Vitamin D seems to help everything.
Is there any harm that too much of it causes?
One study showed women with blood levels over 32 ng/ml had a 6.2% reduction in sleep quality (you would know if this happened). Another shows that triglycerides increased 13 mg/dL and total cholesterol went up by 3.6 mg/dL when normalizing overweight people with 23.5 ng/mL to 30.6 ng/mL.
Other issues start to increase beyond 40 - 50 ng/mL.
Can there be benefit to even higher amounts? Possibly, but potential negatives keep piling in, too.
My last Vitamin D was 34 ng/mL, and I aim for 30 - 40 ng/mL.
When the blood level of vitamin d is 32 ng/ml the body starts deactivating it. That’s why I believe that’s the optimal level.
I haven’t found any publication where people with a blood level of 32 ng/ml increased their levels through a supplement and received a benefit.
The highest possible blood level through sun exposure, for almost everybody, is 60 ng/ml.
There are more kidney stones in people with a blood level of 50 ng/ml.
Excess vitamin d reduces vitamin k and gamma tocopherol. It probably also reduces or increases absorption of some food components.