They look like this and come in larger sizes up to 1 L:

I've read that it's fermented milk, but when I type that into Google I get something that looks like a watery yogurt. And not orange in color (white).

I tried the taste of it, and it tastes much sweeter than regular milk. I was hoping that the lactose would be more processed, because that's what I read of fermented milk, but I had diarrhea afterwards, another sign that it's not fermented milk.

So what is it? Is it more or less healthy than regular milk? In particular I'm looking for a good amount of protein.

I suspect you are referring to the Betagen products on sale in Thailand.

http://www.betagen.co.th/web/products/?lang=en

That's it, guess it is fermented milk

I suspect you are referring to the Betagen products on sale in Thailand.

http://www.betagen.co.th/web/products/?lang=en

Yes, Betagen is the popular brand in Thailand found about everywhere.

A small 85 ml bottle cost 10 Baht or so.

Makes a price of 118 Baht/liter.

(I don't know the prices for bigger bottles)

For comparison:

Yakult in Germany about 8 EUR/liter ~ 300 Baht/liter.

The health effect of all that stuff is often disputed.

I drink it for a change.

I found some discussion about the number of bacteria in the stuff.

My little Betagen bottle shows "9000 million" (in Thai).

And the Thai website says it: it;s per bottle.

Edited May 2, 201610 yr by KhunBENQ

Yogurt to drink.

Most Thais call it "nom prieow" (sour milk).