c582c6a3_About_hCG___Resources__Source
Extremely high - since it is mixed for you in a licenced compounding pharmacy in a sterile environment with pharmacy-quality products, so long as you take basic injection safety measures it's great Depends - since you must mix it yourself, and do not have a sterile environment in which to mix, you are the variable. The product is good, but mixing is where it can get contaminated. [Source] 
Safety
About hCG | Resources
Source