Doctor's Formulas Inositol Formula dietary supplement contains inositol, folic acid, vitamin B6 and vitamin B12.
The above components contribute to the normal functioning of the immune and nervous systems , as well as to the normal psychological function. 
Actions of Inositol:
Inositol is known as vitamin B8 , a natural isomer of glucose.
It is an important intermediate key element of the second messengers, but also a dominant component of the phospholipids of cell membranes involved in many biological processes.
Its unique chemical structure allows it to "enter" and "exit" cells, playing its catalytic role.
It plays an important role in how neurotransmitters work in the brain and body , including reversing serotonin desensitization, thus regulating serotonin activity.
It is also important for transducing signals for calcium and insulin.
It is also  a component of the biological information exchange system. Inositol contributes to the processing of information within the cell, e.g. of the biological information contained in hormones. Second messengers are molecules inside cells that act to transmit signals from a receptor to a target. The term, second messengers, was coined after the discovery of these substances, in order to distinguish them from hormones and other molecules that function outside the cell as "first messengers" in the transmission of biological information. A large number of molecules have been characterized as second messengers, including molecules derived from phospholipids (inositol triphosphate). 
Dosage:  1 - 2 tablets / day