These alternatives clearly have the advantage of being side-effect free for most people, but I have always been very skeptical about their effectiveness. Are there actually any reliable studies on the efficacy of local honey in treating allergies? And I thought that the role of vitamin C in warding off colds had been pretty well debunked. (I assume that's what the lemons are for.)
Don't get me wrong, I really wish all this nice stuff worked. Show me firm evidence that it does, and I'm sold. (And some of it I'm happy to do even if it's not effective in the pharmacological sense, just because it feels/tastes nice.) But as I said, I'm skeptical.