Homeinsulin pens Insulin pens.. A small bottle of insulin inside the pen and is surmounted by a needle injection Use insulin pens became commonplace a decade ago and placed a small bottle of insulin inside the pen and is surmounted by a needle injection. Facebook Twitter Share:Insulin pens.. A small bottle of insulin inside the pen and is surmounted by a needle injection Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email