Just got serum D3 today (possibly first time in my life).
After a year of targeting 100-125nmol/L (40-50ng/ml) based on research, but not taking the time to get test, myself and wife finally got it.
I used mainly Sun and Vit D Lamp, wife used mainly Vit D Lamp and supplements also.
We were roughly estimating likely blood levels achieved all along the way, based on exposure data I had on file.
What did we come in at? Well I was 109 nmol/L, and she was 113 nmol/L.