See natural options here and here
And please also refer to the unique garlic product in the right column, ALLI-C.
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Workers prepare herbal medicines at Traditional Chinese Medicine Hospital in Beijing
Chinese pharmacy workers prepare traditional Chinese medicine (TCM) packets of various herbs at the Beijing Traditional Chinese Medicine Hospital in Beijing on July 23, 2009. In order to bring TCM into full play in the prevention and treatment of Type A influenza H1N1, or swine flu, the Beijing Administration of TCM has set up a special service path for people to obtain herbal packets that doctors claim will help prevent H1N1 infection. (UPI Photo/Stephen Shaver)