Vitamin D is a pretty complicated vitamin. Its fat soluble, we make it from sunlight, It is involved in bone formation and preservation but today were going to focus on its role in testosterone production. Vitamin D helps shuttle cholesterol into the testes and that’s where the cholesterol is converted to testosterone. In men with low levels of vitamin D, they frequently have low testosterone levels. More isn’t always better however, when vitamin D reaches a certain point no additional Vitamin D results in more testosterone.
In men with <50 nmol/l Vitamin D, testosterone was low, but Estradiol and LH were high. This indicates that the problem isnt at the pituitary, it is at the testes. This makes sense because the Vitamin D is a Cofactor for testosterone production in the testes. Raising the Vitamin D concentration to about 80 nmol/l resulted in a leveling out of the testosterone production. In an Austrian study administration of 3332 iu of Vitamin D was given to men with levels below 50 nmol/l. Why 3332 iu? When you find out let me know, I couldn’t come up with a more ridiculous number if I tried. The result of this administration was a doubling of the Vitamin D level in the blood. This means approx 100 nmol/l. In the other study they determined the magic number was 8o nmol/l. We can deduce that this dose of 3332 iu is more than enough to optimize testosterone production. Don’t be suprised you cant find a 3332 iu vitamin D supplement, the highest I know of is 2000 iu. If all we need is 80 nmol/L, and if taking 3332 iu gets you up to 100 nmol/L, then assuming a linear model of absorption, which is a huge assumption, then all you need is 1999.2 Iu….pretty close to the Cost Co. 2000 iu pill. God I love that place.
Confused? Don’t be. Take 2000 iu of Vitamin D per day and chances are your taking enough to get the maximum results from Vitamin D for the purpose of testosterone production. Seriously, considering the price this is the cheapest thing you can do to boost your testosterone.