Reconstitution concentration is important for protein stability. Solutions at concentrations lower than 1 mg/mL are more prone to proteolysis or inactivation because of low-level binding to the storage vessel. Because a higher concentration than 1 mg/mL may not be realistic in some cases, it is common practice to add “carrier”, such as purified bovine serum albumin (BSA), to 1 to 5 mg/mL (0.1% to 0.5%).