My hubby, who has type 2 Diabetes, has been taking it for the last 10+ years and swears by it.
I hardly get the full blown flu.....I would get sinus infection which almost always move to my chest and I get bronchitis (at least once a year), so several years ago, I took the flu shot for two consecutive years and found that it did nothing to keep away the bronchitis, so I haven't taken it for about 5 years now. knock on wood......no bronchitis for the last two years either!!