I only know what the packaging says: Fairlife says they use soft filters (more than one) that concentrates protein and calcium, 1/2 the sugar. Non fat has 13 gr protein, 6 gr sugar, 380 mg calcium per cup.
HEB grocery (Texas grocer) calls it Mootopia, just says its ultra filtered. But usually that means filtered twice. Mootopia non fat milk has the same protein & sugar as Fairlife, but 450 gr of calcium per cup.
Both are lactose free. Neither add in lactase enzymes because the lactose is filtered out. Both are expensive!
HEB lactose free, non fat milk is ultra pasteurized, but not ultra filtered. It has a lactase enzyme added. It costs about half the others, but as I found out this week, it still has enough lactose to irritate my stomach.
Anyone need an opened 1/2 gallon of milk? 🙃