I am using 2-Mercaptoethanol as cell culture supplement. As it is not stable in media and I have to add media every 2/3 days, I am making fresh media every 2/3 days, which is not very convenient. I am looking for sterile 2-Mercaptoethanol stock, so that I can make the media in good amount and add the 2-Mercaptoethanol every time fresh I use. Does anyone have any suggestion?