Vitamin D

"There was a 25% jump in blood levels of vitamin D in people who popped the probiotic lactobacillus reuteri." Journal of Endocrinology and Metabolism

Those of us who live in the northern hemisphere tend to have low vitamin D levels because it is difficult to get enough sunlight to produce the vitamin D in our bodies.  This is good news that there is another way to boost those levels.  However, I checked the probiotic I have in the refrigerator and it does not say lactobacillus reuteri; it says just lactobacillus acidophilus -- so apparently not all probiotics contain the same bacteria.  This might be worth checking out if you have been tested and told you have low levels of vitamin D in your blood.