Phosphate buffered saline (PBS) is a buffer solution containing sodium chloride, sodium phosphate, and in some formulations potassium chloride and potassium phosphate. PBS helps to maintain a constant pH and is isotonic and non-toxic to cells. This formulation does not contain calcium and magnesium. Complete Certificate of Analysis available for each production lot, along with full formulation information Manufactured in a facility that complies with ISO 13485 certified quality system. This product is produced under high quality industry standards.