This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Below is a sample of the emails you can expect to receive when signed up to Pickvitamin.
To begin receiving the newsletter, you must first confirm your subscription by clicking on the following link: https://pickvitamin.com/newsletter/subscriber/confirm/id/18440/code/ozxaad5nju44ttih59gk038baakknu9o/