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My wife has been a primary school teacher for 30+ years. Until last school year she has always gotten her flu shot and has brought home every flu and cold that the kids have brought to school. Last year when school started she commenced to taking 10k iu a day of D-3 and did not get any flu shot. She did not bring home any respiratory maladies though her classroom was full of it for at least a third of the school year. She repeated for this year and has brought no illnesses home so far. I take the stuff, too. I work at night and see little sun, even in the summer. I have had none of these maladies, either but then never did get them much, anyway.

I had a chronic cough that would settle in for about 6 months of every year. Nothing would cure it except time - until it came back the following year. Then one year I started taking 8000iu of D every day and it was gone in a week. The next year when I felt it coming back after a cold, I started the high dosage D again and it went away in a week. I cut back to 2000iu every day but the cough (that plagued me annually for about 15 years) has not come back.

So I don't care about their stupid studies - it worked for me.