Each week, Dr. Darria answers health questions submitted by Sharecare users. Each week, Dr. Darria answers health questions submitted by Sharecare users.In this segment, Dr. Darria discusses the following: True labor contractions vs. Braxton Hicks. Can vitamin C boost fitness? How long does make-up last and does it expire? Tips for healthy on-the-go snacks. Which is better for sunscreen: sprays, lotions, sticks or creams? Submit "Ask Dr. Darria" questions on Twitter to @SharecareNow with #SharecareRadio or email questions to askdrdarria@radiomd.com.