Sodium Chloride used to mix HCG only good for immediate injection?

[eckstg]

I am currently trying HCG instead of injectable testosterone to raise my testosterone production.I save money by ordering the higher dosed iu vials, which come with 2ml sodium chloride for reconstituation.I have been mixing the 2ml of sodium chloride and take 1/2ml immediately and stor the 1.5ml left in the fridge to be used over the period of the next 2 weeks.A friend mentioned the sodium chloride solution is made for immediate injection and may make the following mixture stored away useless.Anyone know if its ok to continue to use and store the HCG with sodium chloride or should i switch to using bacteriostatic water, or sterile water, or b12 injectable instead?

Any help would be appreciated!