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.
A 325 mg iron supplement contains the following amounts of elemental iron depending on the type of iron: 1  Ferrous fumarate. 108 mg of elemental iron. 2  Ferrous sulfate. 65 mg of elemental iron. 3  Ferrous gluconate. 35 mg of elemental iron.