Schessler Tissue Salts Schessler Tissue Salts act on the cellular level to balance and restore cell function. UNDA Tissue Salts are prepared using methods based on Dr. W. H. Schessler Biochemical System of Medicine (in accordance with the German Homeopathic Pharmacopeia [HAB]). Established over half a century ago in Belgium, UNDA is renowned for manufacturing exceptional homeopathic products utilized in supporting immune, lymphatic and endocrine systems. In the production of all homeopathic remedies UNDA uses only pure materials and herbs that are biodynamically grown or wildcrafted. UNDA produces a broad range of homeopathic products in various potencies including: the unique Numbered Compounds, Gemmotherapy macerates, Schessler Tissue Salts, Gammadyn Oligo-Elements, Organotherapy, Plexes, creams and oils, as well as homeopathic compatible dental care.