The holy grail of preventing sunburns... I'd like to introduce you to Heliocare. Last year my Dermatologist recommended to me these pills to prepare my skin for the summer sun. I have very fair skin and I burn very easily. So this summer I started taking them after I was out in the sun one day and got a really bad burn even with sunscreen. Taking these pills was the best thing I could have ever done because leading up to my most recent vacation in Hawaii, I only got minor burns and was fine the rest of the trip. I took these pills the month leading up to the trip and every day while I was there. If I was out in the sun for prolonged periods of time, I would take 2 pills. I am so glad I invested in these and plan on continuing to take them every year when the sun is at its strongest and I know I will be outside the most.
I should say I ALSO wore SPF 50 sunscreen while taking these pills so I do not recommend going sunscreen free. But I do recommend that if you have fair skin you start taking these. It was the best decision I have ever made.