The copper peptide trend has gone from creams to injections — ahead of the science

Copper peptides are one of the biggest viral trends on social media. People are smearing the electric blue tincture on their face, and even injecting it under the skin. The compound is supposed to deliver flawless and firm skin, promote wound healing and other anti-aging effects. So what's the evidence behind GHK-Cu? NPR's Will Stone reports.