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I have been taking 2,000 to 4,000 IU a day for ages. My levels are maintained at something between 60 and 80 nmol/L. I pay when necessary to have my level tested with my annual physical at the EOY. I also pay for a few other tests and have consistently charted them all for the last 30 years and periodically for the 10 years before that.

You can't manage what you don't measure. It took the medical establishment a long time to recognize Vitamin D supplements as beneficial or even measuring Vitamin D levels as worthwhile. In a lot of older docs there is still resistance or worse. Medicine is an awful lot of opinioneering really and a lot of docs are not even remotely current in knowledge. Veterinary nutritionists have demonstrated and known the benefit of D3 in confined poultry for a very long time.

I know that for me Vitamin D makes a difference especially in my working years when I was in an office most of the time. Natural Vitamin D generation requires continuous exposure to natural sunlight and we don't get it between the house, car and office most days.

Touch wood, at 70 I am still seldom sick and it does not linger long when I am sick. I pray it stays that way.

I got my D level up to about 50 or 60 when I was taking extra doses during the scamdemic....

I have a cold today...not a bad one...but its really the first sickness I've had since before the official vid scam started....

I blame it on my vitamins, esp D....

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.

I have understood that there us a ratio of D K calcium and magnesium and perhaps zinc to use these supplements optimally and prevent vein calcification.

Have not found that information

Does anyone know?

I take between 10,000 - 15,000 IU per day of D3 and have been for the past 27 years. Like you, I very rarely get sick. I do believe it is a very important supplement. What most do not realize about D3 is it is more accurately described as a hormone!