Viking ancestry here! Well, maybe...
You need to make sure you have enough good fat/omega 3 BEFORE you start sun exposure (it has an effect on the skin and molecules within), and build up gradually. I still burn if I'm out in it too long, and burning is still bad!
Going slightly pink is the most you want to get.
A gentleman (Ted Hutchinson) on another unrelated forum sent me these links; if you want I can also put up the message he wrote for me?
In fact, going through these old messages, I've a lot to be grateful for from this chap, as it's from this starting point that I found MDA / primal / paleo sites