Each user needs a separate and unique email address in order to register their kit. This is one of the many measures Vitagene takes to ensure no DNA samples or DNA files are mixed up in any way.
If you would like to use the same email address, Gmail will allow users to create an extension of a user's existing email.
With Gmail, you can use the "+" feature to create an extension, which will allow you to use the same email address to create a Vitagene account. Use the instructions in the article below to use this feature: