★★★★★
Back a few years ago, I had been on a health kick, taking brewer's yeast as a natural source of B vitamins. I didn't think about it much until I went on a canoe trip with a group. The woman I was with, was swarmed by black flies. We counted forty bites! She was a bit peeved at me. They were completely on her, not one came near me. I am certain it was the brewer's yeast I had been taking. I literally took a handful that morning figuring it would give me extra energy for the trip. Later I read the B1 in the brewer's yeast is especially repulsive to insects. You put off a smell they don't like. I like being repulsive to them for a change!
I hope this is hopeful for those reading it. I don't know the exact doses, but I think it is wise to keep taking those brewer's yeast tablets if you know you will be outside where you are likely to be bitten. You can take them indefinitely as far as I know.
