# Expired Oath Peptides discount codes *Expired Oath Peptides Discount Codes* > A dated list of Oath Peptides discount codes that no longer work at checkout today. The two codes that currently work are on the main codes page instead. ## Expired Oath codes These codes used to work and don't anymore — none of them apply at checkout today. They're listed here so you're not left guessing why one failed. | Code | Offer | Expired | Status | | --- | --- | --- | --- | | `OPDISCOUNT` | 15% off sitewide | 2026-04-09 | Expired | | `PEPTIDE30` | 30% off, holiday | 2025-12-26 | Expired | | `OATHLAB15` | 15% off first order | 2025-10-18 | Expired | | `RESTOCK10` | $10 off restock orders | 2025-09-07 | Expired | Codes that used to work and do not anymore. Every entry below is retired — none apply at Oath Research checkout today, so there is no reason to type them in. This list exists for one reason: if you saw one of these somewhere, in an old post, a screenshot, a forum thread, this page tells you plainly that it is dead rather than making you find out at checkout. Retired codes are not reused later under the same name, so an expiration date here is final, not a pause. If you are looking for a code that currently works, the only two live right now are covered on the main codes page: one for new customers, one for anyone, including repeat orders. Nothing on this page applies to either of those. ## Why codes expire ### Why codes expire Discount codes are not permanent. Oath runs them for a set window — a launch promotion, a seasonal push, a one-time restock offer — and then turns them off once that window closes. A code that worked in one month has no guarantee of working the next, and there is no pattern of retired codes coming back later under the same name once they are gone. This page is updated when a code stops working at checkout, not on a fixed schedule, so there can be a short gap between a code failing for the first shopper and this list catching up. If a code is not listed here and it is also not one of the two working codes on the main page, treat it as unverified rather than assuming it is still active — try it if you like, but do not expect it to apply. ## What retirement means here ### What retirement means here A code on this list does not come back. If it reappears somewhere — a forum post, a cached page, a screenshot passed around in a chat — that is old information catching up, not the code working again. The date attached to each entry is when this site last confirmed it failing at checkout, not a guess at when Oath disabled it internally, and the two dates are not always the same. Checking here first, before typing an old code into checkout, saves the round trip of finding out it fails on an order you have already built. It also means a rejected code is not automatically a sign that something is wrong with your account or your basket — more often it just means the code you tried belongs on this page and not on the working list, and it never means the working list itself is wrong. ## If a code isn't listed here ### If a code isn't listed here This list covers codes that were tried and confirmed dead at checkout — it is not a record of every code Oath has ever issued. A code that is not listed here and also is not one of the two working codes on the main page is simply unconfirmed from this site's side, not verified as active either way. The two working codes are checked directly and regularly, which is why they carry no stated expiration on the main page. Everything on this list was checked the same way, at the point it stopped applying at checkout. If a code fits neither list, the direct way to find out is to try it at checkout, rather than assume it belongs on one list or the other based on wherever it was seen. Trying it does no harm — a dead code simply does not apply, the same as leaving the discount field blank. ## Ready to use a code? Copy either code above, then paste it into the discount field at checkout. The 20% code is for first orders; the 15% code works every time. Shop Oath Research: --- Every saving shown here is basic arithmetic on Oath Research's own published prices, worked out by hand, not pulled from a live feed. © 2026 Oath Peptides Discounts. An Oath Research promo-code site.