Low-impedance headphones are in the range 16 to 32 ohms and high-impedance headphones are about 100-600 ohms. As the impedance of a pair of headphones increases, more voltage (at a given current) is required to drive it, and the loudness of the headphones for a given voltage decreases.
Yes, taking to much Vitamin D can cause some people to get diarrhea. Some others may experience constipation from to much Vitamin D.
Overdosing of Vitamin B12 can cause nerve dysfunction, diarrhea, and other side effects. My general advice is that if you do not have a vitamin defeciency, the a general multivitamin once daily is all that you need. ...Read more.