You can have websites and blogs in the supplement or weight loss niches and have no issues, as long as you don't create false testimonials, made up reviews, and things like that. When you create fake blogs and false testimonials, etc. that's when you can get into issues. I recommend giving away a bunch of your products to family, friends, and other people you might know that need the product, then ask them to review their experience on your website in the form of product reviews.