[[традиционална храна]] народа Банту из [[Јужна Африка|Јужне Африке]].
Од 1970-их неки произвођачи користе хемијско закисељавање уместо [[Биолошки агенаси|биолошких агенаса]]. <ref>{{Cite web|url=Nakamura, Yasunori; Yamamoto, Naoyuki; Sakai, Kumi; Takano, Toshiaki (June 1, 1995). "Antihypertensive Effect of Sour Milk and Peptides Isolated from It That are Inhibitors to Angiotensin I-Converting Enzyme". Journal of Dairy Science. 78 (6): 1253–7. doi:10.3168/jds.S0022-0302(95)76745-5. {{PMID|7673515}}. Retrieved 2007-06-30.|title=|last=|first=|date=|website=|archive-url=|archive-date=|dead-url=|access-date=}}</ref><ref>{{Cite web|url=Sukhov, SV; Kalamkarova, LI; Il'chenko, LA; Zhangabylov, AK (1986). "Microfloral changes in the small and large intestines of chronic enteritis patients on diet therapy including sour milk products". Voprosy pitaniia (in Russian). Jul-Aug (4): 14–7. {{PMID|3765530}}.|title=|last=|first=|date=|website=|archive-url=|archive-date=|dead-url=|access-date=}}</ref><ref>{{Cite web|url=5.^ US patent 3625702, Exler, Heinrich, "PREPARATION OF SOUR MILK DRINKS", published 1971-12-07, issued 1971-12-07, assigned to Heinrich Exler|title=|last=|first=|date=|website=|archive-url=|archive-date=|dead-url=|access-date=}}</ref><ref>{{Cite web|url=6.^ US patent 3978243, Pedersen, Jens Kristian, "Process for preparing gelled sour milk", published 1976-08-31, issued 1976-08-31, assigned to Kobenhavns Pektinfabrik|title=|last=|first=|date=|website=|archive-url=|archive-date=|dead-url=|access-date=}}</ref>