Listen in as Dr. Mike provides the answers to a wealth of health and wellness questions. Here you'll find the answers to a wealth of health and wellness questions posed by Healthy Talk fans. Listen in because what you know helps ensure healthy choices you can live with. Today on Healthy Talk, you wanted to know:What is your opinion on optimal dosage of Vitamin C for adults?The daily recommendation of 50-100 mg of vitamin C a day could prevent diseases and deficiencies like scurvy. However, that's very low. If you want to benefit from vitamin C for brain and heart health, you may want to consider taking more. Dr. Mike's research showed the ideal dose range is 500-2,000 mg.My husband was diagnosed with melanoma a few months ago. They are going to remove it, but want to follow up with a cancer vaccine. I've done my research and am still unclear. Can you help explain this vaccine?In the same way a regular vaccine works, a cancer vaccine spikes your immune system. Once doctors have cut out the melanoma, they will give him a vaccine to try to get his immune system to respond to protect against future development and spreading of cancer cellsWhat is your take on the airport scanner; should frequent flyers be concerned?Dr. Mike isn't that concerned about them, and he frequently flies. However, you can eat cruciferous vegetables and other sulfur-based compounds to help protect your body if you're worried.If you have a health question or concern, Dr. Mike encourages you to write him at askdrmikesmith@radiomd.com or call in, toll-free, to the LIVE radio show (1.844.305.7800) so he can provide you with support and helpful advice.