Lot's of great comments on my last blog concerning Vitamin D and testosterone. A few commenters rightly took me to task for my less than rigorous data regarding the association between my Vitamin D intake and my testosterone level. So, here is what we can say.
1. For my "n of one" study there is an "association" between between Vitamin D and testosterone levels. However, it cannot be concluded it is causative. It could be that can of "Coke Zero" I drink every day that's doing the trick!
2. It is not outrageous to speculate that there could be a link between Vitamin D and testosterone given chemistry. We just cannot prove it with my results. There is some excellent material on Vitamin D pharmacology put out by the Vitamin D Council (really level-headed stuff not marketing hyperbole) and for those who lean toward the "geeky" side this cite from AACC is nice.
3. It is unlikely my low testosterone stayed high several years after stopping my use of topical testosterone. What I really need to do is stop the Vitamin D for several months and re-check my testosterone to see if it goes lower. The problem is that Vitamin D is good for so many other things that it does not seem appropriate to discontinue it. Perhaps a new Track Your Plaque Virtual Clinical Trial might be useful where we measure "before" and "after" testosterone levels.
We certainly need more clinical data on the relationship between Vitamin D and testosterone. We have chicken data (and more chicken data here - what is it with chickens anyway) and we have rat data that suggests Vitamin D increases male (rat) fertility but we just do not have anything that says Vitamin D increases human testosterone (yet).
Anecdotally Yours,
HeartHawk
Lot's of great comments on my last blog concerning Vitamin D and testosterone. A few commenters rightly took me to task for my less than rigorous data regarding the association between my Vitamin D intake and my testosterone level. So, here is what we can say.
1. For my "n of one" study there is an "association" between between Vitamin D and testosterone levels. However, it cannot be concluded it is causative. It could be that can of "Coke Zero" I drink every day that's doing the trick!
2. It is not outrageous to speculate that there could be a link between Vitamin D and testosterone given chemistry. We just cannot prove it with my results. There is some excellent material on Vitamin D pharmacology put out by the Vitamin D Council (really level-headed stuff not marketing hyperbole) and for those who lean toward the "geeky" side this cite from AACC is nice.
3. It is unlikely my low testosterone stayed high several years after stopping my use of topical testosterone. What I really need to do is stop the Vitamin D for several months and re-check my testosterone to see if it goes lower. The problem is that Vitamin D is good for so many other things that it does not seem appropriate to discontinue it. Perhaps a new Track Your Plaque Virtual Clinical Trial might be useful where we measure "before" and "after" testosterone levels.
We certainly need more clinical data on the relationship between Vitamin D and testosterone. We have chicken data (and more chicken data here - what is it with chickens anyway) and we have rat data that suggests Vitamin D increases male (rat) fertility but we just do not have anything that says Vitamin D increases human testosterone (yet).
Anecdotally Yours,
HeartHawk