TODAY May 20, 3rd Hour: All About Peptides | Swim Safety Lesson From Olympic Gold Medal Winners | Social Media Sensation Isabel Klee on New Memoir

NBC News medical reporter Dr. Akshay Syal breaks down what to know about the popular peptide supplements. Also, in honor of National Water Safety Month, Olympic swimming legends share essential safety advice for everyone hitting the water this summer. Plus, social media creator Isabel Klee discusses her bestselling memoir, ‘Dogs, Boys, and Other Things I’ve Cried About,’ and her inspiring journey rehabilitating rescue dogs.