Birt tangs ginseng herbal tea uses all types of this legendary tonic herb and combines it with other energising ingredients to give you a natural boost to your day as its caffeine free it does not disturb sleep or create irritability yet it increases alertness ginseng is used to increase physical and mental efficiency and studies have shown that it can reduce stress and fatigue birttangs ginseng herbal tea has an earthy natural flavour and is certain to add a spring to your step