Zam Zam water contains elements that are as good as modern medicinal cures a part from this it has spiritual powers that cannot be explained medicinally but god has made the water which can be used for curing diseases only with the command of god.
Drinking the water, seeking help from god, and reciting Quran have proven good results for curing human diseases and increases the spiritual power with God’s help.
The water has a history and came to existence from the sacrifice of Hajra (RA) peace be upon her who was the wife of Prophet Ibrahim(AS) peace be upon him, She was left in the desert of Saudi Arabia due to command given by god and due to her struggle and sacrifice God have given the water and Angel Jibrael came to earth from sky to give this gift for the whole mankind.
The water started coming from that period which is still coming and will come as long as god allow it to come from earth.