1 vivarian everyday isn't that much.
High amounts of caffine
Caffine helps to aid the loss of sodium, potassium, calcium and other essential vitamin's from your body including vitamin B, this intern increases your bodies need for vitamins from other sources, such as supplements.
Caffine greatly increases your risks of gaining bladder cancer, especially in women.
There are high risks that large daily consumtion of caffine (7 cups + per day) in pregnant women can increase the risks of miscarriages, still births or fetal deaths
A vivarian is about 2 cups of coffee. I know 1 cup of coffee a day is considered healthy (or healthier still a tea) because caffine also illistrates some positive effects on the body one of which is believed to aid against altimers disease.
So 1 vivarian isn't thaaaaaat bad I would still only take it pre-work out otherwise you get accustomed to the caffine intake and theres none of the benefits left in it that originally got you started.