When you check out, Seed will have you set up a monthly subscription, which means you will receive a 30-day supply every month. The benefits of a probiotic only work over continued use, so I love that my monthly refills come straight to my house just in time every month. You can always cancel if Seed isn’t the right fit for you. You'll get a reusable glass jar that you fill up with your refills each month. It also comes with a glass travel vial so you can pack it with you when traveling.