Kefir Grains versus Kefir Starter: Which Should You Opt For ? To prepare your milk kefir, you may use kefir grains or commercial powdered kefir starter. This article will show you the advantages and disadvantages of using both. Powdered Kefir Starter Kefir starter (powdered) is produced commercially. You can buy this kefir starter as a multi-pack or single pack. This preparation contains limited probiotic, which...