Four pumps once a day; the seller sells each bottle as a 30-day supply. Two bottles are 60 days, three are 90, six are 180.
The guarantee is 60 days from receipt. So a two-bottle pack is used up right as the window closes, a three-bottle pack has a bottle left when it closes, and a six-bottle pack has four. That is worth knowing before choosing.
Bottles times 30 days. The guarantee window is 60 days from receipt.
Decide by the end of the second bottle whatever pack you buy — that is the window the guarantee actually gives you.
Disclosure: this shop guide is independent and may receive a commission on orders placed via its links. BreathiZen is a dietary supplement, and the FDA has not evaluated these statements.

Six bottles at $49 each instead of $179, free US shipping, bonus guides, 60-day money-back guarantee.
Add the 6-pack