The 4-Hour Body - An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman - Timothy Ferriss
My Experience
Baseline from first blood test: 32 ng/ml
Second test on 8/20/09 (after two months of taking 1,000 IU/day and 20 minutes of sun
exposure daily): 35 ng
Third test 5 weeks later on 9/25/09 (after increasing intake to 7,200 IU/day): 59 ng/ml
I split the 7,200 IU into two doses: 1.5 droppers full of Now® liquid vitamin D3 upon
waking and again before bed. It's important to test droppers, rather than trust label claims: even
though the bottle claims 5,000 IU per dropperful, the average dropper yield was just 24 drops
and 4 drops is 400 IU, so the average full dropper therefore contained 2,400 IU--roughly half
of the label claim.
I saw the greatest impact on performance once I crossed the 50 ng/ml barrier and reached 55
ng/ml, after which the e ects plateaued. The performance enhancement of vitamin D is well
documented, at least as a result of using UV lights:
In 1944, German investigators irradiated 32 medical students, twice a week for 6 wk,
annaabi.ee 
