I've heard different ideas on how to take echinacea. I read in one place that you take it for 2 weeks on and 1 week off, somewhere else I read a month on a month off. What's the best way to take it? I always forget how long I've been taking it and sometimes I even have to mark it on the calendar. I've got tonsilitice right now, dr says viral, but I've been taking echinacea lately anyway. Just wondering if there's a general school of thought on this one?