Will this turn my skin green?

I wore my bracelet for 3 weeks only. During that time my skin did not turn green. However, I returned my bracelet because it did not work with my arthritis in my wrist.

Can i wear it on the same wrist as i use an apple watch without compromising the functionality/effectiveness of both?

I wear it on the same wrist as my Apple Watch with no problem.

Can I take a shower with this bracelets?

Yes. I have the "men's equivalent" and I almost never take it off. Really, the only time I remove it is when I've gotten poison ivy and just needed the relief from the swelling. But, shower, bed, and swimming, yes, always on... Hope that helps.

What size do they come with?

This adjustable magnetic bracelet for women comes in a 8.0in length. It comes with a sizing tool that allows you to remove links to shorten the magnetic bracelet to fit any size wrist.