Customize your care with Boiron single medicines for highly targeted relief. Cuprum Metallicum 30C is a homeopathic dilution of Cuprum Metallicum that relieves Sudden Muscle Cramps.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.