I take a yeast culture supplelment (much different than just a yeast tablet) called EpiCor. Taken it for two years. Allergies all but gone. No cold/flu knockout punch this season or last, either. Has some solid science emerging. Works by not boosting immune system, but rather "balancing" it so it doesn't over react or under react.
Agree with all of the above as well. Sleep is crucial. Fluids and balanced diet too.
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