It seems to me that there are too many variables on dosage, based on the recipient’s physiology.
Blood level seems the only way to know you are getting what you need.
I keep mine above 65.
Will it lower my PSA?
Can you keep it at that level by sun exposure?
Which lab or testing company did you use for D level ? Or did you get lab at doctors office?
Exactly, it’s the blood level that determines things. 80 is the top end, I keep m one at between 65 and 70. My partner was having memory issues and in consultation with her neurologist we put her on a Vitamin D regimen, at one point I had her level checked and she was at 114 and the doctor said lower it. but I saw some positive results from her on that regimen, even though it was high, of an improvement in mental acuity.
Anything below 25 is where problems can start health wise.
I keep mine above 65
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The highest possible level through sun exposure is 60 ng/ml.
Source:
Low Vitamin D Status despite Abundant Sun Exposure
https://academic.oup.com/jcem/article-abstract/92/6/2130/2597445