One of the neglected strengths of homeopathy is the ability to correct problems of absorbtion of material in the gastro intestinal tract. There seems to be very little awareness that the indiscriminate use of antibiotics kills off the micro organisms that live in the gut and form a synbiotic relationship - in that they help to transfer various nutrients via the "brush" lining , into the bloodstream.
One case I am dealing with at the moment has been advised to give her son Iron supplements [ this along with iron injections ] DEPRESS the body's natural ability to absorb iron.
I have advised the use of Fer phos 3x [ with possible use of Fer Met.] purely to asisst the body to absorb the iron rather than let it pass out the other end.
Also there is the phenomenon of Osteoporosis. This again is down to the use of antibiotics that KILL the beneficient micro organisms that allow the body to absorb Calcium. When the thyroid senses that there is insufficient calcium in the bloodstream it sends out hormonal messengers to ask the gut to take in more calcium from the food passing by. The gut cannot do this because of the action of the antibiotics , so it has to go to the body's "larder " of calcium -- the skeleton -- and draw its needs . Thus Osteoporosis. Interesting that the Parathyroid often issues a hormonal messenger that says "Dont take TOO much".