There is so much news about vitamin D deficiency these days that you have probably already considered taking a daily supplement to boost your vitamin D reserves. But did you know that taking a supplement is no guarantee that there will actually be an increase in your blood levels of vitamin D?
I was surprised to hear this from a friend over dinner this past weekend. He happens to be a physician, so the conversation was particularly worthy of attention. He shared that even after one year of taking a daily supplement, the 25-hydroxy-vitamin D level in his blood did not change. Even though this is the experience of only one individual, and may not apply to others, it is noteworthy.
Vitamin and mineral supplements are sold with a detailed list of each vitamin and mineral and their amounts on the package. The ingredient list shows the sources of these vitamins and minerals. But there is no information on how much will actually be absorbed in the body.
This is clearly quite disturbing. When the FDA approves a drug, they want to see all the data that proves its safety and effectiveness. Vitamins are not regulated, which means that they are not subject to this level of scrutiny.
What is your experience? If you are taking a supplement, or giving one to your child, have you considered this issue?