The domain is your "BRAND"
It should always be .com
Your brand name may not be related to your niche.
"Amazon" is the name of a land area. Or something "giant"
Bezos turned it into a "brand" that included ecommerce, product fulfillment and IT infrastructure services.
Advice - Find a GREAT PLR package related to health and re-purpose it to your specific health niche. Most of the work has already been done. Put the sales page and articles into a Wordpress install, add videos, add an Amazon store to a separate, but on the same domain, Wordpress install.
Give away an ebook to create your list and hopefully get them to click on Amazon. If they buy any product that day, you get paid. If you are using the WooZone Amazon plugin to populate the store then if they save the products they are looking at to their shopping cart, it puts a 90 day cookie on their system
Sincerely,
TheEye