Using HGH without a prescription is illegal. However, bodybuilders still use it. Most guys cycle it for 6 to 8 weeks followed by some time off. There are many side effects that can occur because of HGH use and they can be potentially damaging to your internal system. Inexperienced users can even slash an artery or bleed to death while administering injections. In all possibilities, I would suggest that you do not use HGH injections and rather try to boost HGH levels in your body with the help of natural supplements that are safe and free of side effects.