I picked up several 10ml bottles of T400 some time ago. I went to use my last bottle in conjunction with deca300 and noticed the T400 had expired 08/06. Im using it anyway but am wondering about bacteria level and potency. It still stings like a mother f----- but I'm used to it. Should I substitute something else or keep the expired T400. What's the risk of expired gear? Any knowledge is appreciated.