# Expired Oath Research promo codes > A dated archive of Oath Research codes that no longer apply, kept clearly separate from the two active codes so an old one isn't tried at checkout by mistake. ## Expired Oath codes The list below holds codes once associated with Oath that no longer apply. None of them work today, and none should be entered at checkout expecting a discount. | Code | Offer | Expired | Status | | --- | --- | --- | --- | | `OATH20OFF` | 20% off sitewide | 2026-03-14 | Expired | | `PEPTIDE10` | $10 off orders over $100 | 2026-02-01 | Expired | | `RESEARCH25` | 25% off first order | 2025-12-31 | Expired | | `OATHFREESHIP` | free shipping, no minimum | 2025-11-20 | Expired | | `LABDAY15` | 15% off, Labor Day | 2025-09-02 | Expired | The table below is an archive, not a recommendation. It exists because searches for Oath Research codes turn up more than the two that currently work, and a shopper who copies one of the old ones from somewhere else deserves a fast, clear answer that it won't apply, rather than a failed order at checkout. Nothing on this list is active, and nothing here should be entered expecting a discount. For codes that do work right now, see the homepage — that's the only place on this site where a code is presented as currently usable, and the only one checked against Oath's live cart. ## Why a dead-code list is useful at all Discount codes for any retailer accumulate over time. A code tied to a single campaign, a seasonal push, or a launch week typically has a hard stop, and once that date passes, the code simply stops applying — there's rarely a public announcement when it happens. The result is that old codes keep circulating in search results, forum posts, and other coupon sites long after they've stopped working, because nothing forces that kind of content to get updated once it's published. Keeping a dated list of the ones that no longer apply is a small thing on its own, but it means a search for an old Oath code lands on a clear, direct answer instead of another copy of the same dead string repeated from some other page that never checked it. None of that is specific to Oath — it's how discount codes behave for essentially any retailer running more than one promotion a year. The list below exists because the same pattern holds here too. ## How to tell an active code from an expired one The distinction on this site is simple and consistent: anything shown on the homepage has been checked against Oath's live cart and is presented with the date it was last confirmed to work. Anything in the table below is marked expired and comes with no such confirmation attached to it — it is not tested, retested, or monitored the way the two active codes are, and it never was. If a code isn't listed on the homepage, the safest assumption is that it doesn't currently work, whether or not it happens to appear somewhere in this archive. The archive's job is to record, not to vouch. Treat every entry below the same way regardless of how official any individual one might look. That's a deliberate choice, not an oversight: retesting a code that's already expired and re-confirming it still doesn't work adds nothing useful, so effort goes into keeping the two active codes current instead of maintaining a parallel testing process for codes that are already known to be dead. ## Before trying a code from somewhere else Plenty of general coupon-aggregator sites list codes for retailers like Oath without ever checking whether they still work, and some simply reprint whatever a previous page listed months or years earlier without revisiting it. A code picked up that way carries no confirmation one way or the other, no matter how confidently it's presented. The two codes on this site's homepage are the only ones checked directly against Oath's live checkout, as of the date shown there. Anything else — including every entry below — should be treated as unconfirmed at best, and outdated at worst. When a code doesn't apply, that's the far more likely explanation than a checkout error, however official the original listing might have looked. That advice cuts both ways: a code missing from this archive isn't automatically active either. The homepage, not the absence of an entry here, is the only place this site actually vouches for a code working right now. ## 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: --- This page lists two promo codes for Oath Research, checked against the live cart and dated when they were, and it earns no commission on either one. © 2026 Oath Research Promo Codes. Codes checked periodically; terms can change without notice.