The source of this remedy is flint, which is primarily silica or silicon dioxide, one of the tissue salts. Silica is essential for growth and bone development, is present in connective tissue, and helps to keep cartilage flexible and skin permeable.
Silicea is of most benefit to children who are puny and lacking in stamina, especially if they have a rather large, sweaty head, delicate skin, sandy hair, blue eyes and small hands and feet. Such children tend to be very lively and friendly, angels if managed properly but devils if they are not. Intellectual adults also benefit from it.