The volume of each peptide is measured in milligrams. Each peptide is sold in various volumes. Often time, peptides are over compensated for with product which may make other peptides look under compensated for. We strive for the highest quality in customer service, therefore, if you are questioning the volume of the powder and feel it may have been under compensated, do not open the vial and please Submit a Ticket in our Help Center. We will request that you email us a photo of the vial so we can evaluate the amount of product and determine whether or not we need to send out an exchange.