Dr. Zakia Rahman

Dr. Zakia Rahman at Stanford says it can be challenging to distinguish science from hype when it comes to red light therapy devices aimed at consumers.

As for the therapy itself, there is actual real science.

It's not science fiction.

That science is based on how red light, which occupies the longer wavelengths on the visible light spectrum, stimulates energy production inside mitochondria so that cells work better.

Ramon says there's solid research to show after months of regular use, red light therapy can improve fine lines and wrinkles and promote hair growth in people with pattern hair loss.

But the results won't be dramatic.

Maria Godoy, NPR News.