i usually get my hcg locally and 5000 ius comes in 5 mL vial along with a vial of bac. water to constitute with. well i ordered some in this time from a site I frequently use and its 5000 iu's in 1 mL vial with a 1 mL amp of sodium chloride. i can do the math and get the shots right, but whats with the sodium chloride? i have some bac. water still, should i just use that like i normally do? or is there some advantage to the sodium chloride that im not aware of?