When searching for the best lactase enzyme supplement, it’s important to consider several factors. First, the dosage strength should be appropriate for your level of lactose intolerance.

Lactase 1250Units; per 5 drops; liq. Add 5–15 drops to quart of milk; hydrolyzes 70%–99% of lactose at refrigerator temperature in 24 hours.

While "some people who use [lactase enzymes] claim they need to continue increasing their dose over time, this is more likely ...

We examined the dose-related effects by human-native LF ... In contrast, sucrase and lactase activities were increased at low but not high LF concentrations and their mRNA were also increased ...