There's no need to add table sugar to herbal teas. If a sweetener is needed, use pure, raw honey. Active Manuka honey is also a natural antibiotic. Refined sugars are unhealthy for the digestive systems, and can actually interfere with the effectiveness of many herbs, as well as aggravate disease. If you are allergic to honey and other bee products, you can substitute stevia or natural Maple Syrup. (Do not give honey to babies under 12 months old as they don't yet have the enzyme needed to metabolise honey).
You may also like to add a twist of lemon or lime to your tea!