We're currently in beta with a DNA-based health advice service (http://withinhealth.com) and here are a few observations (this will be written about more in detail at a future date on my personal website)

- People remember health information that is specific (personalized) to them.

88% of our beta users are able to remember their genetic insights/advice 3 or more days after receiving them.

- A compelling, personalized reason can help users get over the hump of taking an action.

No one wakes up in the morning and decides they want to get some blood work done for the heck of it. We identified interesting genetic predispositions for beta testers which were enough to motivate 7% of them to get blood work done. 21% of beta testers took an some type of action based on the personalized and advice we presented.

It hardly goes against common sense to believe that personalization would facilitate retention and action but it has been fulfilling to witness firsthand.