, high strength extract standardised at 3% rosavins correct dose & species of rhodiola perfect partner to siberian ginseng magasorb & theanine, excellent value for uk-made taste free coated tabletsnature’s best rhodiola is a premium high strength extract equivalent to 500mg of dried rhodiola rosea obtained from the rhizome & root of the herb. standardised to ensure that it contains exactly what the label states 2 tablets provides a guaranteed 3.75mg (3%) of precious rosavins the ‘active’ compounds found in the herb & referred to in studies. in the course of developing our product we tested a number of raw materials available & determined that the few claiming to contain higher percentages than 3% often did not. the raw material we use is specifically tested for its rosavin level & reassuringly we screen all herbal materials to ensure none have been irradiated. rhodiola rosea has been used for centuries & it makes the perfect partner to siberian ginseng magasorb® & our theanine/lemon balm supplement.