Since the endocrine system (glandular system) is responsible for the chemical balances in our bodies, keeping the balance between the chemicals is very intricate. Therefore it is very common when one part of it is imbalanced, that all chemicals are affected. Depression (which is caused by lack of serotonin (a chemical manufactured by the endocrine system) is often accompanied by thyroid problems and stress and fatigue, caused by exhausted adrenal glands. Blood sugar problems often also go hand in hand with adrenal problems and thyroid problems. This then affects the hormones, causing menstrual problems in women and testosterone problems in men. For this reason, you will see that many of the formulas contain herbs which are also useful for other parts of the body which are normally affected by that gland not working properly.
Learn about how the glandular system regulates activities in the body.
If one hormone / chemical is out of balance, all of them are so it is vital to determine where the problem originates.