Apparently some stainless steel can definitely leech nickel, test it with a magnet, supposedly the more magnetic it is, the less nickel is in it.

A good option is cast iron or enameled cast iron. Glass is also fine.

I remember reading that sweating is the best way (possible one of the only ways too) to remove high levels of nickel in the body.

Thanks for the heads up dawn...gotta change my cookware now though.