm the discount line appears before you pay.
If it doesn't apply, check for a typo, another code already in the cart, a sale item the vendor excludes, or (for Ascension) a previous order. Vendors set and change their own terms. We can't apply or honor codes ourselves.
Which code fits which order
- A first order of one or two vials: AFFILIATE50OFF at Ascension gives the lowest after-code price in the table, if the code applies to the sale price.
- A repeat order: CHECKED at PSPeptides ($38.69 for 11 mg) or Blank Peptides ($45.00 for 10 mg) still applies, while Ascension's code is first-order only.
- Ten or more vials: compare a code against volume pricing. Peptide Plugs' 10-vial price ($24 a vial) is lower than any single-vial price after a code, and PSPeptides advertises 40% off kits of 10+ vials.
- Documentation first: check the lot record before the price, as covered below.
Terms we couldn't confirm
None of PSPeptides, Blank Peptides, Ascension or Licensed Peptides publishes stacking rules we could find. We couldn't confirm whether these codes apply on top of sale prices, volume pricing, Blank's FALL30 banner or Licensed Peptides' 2-for-1 offer. Treat the checkout total as the answer.
Semax regulatory status in brief
Semax isn't an FDA-approved drug. FDA's Category 2 compounding page lists it among withdrawn nominations, and in July 2026 FDA's Pharmacy Compounding Advisory Committee voted 8-5 to recommend it for the 503A bulks list. That vote is non-binding, concerns licensed pharmacies, and doesn't change how research vendors may sell it. More in what is Semax? and FDA peptide regulation in 2026.
Before you use a discount
A lower price doesn't tell you what's in the vial. Our Semax vendor comparison found Peptide Plugs documents Semax best, with a lab-searchable accession code, and that no vendor had independent Finnrick data for Semax. Match the certificate to your lot with our COA guide and COA checklist. PSPeptides' blog publishes human dosing guides, which we count against it in our review.
Comparing nootropic-class peptides? See Semax vs Selank, our best Selank vendors, and every vendor's current offer on the peptide coupon codes hub.
Try Ascension Peptides: 50% off first order with code AFFILIATE50OFFCode AFFILIATE50OFF · 8.1/10 overall
Visit Ascension Peptides
Try Blank Peptides: 10% off the entire order with code CHECKEDCode CHECKED · 7.8/10 overall
Visit Blank Peptides
Try PSPeptides: 10% off with code CHECKEDCode CHECKED · 8.5/10 overall
Visit PSPeptides
