Customize your care with Boiron single medicines for highly targeted relief. Kali Carbonicum 30C is a homeopathic dilution of Kali Carbonicum that relieves Pain And Feeling Of Weakness In The Lower Back.The pellets melt in your mouth and can be taken on the go, no food or water needed. (BoironUSA.com) About Boiron: With more than 85 years of expertise, Boiron is a trusted brand that prides itself on quality manufacturing and responsible environmental practices. All products are made according to the highest standards of cGMP and formulated with HPUS ingredients for purity.