The best thing you can do is keep is simple and easy to spell. Something like naturalspaproducts.com would be great but, unfortunately, it's taken. Oh, you should also stick with a .com because people usually type in .com and most browser are set, by default, to go to the .com domain if someone doesn't type in an extension.

You could always do something like-

yournamespaproducts.com
yourpartnersnamespaproducts.com
yourcompanyname.com

Good luck! :)


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