[gibagger]

In my opinion, the best lactose free milk has some lactose filtration in the process. The brands that just dump lactase on the milk without filtering lactose are actually sweet, like they dumped a bunch of sugar in it.

[theGeatZhopa]

It's not possible to filter lactose out of the milk. The only possibility to get lactose free milk is to split lactose into glucose and galactose with the enzyme lactase. And that's actually is done: just dump lactase into cow milk. I never drank not sweet lactose free milk.

But, if one is about to make a milk powder, then it is possible to remove the split lactose sugar crystals. But it's not milk anymore..

[masklinn]

You can do it the other way around: instead of filtering lactose out of the milk you filter the solids making a protein and fats concentrate.

This is mostly used as a preprocessing step for cheese production, but by rehydrating you get ultra-filtered milk, which are lactose-free and not sweet.

[oidar]

Fairlife brand lactose brand milk claims that they are able to do it.

[lesuorac]

Well yeah it tastes like they dumped a bunch of sugar because that's basically what they did.

The enzymes take 1 sugar (lactose) and break it down into 2 sugars (glucose and galactose).