I am planning to culture human mammary epithelial cells bought from Lonza. Unfortunately a lot of the media+growth supplements these companies sell (including Lonza, PromoCell, ATCC) significantly reduce the shelf-life of the media from 2 weeks to 1 month once the media is mixed with the supplements. If there is any way to avoid this or if someone has grown these cells with an alternate, more long lasting and simpler culture medium, I would appreciate details and recipe. Thanks much.