I used to take a supplement with 10k vit D units. Made by a reputable company here in Europe. I did a blood test for vit D metabolites (oh 25 or something). It turned out I was deficient. The doc gave me 8k units as a prescription drug. In theory weaker. After 2 months I was no longer defiecient (kinda borderline). After 4 months the doc decided to go down to 4k iu. Now I wonder why some experts are telling people to…
Taking 10K per day is a bad idea. I went into the excess Vitamin D range with half that dose even in winter with an indoor job.
More is not always better.