I assume most people here take good multivitamins, but there seems to be some evidence that further Vitamin D supplementation is worthwhile.
Ive been supplementing with about 4000iu for a while now.
Great stuff, one of the essentials in my opinion.
A recent article from MD.
Vitamin D and Testosterone
"One more role of vitamin D has potentially been established. A group of scientists in Austria recently examined the relationship between vitamin D status and serum androgen levels in men. They assessed the levels of 25(OH)D (a circulating form of vitamin D), testosterone, and sex hormone-binding globulin (SHBG) in 2,299 men from 1997 to 2000. Researchers found that men with sufficient 25(OH)D levels (>/=30 mug/l) had significantly higher levels of total and free testosterone, and significantly lower levels of SHBG, when compared to 25(OH)D insufficient (20-29.9 mug/l) and 25(OH)D deficient (<20 mug/l) men.
The researchers also discovered something else that was interestingâ?? in a significant portion of the men studied, levels of 25(OH)D, testosterone and SHBG followed a â??seasonal pattern.â?? Levels were lowest in March and highest in August. While one study is not definitive, this one is definitely intriguing. A connection between sun exposure, vitamin D and androgen status seems to have been made. Knowing this, you may want to consider either adjusting your â??safeâ?? sun (or tanning bed) exposure and/or vitamin D supplementation.
But be carefulâ?? itâ??s important to remember not to overdo it. While vitamin D toxicity is rare, you want to make sure you donâ??t go out lying in the sun all day, and popping massive amounts of vitamin D pills. I suggest you read up on the latest vitamin D research."