"Recycling" vitamins/supplements

[kaethe]

I have quite a few bottles of vitamins/supplements that I don't need/won't use. Many are unopened, but some have been opened and partially used. I need to get rid of all of them. I'm not a big fan of the idea of dumping them all in the trash because that doesn't seem environmentally friendly, but what are my other options? I thought about selling at least the unopened ones, but ... A) I don't know if anyone would buy them and B) I don't know if there's any kind of law against selling them. I mean, they're not drugs in the legal sense, but I'd hate to find out the hard way that an individual selling them was illegal.

So, my question: what would you do? Try to sell them all? Try to sell the unopened ones and throw away the open ones? Throw them all away? Something else?

Thanks in advance for your advice.