I had heard of vitaminB tablets, I took them for about 10 days before we left for Arillas and every day there, also Boots extra strength, sprays and wipes. Plug ins and candles! Not one bite all holiday, alas, on the last night I forgot to put on the spray and didn't take out any wipes, woke up next morning with 6/7 bites on each leg, 3/4 on each arm including 2 big ones right on the elbow. So wouldn't rely on just vitamin B as i obviously still provided a tasty snack!