 The procedure for evaluating the efficacy of the G-PenTM glucagon injection consists of inducing hypoglycemia by intravenous administration of regular insulin diluted in normal saline. Each participant will undergo two episodes of insulin-induced hypoglycemia, and in random order will receive 1 mg G-PenTM glucagon injection during one episode and 1 mg Lilly Glucagon during the other episode. There will be wash out period of 7-28 days between treatment visits. 