What’s the difference between retinol and retinal?

In a recent article in the Independent Newspaper, Dr. Conal Perrett demystifies queries around the skincare industry’s most popular ingredients.

The article was written by Lucy Smith, Beauty writer

You can read the full article here:
https://www.independent.co.uk/extras/indybest/fashion-beauty/skincare/retinol-retinal-differences-dermatologist-b2841715.html