Hi everyone!

I've received some Bird's nest as a gift and after all the effusive praises for how effective it is, I'm wondering if anyone else has positive experiences with it. Apparently HongKongers take it regularly as part of their diet and its a norm for them. I'm looking at the best grades one just to get a feel for the prices (also because the one I was given is supposed to be the best grade and I find it quite good) and it seems like it varies quite a bit. Any idea why?