Earwax or even a piece of hair could be lying on top of the eardrum and when the eardrum vibrates, it may cause funny noises (just like a piece of string on a lightly beating drum). Obviously, treatment is by removal. Eustachian Tube Dysfunction can also cause crackling/popping noises.
Adverse Reactions to Elemental Iron Supplements Meeting your daily iron recommendation is important, and you may have to take supplements to get what you need. Iron's primary function is carrying oxygen through your blood and delivering it to cells, tissues and all of your organs.
This means that the nutrients dissolve in water in your body, which allows for you to excrete excess amounts in urine. Although iron supplements are water-soluble, the iron that they contain is not. As your body does not easily excrete excess amounts, too much iron can be toxic. Fortunately, you would need to take at least 20 milligrams of iron for every 2.2 pounds of body weight to experience iron toxicity.