I'm a believer, if you look at the PSA tests in my sig the only change between the tests in '06 & 08 and the one in '09 was I started hitting the tanning beds in the winter of '07/08 to combat a depression that was suspected to be seasonal affective disorder.
I've dropped the tanning down to 1 or 2 times/week but started taking D3 supplements. I strongly suspect with all the variants of PCa vit D is not a magic bullet, but it may help in some cases.
Dave in Durango CO
07-06 PSA 2.5
01-08 PSA 5.5 (Dr never told me)
09-09 PSA 6.5
12-09 Biopsy, initial Gleason 9 (4+5) later reduced to 8 with tertiary 5
03-01-10 Age 55 RRP in Durango CO by Dr Sejal Quale and Dr Shandra Wilson
03-16-10 Path' G-8 (4+4+5) Bilateral involving 21% of left lobe, 3% of right lobe, SVI, Focal positive margin, pT3b NO MX
All PSA as of 1-25-11 <0.04