Redemption guide · about four minutes
Copy intro20, paste it into the promo field at checkout on goodlabs.com, and confirm the discount line before you pay. Six steps below, including the one on mobile that trips most people up.
Short answer
The GoodLabs promo code is
intro20
20% off your first order
Saved to clipboard, paste at checkout
Last verified
Nothing here is unusual. GoodLabs checkout works like any other cart, and the whole job is making sure the code lands in the right field and the discount actually shows up.
Use the copy button above so intro20 is on your clipboard before you reach checkout. Doing it now means one less tab-switch later.
Pick your panels or individual tests on goodlabs.com and add them to the cart. The code takes 20% off whatever’s in your first order, so there’s no minimum to hit and no reason to pad the cart.
Open the cart and continue to checkout. The promo field lives on the checkout page, not in the cart itself, so if you can’t find anywhere to enter a code, you’re probably one screen too early.
Look for a field labelled promo code, discount code, or gift card, usually next to the order summary.
On a phone, it’s often collapsed. Carts frequently hide the field behind a small toggle or a chevron next to the order summary. Tap that open first, then type. This is the single most common reason people give up and pay full price.
Paste the code and press Apply. Pressing Enter doesn’t always submit it — use the button if there is one. The order summary refreshes when the code is accepted.
Look for a discount row in the order summary and check that the total dropped by 20%. Confirm the number, not just the fact that the field turned green.
Promo availability, eligibility, and savings can vary by product, timing, and account status. GoodLabs sets the final terms.
Neither is specific to GoodLabs. Both take about five seconds and between them they account for most “the code didn’t work” reports we hear.
Habit 1
Copying from a notes app, a PDF, or a chat message can carry an invisible trailing space, and some fonts make a lowercase L and a one hard to tell apart. Retyping intro20 manually rules both out in five seconds.
Habit 2
A field that accepts a code isn’t proof the money came off. Some carts show a confirmation while applying the discount to only part of the order. The order summary is the number that matters.