Why take an herbal remedy?

Is the expectation of benefit based on tradition or science? If you take a product based on traditional use, shouldn’t the product be prepared in the traditional manner? If the product is made according to the traditional manner, the chemical profile is likely to be similar and thus benefits are more likely be similar.

Or, if you are taking a product because of the science, don’t you want to take the product upon which the science is based?

There are a lot of products on the market. What is the basis for their preparation?