I have an abundance of milk kefir grains since these babies just proliferate themselves. I raised them on raw milk, which I cannot share with anyone (legally) so please bring your own jar of milk :) Great for probiotic health, and also for natural cheese making! Email me if interested. For more info about milk kefir, check out these links: https://draxe.com/kefir-benefits/ http://www.culturesforhealth.com/learn/milk-kefir/milk-kefir-frequently-asked-questions-faq/