Where to put your Oath discount code

Where the code box actually is

Oath's checkout, like most WooCommerce stores, shows a line near the order summary that reads something close to "Have a coupon?" or "Add discount code" — usually just above the order total, before you reach payment details. Click it, and a text field opens up.

Type the code into that field exactly, then apply it before entering payment information. The discount should show up as its own line in the order summary, subtracted from the subtotal, so you can see the exact dollar amount it removed before you commit to paying. This works the same way whether you're on a phone or a desktop browser — the field is just smaller on mobile, not different in how it behaves.

If that subtotal line doesn't change after you apply a code, it wasn't accepted — move on to the next section rather than checking out anyway and hoping it corrects itself. It won't; whatever total is showing at that point is what you'd actually be charged.

If it says the code is invalid

Three things cause most rejected codes. First, a typo or a stray space — copy-pasting is safer than retyping from memory, especially with a code that mixes letters and numbers. Second, using the wrong code for your situation: the new-customer code only works on a first Oath order, so if you've bought from Oath before, that specific code will be rejected every time, correctly, regardless of how it's typed. Third, trying to enter more than one code on the same order — checkout takes one at a time, so a second code won't stack on top of the first, and the field will usually just show whichever code was applied most recently.

If none of those explain it, the simplest fix is the other code. This page carries two, and one of them has no restriction tied to it at all beyond being an Oath order, so it's a reasonable fallback if the first one you tried doesn't go through.

Why the new-customer code won't work for you

This is the single most common reason a code gets rejected on this page, so it's worth its own section. The new-customer code is built to apply once, to a first Oath order — that's the only condition tied to it. If you've placed an order with Oath before, under any account, it won't go through, and that's the code working as intended rather than malfunctioning. There's no separate workaround, and creating a new account doesn't change anything, since eligibility is tied to having ordered before, not to a specific login.

The fix isn't complicated: use the second code instead. It has no first-order requirement and no published minimum, so it applies whether this is your first Oath order or your fifth. It's a smaller discount than the new-customer code, but it works every time, which makes it the one code most returning customers will actually use. It's worth remembering, too, that this restriction isn't unique to Oath — most first-order-only promotions across any online store work the same way, checked against order history rather than the specific code entered.

A full example, start to finish

Say it's your first Oath order, and your cart holds a GHK-Cu at $50.00 and an Ipamorelin at $55.00 — a $105.00 subtotal before anything else. At checkout, you'd find the code field near the order summary, enter the new-customer code, and apply it.

The order summary should update to show $21.00 off, bringing the subtotal to $84.00. That's the number that carries forward to shipping and payment. If your order also happens to clear $250 in product value, free shipping applies on top, as its own separate line — but $84.00 is what the code itself does to this basket, on its own, before anything else is factored in.

From there, the rest of checkout is standard: shipping address, then payment. Nothing about using a discount code changes any other step in the process — it's one field, applied once, before you move on. Worth noting: if this same $105.00 cart belonged to a returning customer instead, the everyday code would apply in the same field the same way, just for a smaller amount off — the mechanics don't change, only which code fits the situation.

One code at a time — which one to pick

If you're eligible for both codes — true for any genuinely first-time order, since the everyday code doesn't require anything beyond being an Oath customer — checkout will only accept one, so it's worth knowing which is bigger before you type anything in.

On a $150.00 order, the new-customer code brings it to $120.00. The everyday code brings the same order to $127.50. That's a $7.50 difference on this basket alone, and it scales with the size of your order — the bigger the cart, the bigger the gap between the two. So on a first order, the new-customer code is almost always the better pick.

Save the everyday code for the order after that, when the new-customer code no longer applies anyway. There's no benefit to using the smaller code on a first order just to "save" the bigger one for later — the new-customer code only works once, so using the everyday code instead on a first order is a pure loss.