How do I figure out if it will sell?

Hi everyone, I recently formulated a digestive enzyme that may help people who have difficulty digesting certain foods. Unfortunately, such a business will cost me around $10K in startup costs, so I need some way to test the market to see if this product will sell before I invest so much into it... How do I do that?

via Small-Business-Forum.net http://www.small-business-forum.net/starting-your-business/9410-how-do-i-figure-out-if-will-sell.html