Most people these days are using what are called subcutaneous needles for their hCG injections, and this delivers the hCG into your fat. So not the skin, but into the fat. This will then be absorbed into your bloodstream. This is different from what’s called an Intramuscular injection, where there is a longer needle that injects into the muscle (below the fat layer) – this too would be absorbed into the bloodstream.
You can see my full set of hCG Injection Tutorials that walks you through each step on camera.
The good news is the needles are very thin and short and don’t hurt at all!