Ferr phos is usually indicated during the beginning stages of colds and inflammation. However, it is also useful to strengthen the system when anemia and recurring colds, especially throat symptoms and coughs are present.

Kali phos is indicated when the entire system is weak, especially the immune and nervous systems. The least emotional stress causes fatigue or weakens the immune system.

Calc phos is excellent for run down conditions developing after an illness or associated with anemia. Repeated colds and general fatigue are common.

Calc sulph is useful when infections will not resolve, allowing yellowy discharges to persist for a long time. Symptoms are worse in wet weather or from getting wet.

Silicea is useful when vitality is poor and repeated colds, sore throats and other infections persist. Silicea promotes the discharge of pus, allowing chronic inflammatory conditions to heal. Its action is slow but deep.