Best value
20% off
New customers
20% off your first order. New customers only. First order.
Use at oathresearch.comChecked against checkout
Oath Research promo codes: what works right now
One code takes 20% off a first order; a second takes 15% off any order, repeat customers included. Both are checked directly against Oath's live checkout, not copied from another coupon page.
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 13 August 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.
- Checked Aug 13, 2026
- 20% and 15% off
- 425+ batches tested
- Zero commission earned
Two Oath Research codes are active right now, each checked against the live cart instead of assumed to still work. What each one takes off, who can use it, and when it was last confirmed are listed below.
This page answers one question directly: do the Oath Research promo codes people search for still work? As of August 13, 2026, two do. One knocks 20% off a first order and is limited to new customers. The other takes 15% off any order — first, second, or fiftieth — with no minimum spend. Both were run against Oath's live checkout on that date, alongside a made-up code used as a control, which the cart correctly rejected. That control matters: it means the two working codes aren't a permissive-checkout fluke, they're genuinely accepted. Below the code panels is a short record of what was tested and when, plus a separate, clearly marked list of codes that no longer work, kept so a search for an old one doesn't end at a failed order instead of an answer.
Why the numbers on this page hold up
Oath Research publishes a certificate of analysis for every batch it ships, not a sample of them. That habit is also the reason the two codes above are worth trusting: a vendor that shows its testing work in public is one whose checkout is worth checking carefully, too. The figures below come from Oath's own published archive, not from marketing copy.
- 425+batches testedarchive, Aug 2026
- 99.63%average puritytrailing 12 months
- 250/425certificates publicrest need a login
- $0paid to this siteno commission, ever
Every batch gets its own certificate
Oath tests every batch it sells, not a spot-check sample. Purity is measured by HPLC-UV and confirmed by LC-MS for identity, and the resulting certificate names the lab that ran it: Freedom Diagnostics, an independent third party. The archive currently holds more than 400 batches — 425 as of August 2026 — and the average purity across the trailing twelve months is 99.63%. That is a rolling figure, not an all-time best-case number, which is a meaningfully harder standard to hold.
Purity is backed by the return policy
Oath's return policy ties directly to the testing above: a product that does not meet its stated specifications or purity qualifies for a refund or replacement, no restocking fee, typically processed in five to seven business days once approved. The same applies to transit damage documented with photos within 48 hours, a wrong item, non-delivery, and duplicate orders caught before they ship. Opened or used product isn't eligible — standard for research material, and stated plainly rather than buried in fine print.
Shipping has a cutoff, not a promise
Most orders ship on two-day business air, usually UPS, with real-time tracking from dispatch to delivery. Orders placed before noon MST on a weekday go out the same day; anything later, or over a weekend, ships the next business day. Orders over $250 ship free. Oath is careful to distinguish what it actually controls — dispatch — from what a carrier controls once a package leaves the building, and states its guarantee accordingly instead of promising a delivery date it can't enforce.
A phone number and a street address
Oath publishes a real US phone number and a real street address in Gilbert, Arizona, corroborated by three separate business directories — not just a contact form. That matters for a research-chemical vendor, where an anonymous storefront is the more common pattern. Its contact form does require an account before you can submit a message; the phone number doesn't. Oath also won't advise on dosing or reconstitution over the phone, which is the correct posture for a research-use supplier, not a support gap.
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 |
How the check was run
The two codes above were tested against Oath Research's live shopping cart on August 13, 2026, using a standard checkout flow with a $45 order and no account logged in. Each code was entered one at a time, the discount was read directly off the recalculated order total, and the result was recorded before moving to the next code.
The 20% code applied cleanly on a first-time checkout. The 15% code applied cleanly on the same cart with no minimum order size and no new-customer requirement attached to it. A bogus, made-up code was run through the same cart as a control and came back rejected with an invalid-coupon result — which is what should happen. It rules out the simpler explanation that the cart was just accepting anything typed into the box.
That is the whole method: a real cart, a real total, a control to catch a false positive, and a result written down at the time it happened. Nothing on this page is listed because it "should" work, or because another site listed it first.
The order in which the codes were tried also didn't matter to the result — each was applied to a fresh cart rather than stacked on the previous attempt, so the 15% result isn't an artifact of the 20% code being tried first. That kind of detail is easy to skip and easy to get wrong, which is exactly why it's written down here instead of assumed.
What the two codes actually do
The two working codes aren't interchangeable, and mixing them up is the most common reason a shopper assumes a code is broken.
The first is a new-customer offer: 20% off, built to apply to a first order only. It also beats Oath's own site-wide new-account banner, which advertises 15% off — so it's a better deal than the one already posted on Oath's own homepage, not a separate discount stacked on top of it.
The second carries no such restriction. It takes 15% off, applies with no minimum order size, and works whether it's a first order or a fifth. Anyone who has already ordered from Oath before — and would be turned away by the new-customer code — should reach for this one instead.
Only one code applies per order. Testing didn't check whether the two can be combined, and nothing here suggests they can.
In practice, that means the choice isn't really a choice: check whether Oath already has an order under your name or account, and the answer tells you which code to try first. Getting it backwards doesn't cost anything beyond a wasted click — the checkout simply won't apply the ineligible code — but knowing the distinction up front saves the extra step.
Why this page tracks dead codes too
Coupon codes for any retailer have a shelf life. Marketing pushes end, seasonal offers roll off, and a code that worked in the spring can quietly stop working by summer with no announcement anywhere. A separate section of this site tracks codes once associated with Oath that no longer apply, specifically so a search for one of those doesn't end at a rejected order during checkout.
That list isn't tested the way the two live codes above are, and it isn't meant to be read that way — it's a reference, not a log. The expired-codes page keeps it clearly separated from what's actually active, dated where a date is known.
This isn't a large list on any of the eight sites like this one, and it isn't meant to be exhaustive — coupon codes for a young brand don't accumulate the way they would for a retailer that's run promotions for a decade. It's kept anyway, because even a short list is useful the moment it saves one visitor from a failed order.
No commission, no exception
This site does not take a commission, a referral fee, or any other payment tied to either code being used, and no such arrangement exists with Oath in any form. Oath doesn't run an affiliate program that reaches this page, and nothing published here is contingent on one existing — the codes would be described exactly the same way whether or not any financial arrangement were possible.
This is a promo-code page for Oath Research: it lists the two codes, tests them against the live cart, updates the record when something changes, and earns nothing from any of it either way. That's worth stating directly rather than leaving it for a reader to wonder about.
That distinction also applies to how this page itself is written. Nothing about either code's placement, description, or prominence on this site is influenced by anything other than whether it worked when it was tested.
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.