In January 2009, my 25(OH)D level was 8.3 ng/mL. Wowza! My doc had me supplement with a massive dose (800,000 IUs) of D2 and that got my level up to 35.3 ng/mL by May. Other than sun exposure over the summer, I did no D3 supplementation through September 2009 and my levels dipped to 24.4 ng/mL.
From September '09 to January '10, I took 10k IUs daily. This brought my level up to 115 ng/mL. At that point, I reduced my supplementation to 5k IUs daily regardless of sun exposure. I just had blood drawn this AM and will know what affect this level of supplementation will have on my 25(OH)D level.
Let me add: In previous years, I'd try to get some sun to tan, etc, but I'd burn pretty easily. This year? Not a drop of sunscreen or sunblock. I'm tanning easily and do not burn regardless of the amount of time I spend in the sun.
Edit Forgot to mention that I'm 6'1" and 240 pounds.