Face it: You are in a commodity business. I looked at your site, then decided that if I were looking for a site like this, I would be searching for "home drug test kits". There are dozens and dozens of sites selling essentially similar products. You are not being "penalized"; you are just drowning in the crowd.

When you are selling specialty products, and your product line is somewhat unique, you can benefit greatly from the ability of search engines to lead those who are searching for your products to you.

When you are in a commodity business, you cannot *expect* this to work for you with any reliability. You *may* get lucky. When you do, rejoice and make hay. If not, you may need to actively find customers: Advertising is a time-honored tradition.