Why? If echinacea really worked, they could sell it themselves right out of their offices. More $ for them.
I don't know how it is where you live but, folks around here don't buy their over-the-counter drugs at doctors' offices.
Well, first, it is fairly inexpensive and readily available from the dollar store, WalMart to any drug store.
Second, no doctors wants to let you even think a herb can help you. That might get you started thinking for yourself.
Thirdly, there's more money in 'favors' from the drug companies.
And besides that, some doctors are like a lot of people - if it doesn't cost an arm and a leg and if a doctor doesn't have control - how can it help you.