The Japanese probiotic drink Yakult dates back to the 1930s.
Human digestive health is greatly enhanced by lactose and it is considered safe for those who are mildly lactose-intolerant.
Drinks like this are available in small single-serving containers and are recommended for daily consumption. At least for human consumption.
There is quite a bit of sugar in it however so perhaps scale back if you have diabetes obesity or other related conditions.