Best value
20% off
New customers
20% off your first order. New customers only. First order.
Use at oathresearch.comChecked, not claimed
Oath promos, priced against Oath's own offer for September 2026
One code cuts a first order by a fifth. A second, smaller code carries no minimum and keeps working after that first order closes. Both are set here against the 15% Oath already advertises to new accounts, not just against each other.
15% off
Everyone
15% off any order. No minimum. Applies to repeat orders.
Use at oathresearch.comBoth codes were tested against Oath Research's live checkout on 21 September 2026 and applied correctly. This site is an Oath Research deal page — it is paid nothing when you use a code, and there is no commission on either of them.
- 517+ batches tested
- 20% new-customer code
- 15% code, no minimum
- Free ship over $250
Two codes clear Oath's checkout as of this writing: one built for a first order, one built to keep working after that. Neither requires an account tier or a loyalty program — just the code, typed in at checkout.
Oath Research runs two live codes at checkout. One applies only to a first order and cuts the total by a fifth. The other has no minimum spend, no first-order restriction, and applies to a fifteenth order as easily as a first, at a flat 15% off. Both figures are checked against the shop's own cart rather than assumed from a marketing page or a forum post. The more useful comparison is not one code against the other — it is either code against what Oath already advertises on its own site. Oath's own storefront banner offers new accounts 15% off. The first-order code beats that by five percentage points. The always-on code matches the banner's rate, then keeps working long after a first order closes, which the banner does not. That comparison, not the codes in isolation, is what this page is built around.
Code check log
- GRANT took 20% and GRANT15 took 15% off on a $195.00 sample cart; a made-up control code was refused.
- GRANT took 20% and GRANT15 took 15% off on a $195.00 sample cart; a made-up control code was refused.
- GRANT took 20% and GRANT15 took 15% off on a $195.00 sample cart; a made-up control code was refused.
Page updates
- A real-cart check on 21 September 2026 confirmed both discount codes still apply, cutting the order by 20% and 15%.
The testing record behind the price
A discount is only worth taking if what is underneath it is documented. Oath runs third-party testing on every batch it ships, not a sample of them, and posts results by batch number at its own site.
- 517+batches testedas of Sep. 2026
- 99.64%avg. puritytrailing 12 months
- 274 / 517 (SEP 2026)certificates publicrest require login
- $250free-shipping lineUS orders only
Every batch, not a sample
Freedom Diagnostics, an independent third-party lab, runs purity by HPLC-UV and confirms identity by LC-MS on every batch Oath ships — not a periodic sample. As of September 2026 the archive holds more than 400 certificates, 517 at last count, with an average purity of 99.64% over the trailing twelve months. Certificates are organized by batch number at oathresearch.com/lab-results. Some 274 of the 517 are searchable without creating an account (September 2026); the remaining certificates require a login to view. That is short of a fully open archive, and worth stating plainly rather than rounding up.
A refund clause with teeth
Oath's returns policy includes a specific, checkable clause: a batch that does not meet its stated specifications or purity qualifies for a refund or a replacement. That is different from a general satisfaction guarantee — it ties the certificate archive to an actual remedy rather than leaving it as a claim with no consequence attached. There is no restocking fee, and an approved refund is processed in five to seven business days. The policy does not cover opened or used product, which is ordinary for research material and stated without hedging.
Dispatch is guaranteed; transit time is not
Most orders ship on 2-day business air, typically through UPS, with real-time tracking from dispatch. Orders placed before noon MST on a business day go out the same day; anything later, or placed on a weekend or federal holiday, goes out the next business day. That commitment covers dispatch — when the package leaves Oath's facility — not carrier transit time, and the distinction is worth keeping straight rather than rounding it up to a delivery guarantee. Shipping is US-only; Oath does not ship internationally.
A phone number and a street address
Oath publishes a US phone number and a real street address — 51 West Vaughn Avenue Suite 205, Gilbert, Arizona — rather than only a contact form. Both are corroborated by independent business-directory listings, which is a lower bar than confirming someone picks up the phone, and this page does not claim that. What is confirmed: the number and address are real, published, and checkable, in contrast to storefronts that list only a web form. Oath's own contact form requires creating an account before it can be submitted; the phone number does not.
Expired Oath codes
Codes go stale, and Oath Research is no exception. The table below lists codes that no longer clear checkout, so a search does not end in a declined code.
| Code | Offer | Expired | Status |
|---|---|---|---|
| PROMO18 | 18% off sitewide | 2026-04-22 | Expired |
| OATHVIP | $40 off orders over $300 | 2026-02-11 | Expired |
| LAUNCH25 | 25% off, launch week | 2025-10-04 | Expired |
Five points, in dollars
Five percentage points sounds small because it is small, and this page is not going to describe it otherwise. On a $60 order, the gap between Oath's own 15% new-account offer and the first-order code here comes to $3.00. On a $250 order — the same line where Oath's own site waives shipping — the same five points comes to $12.50. Neither number changes the category of purchase being made. Both are the kind of gap worth claiming when claiming it costs nothing, and neither is a reason to describe this as a dramatic discount. A code that beats a shop's own advertised offer by five points is a real, checkable edge. It is not a markdown that reshapes the price of research material, and it will not be presented as one here.
Two codes, two situations, not one stacked offer
The first-order code is restricted to new customers, which is ordinary shape for an acquisition offer: it exists to win a first transaction, and Oath's own cart enforces the restriction, not this page. The always-on code carries no such gate. It applies with no minimum order size, on a first purchase or a fifteenth, at a flat 15% off. That difference in eligibility, more than the five points of headline discount between them, is what decides which code fits a given order — a returning customer has exactly one option here, and it is the smaller number. Whether the two codes can be combined with each other, or with Oath's own new-account banner, has not been tested, and neither is described as stacking with anything.
What the discount is actually applied to
Oath sells research compounds, not medicine, and this page keeps to that line without exception: no dosing, no protocol, no claim about use in a person or an animal. What either code discounts is a catalog backed by batch-level third-party testing — more than 400 certificates as of September 2026, run by an independent lab and posted by batch number at Oath's own site. A discount code is only worth using if the product underneath it is documented, and that documentation is checkable independently of anything written on this page.
What this page does, and what it does not take
This page is a promo-code tracker for Oath Research: built to surface two working codes and move the dead ones out of the way. No purchase made with either code sends this page a payment. There is no commission, no affiliate fee, and no cut taken on the discount itself — a statement about revenue, not a description of who runs the page. Codes are checked periodically against Oath's live cart, and the two above are updated the moment either one changes or stops clearing checkout. The expired list works the same way, from the other direction.
Reading this page like a finance brief, not a marketing page
Percentages are the wrong unit for deciding whether a discount is worth using; dollars are the right one, and this page uses dollars wherever the arithmetic is straightforward enough to state without qualification. A five-point edge over Oath's own new-account offer reads differently on a $45 order than on a $250 order, and both numbers are worth having in view before deciding anything. The same discipline applies to the testing figures referenced throughout this page: '517 batches' and '99.64% purity' are only useful numbers if they come with the context that makes them checkable — a trailing-twelve-month window, an archive address, a count of how much of that archive requires a login to view. Rounding any of those numbers up, or dropping the context that qualifies them, would make this page easier to skim and less accurate. The tradeoff runs the other way here: slower to read in places, and harder to misquote as a result.
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.