My bud who is on with me hes 20 and its his first cycle too. Hes doing 225mg every 4 days along with me...im fine but he keeps talking about kidney pain--is this normal???? He was taking 10g of creatine a day but I told him that can cause kidney issues for some people and told him to get off that, and up his water intake alot but yet he still talks of lower back pain......anyone ever had this problem?