# Oath Research promo code FAQ > Answers about the two active Oath Research promo codes, how they were tested, why one might be rejected, and whether this site earns anything from them. ## Are the Oath Research promo codes on this site still active? Yes, as of the last check on August 13, 2026. Both codes were run against Oath Research's live shopping cart that day, alongside a made-up code used as a control to confirm the cart wasn't simply accepting anything entered into the coupon field. One code applied a 20% discount, restricted to new customers on a first order; the other applied a 15% discount with no minimum and no restriction on repeat orders. If either code stops working after this date, the plan is to move it to the expired list rather than leave it listed as active. Active status here always means confirmed as of the date shown, not a permanent guarantee — codes can change on Oath's side at any time without notice to this site. ## How much do the two codes actually take off? One code takes 20% off, and is limited to new customers placing a first order with Oath. The other takes 15% off, with no minimum order size, and works whether it's a first order or a repeat one. The 20% code is the better deal in dollar terms if you qualify for it, since it beats Oath's own site-wide 15% new-account offer by five points. If you don't qualify — because you've ordered from Oath before — the 15% code is the one to use, since the higher-value code is specifically gated to new customers and will be rejected otherwise. ## Can both codes be used on the same order? There's no evidence that they can. Testing applied one code at a time to a cart and measured the resulting discount; nothing in that process checked whether a second code could be layered on top of the first, and most coupon systems, including WooCommerce carts like Oath's, are commonly configured to allow only one discount code per order. Assume only one applies, pick whichever one you actually qualify for — new customer or returning — and don't expect the two to combine into a bigger discount. If that assumption turns out to be wrong, the codes page will be updated to reflect it. ## Why did my code get rejected at checkout? The most common reason is using the new-customer code as a returning shopper — it's built to apply to a first order only, so a cart that recognizes a prior order will reject it, correctly. The second most common reason is a typo or an extra space copied along with the code. Less commonly, a code may have already been used once on an account that has a usage limit attached. If a code is rejected, first double-check it was typed cleanly, then confirm which of the two situations — new or returning customer — actually applies, and use the other code if the first one doesn't fit. ## Does this site earn a commission when I use a code? No. There is no commission, referral fee, or affiliate payment tied to either code, and no such arrangement exists between this site and Oath Research. Whether a code gets used or not, nothing here changes because of it. That's worth stating directly rather than leaving it implied, since a lot of coupon and deal pages do carry an affiliate arrangement even when they don't say so clearly. This one doesn't have one to disclose. The two codes are listed, described, and updated purely based on whether they still work at checkout — nothing about that process has a financial dimension attached to it. ## Is this Oath Research's official website? No. This is a promo code page focused on two discount codes for Oath Research, not Oath's own site. Oath's own website is where you'd go for its full product catalog, account management, and order history; this page exists to track whether specific promo codes work, show how they were checked, and keep a dated record of ones that no longer do. The testing figures and policies referenced on this site come from Oath's own published pages, cited as such rather than restated as if they originated here. ## How often are the codes rechecked? There's no fixed weekly schedule, but the codes are checked periodically rather than set once and left alone. The date shown next to each code on the homepage is the last time it was actually run against Oath's live cart, not a publish date for this page. If a considerable amount of time has passed since that date, treat it as a signal to expect a possible change rather than an assumption that nothing has moved — codes at any retailer can be adjusted or retired without public notice. ## Where do the expired codes on this site come from? The expired list is an archive of codes once associated with Oath Research that no longer apply. Unlike the two active codes, nothing on the expired list is retested or monitored — it exists so a search for an old code lands on a clear answer instead of a failed order at checkout. If a date is available for when a code stopped working, it's shown; where it isn't, the code is still listed as expired without one. None of the entries on that list carry the same confirmation the active codes do. ## Does Oath Research ship internationally? No. Oath ships within the United States only. An order placed from outside the US, or addressed to a location outside the US, won't go through regardless of whether a promo code is applied. Within the US, most orders ship on two-day business air with real-time tracking, and orders placed before noon MST on a weekday go out the same day. Orders over $250 ship free. None of these terms change based on which of the two codes, if any, is used at checkout. ## What happens if the product doesn't meet its stated purity? Oath will refund or replace it. That's the specific commitment behind its testing program: a product that doesn't meet its stated specifications or purity qualifies for a refund or replacement, with no restocking fee, typically processed within five to seven business days once approved. The same policy covers transit damage documented with photos within 48 hours, a wrong item, non-delivery despite tracking showing otherwise, and duplicate orders caught before shipment. Opened or used product isn't eligible for return, which is standard for research material rather than specific to Oath. ## Is Oath Research the same company as Oath Peptides? Yes. Oath's own site carries a banner stating "Oath Peptides Is Now Oath Research!" and the site footer still reads Oath Peptides even after the rename — both names refer to the same business. Anyone searching for an Oath Peptides promo code and landing here is looking for the same two codes described throughout this site; nothing about the discount, the testing record, or the checkout process differs based on which name a shopper knows the company by. Both brand names are used interchangeably across customer reviews and third-party listings too, not just on Oath's own site, so either search term should lead to the same place. These are the questions that come up most often about the codes on this site: whether they're still active, how the checking process actually works, why a code might get rejected at checkout, and what this site gets out of listing them in the first place. Short answer to that last one: nothing. Longer, more specific answers to everything else are below, along with a few questions about Oath Research itself — its testing record, its shipping terms, and the recent rename from Oath Peptides. This page is meant to complement the code panels and the verification log on the homepage, not repeat them; nothing here restates a code, just the reasoning and mechanics around the two that work. ## 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.