Lactic acid bacteria (LAB) are bacteria that can produce lactic acid
during the metabolism process. The LAB used as fermentation agents
in yoghurt generally include Streptococcus thermophilus, Lactobacillus
delbrueckii ssp. bulgaricus, Lactobacillus acidophilus, Bifidobacteria
species, Lactobacillus casei, Lactobacillus plantarum, and
Lactobacillus rhamnosus. The effects of yoghurt validated by researchers
include the improvement of lactose intolerance