Contact the seller before the window closes
Use the contact details on your order confirmation, which is where your order number lives. Ask for a return authorisation. Doing this on day fifty-nine is fine; doing it on day sixty-one is not.
Sixty days from the day your card is charged, covering bottles you have already opened and been taking.

That is the whole point of the clause and it is the first thing to check on any guarantee anywhere. A policy that only accepts sealed, unopened bottles cannot be claimed by a single person who actually tried the product, which makes it decoration rather than a guarantee.
Use the contact details on your order confirmation, which is where your order number lives. Ask for a return authorisation. Doing this on day fifty-nine is fine; doing it on day sixty-one is not.
Whatever is left, empty bottles included. Use a tracked service. The journey back is at your expense, and this is the step people forget when they compare guarantees.
Back to the card that paid, once the return is received and processed. Original shipping, where it was charged, is not usually part of the refund.
Two things worth planning around. Return postage is yours, and on a six bottle order the window closes while most of the bottles are still sealed. Neither is unusual and neither is hidden here. Both are easier to know before you order than after.
It is not a promise that the product will work. It is a promise that you can get your money back if it does not, which is a different and more useful thing. No supplement can promise the first, and a page that does is telling you something about itself.
The guarantee is offered by the seller who takes the order. A bottle bought from a marketplace listing or a third-party shop was not sold by that seller, and the sixty days do not follow it. Every order button on this site opens the official checkout for exactly that reason.
The window covers the bottles you open. That is the version of this policy worth having.
