I take 1000 IU of D3 daily and have for years if not decades. Believe in prevention. I’ve lived here 15 years, had a cold that lasted 5 days maybe 7 years ago.
Nice to get D from the sun, but it should be early morning sun. Cold climate here and I don’t get up early anyway. I’ll be 88 in June. In great health, weigh 116.
Wow! no cold or flu for seven years. You must be doing a lot right. Greetings to Washington state from Alabama.