I’ll eat them all! Yum.
If you watch the video, all of the stuff he’s using is commercially-available medical products. Syringes come in sterilised packages, the injector part is a thing that’s specifically designed for this purpose (turning a normal syringe into an auto-injecting) and he repeatedly emphasises the importance of keeping all the components sterile.
Medicine stuff always seems scary, until you realise its just science 
