When I picked up a 2000mg/10ml vial of testosterone from the the pharmacy like I always get they had replaced it with 10 200mg/ml vials. I asked why and she said it was flagged in the system because the bigger vials expire in 28 days after opening and piercing with a needle. I looked it up online and found this quote from the cdc....."If a multi-dose has been opened or accessed (e.g., needle-punctured) the vial should be dated and discarded within 28 days unless the manufacturer specifies a different (shorter or longer) date for that opened vial." I've been on TRT for about 8 years now and I have never heard anything about this until now. And there was nothing in the package insert about this.Is it bullshit or is it a real concern?