The additional cell salts were discovered by pupils of Dr. Schüssler. Their areas of application were tested and developed by these pupils.
Different authors refer to 12 or 15 additional cell salts. Only some authors and practitioners accept the last three additional cell salts.
They are accepted case by case when her occurence in the human body is proved and their use as a remedy is recognized.
The additional cell salts (No. 13 to 24) can't be found everywhere.
In some countries (i.e. USA) there are only few vendors who offer them.