Keep servings to two or three a day. Alcohol provides calories but little else. It can slow reflexes, metabolism and your ability to focus. Both caffeine and alcohol also pull water from the body, which cuts into your energy. For every caffeine or alcoholic beverage you drink, follow it up with an extra glass of water.
Some herbal mixtures promise peppiness.
Most lack valid science to support these claims. Some herbals have concerning side effects and, because they are not regulated, there's no way of telling how much of the herb you are getting and how effective it will be. For a better boost, stick with a healthful diet and a 15-minute walk each day.