Originally Posted by peacheysncream

Use the sandwhich: it's a pro saying for a tactical way to give difficult council. So you start with something positive, in the middle you give the (sometimes unwanted) council and on the end you leave a compliment.

I do believe you should be assertive. If you really do not want to try the herbs then say something like:

"That is so kind of you, I know you absolutely trust what you sell, but for me, at the moment, I am truly happy with the meds I take. I feel comfortable on them, which is very important to me. However thank you so much for thinking of me and if in the future I want to try herbal remedies I certainly know where to come".

Good luck, I hope this helps.