Google Authenticator is a free app for iOS can help protect your Google account from unauthorized access by letting you use two-step verification. The app provides automatic setup via QR code, and it can support multiple accounts. You can opt for counter-based code generation or time-based.
Please note that to use Google Authenticator you will need to enable two-step verification on your Google account. You can do so by visiting the two-step verification setup page.
You can download Google Authenticator for iOS from the iTunes store. I think it's a great idea to do use Google Authenticator, and it only takes a couple of minutes to set up. The extra security for your Google account will help bring you peace of mind so it's well worth doing.
Image credit: iTunes Preview
Additional resources for Google Authenticator for iOS
Additional resources for iOS