My primary cause with the site is informational. But if I could bring in some (likely minimal) income, I could spend that on ads to market the site. I don't think that's immoral.
While at it, please also add the references mentioned in this thread here that this herb poses a risk to those diagnosed with MS including a big warning. This is entirely missing currently, and since you are aware of it, you are purposely misleading your audience to make a buck. Yes, that's immoral in my book.
(Part of your purported honesty would obviously be to inform your readers that ordering through your links will give you cash kickbacks.)
Not just does this bring money into your pockets, on top of that there is no evidence that withania somnifera even helps with any disease.