Oath Promos
Oath Research promo code FAQ for September 2026
The questions below cover the two working codes, the expired-code list, and the shipping and returns terms they sit on top of — the same material covered in more depth elsewhere on this site, condensed into direct answers. A few things are worth stating once, here, rather than repeating in every answer: neither code has been tested for stacking with the other or with Oath's own new-account banner, so none of the answers below claim that it works; nothing on this page changes based on whether a code is used, since no code pays this page a commission; and none of the answers address dosing, protocols, or use in a person or an animal, because Oath sells research material and this page keeps to that scope throughout. What follows are the specific questions a reader is most likely to have before typing a code into a cart.
What is the actual dollar difference between the Oath promos here and Oath's own new-customer offer?
Oath's own storefront banner offers new accounts 15% off. The first-order code on this page offers 20% off, a five-percentage-point edge over what Oath already advertises. On a $60 order, five points works out to $3.00; on a $250 order, the same five points comes to $12.50. That is the honest size of the win: real, checkable, and worth taking because it costs nothing to claim, not because it reshapes the price of anything. This page will not describe five points as a dramatic discount, because it is not one — it is a small, consistent edge over a number Oath already publishes on its own site.
Can the two codes be used on the same order, or combined with Oath's own 15% offer?
That has not been tested, and neither combination is claimed to work here. Treat the two codes as separate, mutually exclusive options rather than a stack: the first-order code applies to a new account's first purchase, and the always-on code applies to any order, first or repeat, at a flat 15% off. Pick whichever one fits the order in front of you and use it on its own. If a future check confirms either combination works, that will be reflected here — until then, this page does not assert it.
Why does the first-order code get rejected on a second order?
The first-order code is restricted to new customers by design — it exists to win a first transaction, not to run on every order after. Oath's cart checks order history at the moment the code is applied and rejects it if that history shows a prior purchase. That is the code working as intended, not a targeting error or a bug. A returning customer running into this rejection should use the always-on code instead, which carries no such restriction and applies at a flat 15% off regardless of order history.
Does Oath Research ship outside the United States?
No. Oath ships within the United States only; it does not offer international shipping at all, regardless of order size or destination. Most domestic orders go out on 2-day business air, typically through UPS, with real-time tracking from the moment a package is dispatched. Orders placed before noon MST on a business day ship the same day; orders placed after that cutoff, or on a weekend or federal holiday, ship the next business day. That commitment covers dispatch, not delivery time — Oath guarantees when a package leaves, not how long the carrier takes to deliver it afterward.
What happens if a batch does not meet its stated purity?
It qualifies for a refund or a replacement under Oath's returns policy, which specifically names product that does not meet its stated specifications or purity as a covered condition. There is no restocking fee attached to an approved return, and processing takes five to seven business days once the return is approved. That clause is what ties Oath's certificate archive to an actual remedy: a purity figure on a certificate is not just a number to quote, it is a number a buyer can hold Oath to if a specific batch falls short of it.
Can the entire certificate archive at oathresearch.com/lab-results be viewed without an account?
No, and this page will not describe it that way. As of September 2026, the archive holds 517 certificates; 274 of those are searchable without creating an account, and the remaining certificates require a login to view. That is short of a fully open archive, but it is still a meaningfully larger public subset than most research-peptide vendors publish at all. The archive is organized by batch number, and the login requirement applies only to the remaining portion, not to the entire archive.
How is purity measured, and who does the testing?
Purity is measured by HPLC-UV, and identity is confirmed separately by LC-MS, on every batch Oath ships rather than on a periodic sample. The testing is run by Freedom Diagnostics, an independent third-party lab named directly on each certificate. Over the trailing twelve months, the average purity across tested batches is 99.64%, not an all-time figure. Results are posted by batch number at Oath's own certificate archive, where a specific batch can be checked against the number printed on its packaging.
Does this page earn a commission when a code is used?
No. Neither code pays this page anything — there is no commission, no affiliate link, and no fee taken on any order placed with either code. The discount amount is identical whether a code is typed in here or used anywhere else it appears. That is stated directly because pages built around a vendor's own discount code sometimes take a cut without disclosing it; this one does not take a cut, and nothing about how the codes are presented changes based on revenue, since none is tied to it.
Is Oath Peptides the same company as Oath Research?
Yes. Oath's own site currently carries a banner reading 'Oath Peptides Is Now Oath Research,' indicating a rename in progress rather than two separate businesses. As of this writing, the site's footer still reads 'Oath Peptides,' which is consistent with a company partway through updating its branding rather than evidence of two different operations. Both names refer to the same storefront, the same catalog, and the same checkout — a code that works under one name works under the other, because there is only one cart behind both.
What payment methods does Oath Research accept?
Visa, Discover, and American Express are accepted directly, along with direct bank payment, through what Oath describes as a PCI-DSS compliant payment gateway. Payment method does not change how either promo code applies — the discount is calculated on the order total before payment method is selected, and works the same way regardless of which of the accepted methods is used to complete the purchase. The card or bank account on file is charged the discounted total in a single transaction, not the pre-discount price with a separate adjustment afterward, so the number shown in the cart before submitting payment is the number that actually clears.
Does the $250 free-shipping threshold change if a promo code is applied?
That specific interaction has not been tested, and this page does not make a claim about it either way. What is confirmed is the threshold itself: Oath waives its shipping charge on US orders over $250, with no other stated condition. Whether a code changes which side of that line an order falls on — because it lowers the total, or because the threshold is calculated before any discount — is a separate question this page has not verified, and it will not guess at an answer it cannot check.
Where can I find codes that used to work but do not anymore?
The expired-codes page on this site lists codes that no longer clear Oath's checkout, checked the same way and on the same schedule as the two active codes. Nothing on that list is described as having been confirmed active at any point in the past — each entry is there because it does not work now. If a code encountered elsewhere is not producing a discount, checking it against that list is a faster way to confirm it is dead than retrying it, or a variation of it, at checkout.
How these answers are kept accurate
Every figure in the answers below traces back to Oath's own published pages — its checkout, its FAQ, its about page, and its certificate archive — checked directly rather than taken from a secondary source. Where Oath's own pages disagree with each other, such as stated support hours differing between its contact and about pages, the answer here says so rather than picking one version and presenting it as settled. Where something has not been tested, such as whether the two codes combine, the answer says that plainly instead of guessing.
What is outside this page's scope
This page does not answer questions about dosing, reconstitution, storage protocols, or using any Oath product in a person or an animal — Oath sells research material, states that scope itself, and this page does not extend past it. Questions along those lines are better directed to Oath Research directly, using the contact details on this site's own contact page, rather than answered here in any form.
Oath Research and Oath Peptides, used interchangeably
Some of the answers below refer to 'Oath Research' and others to 'Oath Peptides.' Both point to the same company, the same catalog, and the same checkout — Oath's own site is mid-rename, with a banner announcing the shift and a footer that has not yet caught up to it. A code that works under one name works under the other, because there is only one cart behind both. Where a specific answer uses one name over the other, it is usually because that is the name most directly tied to the source being cited, not because the two names refer to anything different.
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.