Doppelherz Tianmao International Overseas Flagship Store.Doppelherz "Double Heart" is a famous German health care brand with a long history, in 1919, German chemist Josef Peter Hennes extracted the active ingredients from herbs and other natural plants to make Double Heart's famous Herbal Energy Conditioner (used for heart function conditioning). In 1919, German chemist Josef Peter Hennes extracted the active ingredients from herbs and other natural plants to make the herbal energy toner (for heart function), from which the name "Double Heart" was derived.