helps maintain that \'get up and go\' feeling,but the active ingredient is not caffeine,often recommended to women as the best choice,high strength extract, and known level of \'actives\'siberian ginseng is the world\'s best known and highly researched \'adaptogen\' which is used by millions every day. as an adaptogen it helps us tackle our daily workload. in fact, because it has a caffeine type of action in maintaining that \'get up and go\' feeling it really is best taken first thing in the morning.nature\'s best siberian ginseng is a sophisticated extract that has guaranteed levels of the active ingredients called eleutherosides. it is these substances that are used as markers in preparing a standardised extract and each tablet therefore contains 810µg eleutherosides. many products give no indication of potency and we think they should be viewed with caution.although its uses are similar to that of korean ginseng many people, particularly women it is said, find that siberian ginseng works better for them. it is regarded as a more gentle preparation and, indeed, is often referred to as the female ginseng. at this quality we don\'t believe that you will find cheaper.