Although there are many choices for alternative medicine for mental health, please keep in mind that nothing replaces proper therapy for those extreme cases of mental distress. Medications for issues such as schizophrenia and other serious mental illnesses should not be set aside for the likes of simple herbs. Always discuss your choices with a qualified medical or mental health professional. Remember: Safety FIRST! 

Asian Ginseng (panax) having also been called the "King of Herbs", has been used in Chinese medicine for well over 2,000 years. It's botanical name, panax, comes from the Greek words "pan (All) and "akos" (cure), In other words folks, it's a cure-all kinda find.

In traditional Chinese methods, ginseng tonic was used to increase blood volume, increase appetite, increase strength, promote life, give wisdom and calm the spirit.

For improving mental capacities, alertness and concentration the recommended dosage for a healthy person is 500-1,000 mg daily, taken in two doses. This is short term usage only, mind you. Chinese herbalists recommend you take Ginseng for 15-20 days then stop for two weeks before starting again. This cycle, it is said, can be repeated endlessly.

You can also drink ginseng in tea format. One cup of tea daily can help make you more mentally aware/alert.

CAUTIONS:

Ginseng should not be taken continuously, as I stated above, without breaks, with one notable exception - long term use for the elderly or the chronically ill.
Don't take Ginseng if you have hypertension, take anti-psychotic drugs, steroid therapy or drink a lot of caffeine. Coffee addicts need not apply, in other words.
Use with caution and preferably a doctor's advice if you have diabetes, high or low blood pressure or any cardiac issues.