Customize your care with Boiron single medicines for highly targeted relief. Phosphoricum Acidum 30C is a homeopathic dilution of Phosphoricum Acidum that relieves Poor Concentration Due To Overwork.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.