I'd definitely buy a second domain, but for reasons different than what has been stated. health-2U.com is not a desirable domain name from the point of view of visitors for two reasons. First is the hyphen. People will forget it's there and not use it. Similarly, a number in a domain name also creates confusion since it can be 2 or two. I recommend that any new domain name you choose takes this into consideration and has no numbers of either sort, and no hyphens.

And yes, having a keyword or keyphrase in your domain name IS helpful!

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