ThreeLac is a probiotic http://www.webmd.com/digestive-disorders/tc/probiotics-topic-overview that many candida sufferers use to help treat their Candida or yeast disorder. In fact it is specifically made for it, it is manufacture red in Japan.
I can’t personally tell if Threelac is better than many other probiotics but it has three live bacteria, bacillus coagulans, bacillus subtilis and enterococcus faecalis, hence the name threelac. I do not believe this is really a lot of positive probiotics, and do think there are plenty of other probiotics which work at least as effectively, without the downsides.
If you look at Threelac it is relatively expensive for the amount of beneficial bacteria included. Even though it only has three forms of beneficial bacteria, there are a lot of ingredients, including two negative ones refined yeast powder (why would you be taking yeast to get rid of yeast), and lemon powder. They really do not go into detail about each detail the amounts, the quantities, but I’m sure you can find it if you search.
Instead I recommend you get probiotics at your local health food store. They are most likely stronger, cheaper, and just better. They will have several more live beneficial powders, and you will not have to mix it with water to be able to safely consume it. The only time I do recommend taking Threelac is if it was your only choice due to your unusual living situation or circumstance, then I would say it is better than taking nothing.