ThreeLac is a probiotic that helps people fight candida overgrowth. It is a somewhat unusual name and is misspelled quite often. The correct spelling is "ThreeLac"; the number "Three" represents the three beneficial bacteria present in the product and the "Lac" indicates that there are lactobacillus bacteria in the product; thus the name ThreeLac. The same product can be found in Japan, but I am not aware of what name it is marketed by there.
If you would like more information on ThreeLac you can find it at: www.stopyeast.com