If you told me 10 years ago if I'd be selling 100's of thousands of pounds worth of supplements through the internet, I would have first laughed, then told you to politely f--- off!
A couple of reasons...
1. It had never crossed my mind to apply my skills to PHYSICAL products.
2. I assumed that the start up costs were well beyond my reach
3. The margins seemed to be tiny, in comparison to selling services, or selling information
4. *** MOST importantly *** I didn't believe in supplements 10 years ago!