The home page summarizes the guarantee. The full terms live on a separate refund policy page.
When does the 60 days start: order, payment or delivery? Do opened bottles qualify? Must bottles be returned, and who pays shipping? How long does a refund take once approved? Are there conditions such as a limit on usage? The summary on the page does not answer these.
The answers can change what the guarantee is worth in practice.
Read it before you pay, not after. Take a screenshot with the date. Compare each answer with what the home page says, and ask support in writing if the two differ. Our guides on return shipping and on tracking your purchase date cover the practical side.