Schüssler Tissue Salts act on the cellular level to balance and restore cell function. UNDA - Products Tissue Salts are prepared using methods based on Dr. W. H. Schüssler Biochemical System of Medicine (in accordance with the German Homeopathic Pharmacopoeia [HAB]). UNDA - Products is a world-renowned homeopathic products company founded in 1949 in Harzé, Belgium. Established over half a century ago in Belgium, UNDA - Products is renowned for manufacturing exceptional homeopathic products that use only pure materials and herbs that are biodynamically grown or wildcrafted. Its diverse product line includes single-ingredient and combination homeopathic remedies, topical creams, tablets, and natural health products. UNDA - Products products are formulated using a combination of GMO-free plant, mineral, and organic raw materials obtained primarily from local sources.