L-HISTIDINE HCL is a white crystalline powder that is freely soluble in water and soluble in formic acid. It contains not less than 99.0 percent and not more than 101.0 percent of L-HISTIDINE (C6H9N3O2), calculated on the dried basis. L-HISTIDINE HCL is commonly used as an excipient in pharmaceutical applications due to its benefits. It has antioxidant properties that can help protect active pharmaceutical ingredients from degradation. L-HISTIDINE HCL also has anti-inflammatory effects which can help reduce side effects of certain medications. Its solubility and stability make it well-suited for use in oral and topical drug formulations.