Read more here: http://en.wikipedia.org/wiki/Human_chorionic_gonadotropin
How To Properly Mix HCG:
As you all know, hcg comes in a powder form and needs to be mixed with bacteriostatic water in preparation for injections. In this example, we will use a 5,000 unit vial. Obviously, you need to observe the math and adjust according to how you want your hCG concentrated per CC.
Step 1: Transfer 5 CC's of bacteriostatic water into the vial containing your HCG powder. No more than 3 CC's at once.
Step 2: After each bacteriostatic water transfer, you'll need to draw out just as much air to release pressure.
Step 3: Swirl the mix gently and keep it in the refrigerator.
Once you've completed your mix above, you now have a 5,000 iu vial that contains 1,000 iu's of HCG for every CC. So if you want to shoot 250iu, that would be 0.25 CC/ML. Or 25 units on a slim pin. I usually suggest injectable B12 to mix HCG. Which will Help you to get both B12 and HCG in one shot.
How to dose and to the math when mixing the HCG:
A lot of people still don't understand how to calculate their doses after mixing. Note that CC and ML are the same thing. So here is the math to prevent anymore questions about this...
A standard insulin syringe can hold 1 CC in volume. Each barrel will have markings in 1 unit increments up to 100. So each CC displays 100 unit markings.
Step 1: Amount of HCG per CC (result of step 1) DIVIDED BY 100 (number of units on a pin) = amount of hCG per unit.
Example: 10,000 / 10 = 1,000H
Step 2: Amount of hCG per CC (result of step 1) DIVIDED BY 100 (number of units on a pin) = amount of HCG per unit.
Example: 1,000 / 100 = 10
Step 3: Amount desired per injection DIVIDED BY amount of hCG per unit (result of step 2) = Number of units to draw from your mixed vial.
For example: 250 IU / 10 = 25 units. You would draw 25 units, or a quarter of a CC on a pin.