In orthodontic patients with pierced ears, 30% are allergic to nickel, copper and chromium ... itching of the skin or mucosa, a burning sensation, erythema (reddening), oedema (swelling through ...

If you're looking to firm skin and ward off wrinkles, there's a good chance you've encountered peptides—and copper peptides, specifically. Mostly found in face serums, copper peptides are ...