hi,
I've just come back from 2 week holiday in Greece. I spent between 1-3 hours a day in the sun with factor 20 sun screen (avoiding mid-day 12pm-3pm). While taking Gynkgo Vit B complex and Vit C complex. I have noticed no improvement on the white patches, but it has only been 3 weeks of taking so i dont expect to see much so early. However i can report of no known side effects when taking Gynkgo either which is a bonus.
Now back in UK with less sun i will try to get hopefully 30min of sun exposure a day but with no sun screen unless temperature tips of 27 degrees. Fingers crossed the clouds part long enough for 30minutes.