I culture cells for a living. Not that these are the only ways, but the most common and effective ways to grow cells in the lab is to add either FBS (fetal bovine serum) or BSA (bovine serum albumin) to the culture media. Currently we don't mass produce BSA in an animal free manner and FBS is by nature an animal product. Granted, that the products of one animal may in fact allow manufacturers produce more than enough 'animal-free meat' to overcome this but I haven't seen any numbers. I'm interested in hearing more about these techniques going forward and in determining if animal-free products can really be produced animal free.