Gan Mao Ling, 100 ct, Plum Flower 2 Pack! Yin Chiao Chieh Tu Pien, Sugar Coated Tablets, 2x 120 tablets / Yin Qiao Jie Du PianSource Naturals Wellness Formula Capsules, 240 Count

For cold prevention, take three tablets every four hours when exposed to cold or flu, of both Gan Mao Ling and Yin Chiao.  Wellness Formula is also great, my secretary takes 5 a day and hasn’t been sick in over 5 years.  And colloidal silver is a natural antibiotic which you can take 1 teaspoon of per day, as recommended by our doctor friend who has been using it on his children for decades with good results.