[dasudasu]

I have done 1000 IU for a few months with no impact on chronic insomnia.

[shitgoose]

The recommendation is 5,000 to 10,000 iu. 1,000 is what the label on the bottle says.

[dasudasu]

According to whom? NIH says 600 IU for a normal adult (https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessiona...) and recommends a maximum daily intake of 4000 IU (https://ods.od.nih.gov/factsheets/VitaminD-Consumer/).

[SOLAR_FIELDS]

My doctor specifically prescribes 5000 IU as a maintenance dose and 15000 IU to people severely deficient. These are numbers he got from treating hundreds of deficient patients and testing his patients blood levels every 6 months. I imagine a lot less is needed if you are in the sun for a good portion of the day every day but for most of us who spend a decent amount of time inside it seems to be what’s necessary.

[shock]

My experience correlates with your doctor's: I had to take more than 5000 IUs per day for about 3 months to reach the bottom of the normal range for 25-OH-vit D.

[kpfleger]

Did you read the open letter (original link of thread)? There is an entire paragraph and footnote with 2 refs talking about the problem with the current government guidelines.

[throwaway201103]

I've been doing 4,000 iu/day of Vitamin D since March, also supplementing Zinc and C, and taking a standard multivitamin. My entire household got COVID in November and I never became symptomatic.