Guayaki, Sebastopol, CA, has added Pure Heart to its line of organic yerba mate drinks. The product features rainforest yerba mate, hawthorn and yarrow—herbs known to enhance cardiac performance—along with organic raspberry juice. Yerba mate contains 24 vitamins and minerals, 15 amino acids, 11 polyphenols and the natural stimulants: caffeine, theophylline and theobromine.