“Pure Heart” is now called Raspberry Tereré (pronounced tey-dey-rey), blending raspberry with heart-supporting yarrow and hawthorn berry herbs. Back in the day it was called Raspberry Revolution. Brewed with our air dried yerba mate (unsmoked secondary drying process). 16 oz glass bottle. Guayakí Bottled Yerba Mate - Finally, an invigorating mate blend that tastes great! Each Guayakí Organic Yerba Mate bottle contains caffeine levels comparable to a cup of coffee, however, the stimulation is balanced by mate's natural theobromines and theophyllines as well as other restorative nutritional content. As a result, drinkers feel a sustained energy, clarity of mind, and the general well being characteristic of mate. Grab a bottle before any physical activity or going back to the office, and experience the good energy. Guayaki's Organic Yerba Mate Fusions are inspired by the yuyeras (herbalists) in Paraguay that have been using yerba mate as the base of herbal medicine remedios (remedies) for centuries. It is believed that yerba mate's complex blend of stimulants and nutrients acts as a powerful catalyst to enhance the power and efficacy of other herbs and helps to assimilate the herbs into the body. Organic Yerba Mate Fusions combine rainforest mate with potent traditional herbs from around the world to gain the desired effect such as Gingko Biloba and Siberian Ginseng from China, Tulsi from India, Himalayan Crystal Salt from Pakistan, Damiana from Central America and Catuaba from Brazil.