Almost all of them!: Research shows that vitamins a, b complex (esp. B6, B12 ; folic acid) c, d, e ; k all enhance immune function. Bioflavonoids ; minerals like zinc are also important for immune function. Medicinal mushrooms like turkey-tails work well too i recommend the book the road to immunity by kenneth bock md for info on diet, nutrients, herbs, mind-body techniques ; other approaches to boosting immunity.
Answered 4/14/2016
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