How to take lactase tablets

Lactase tablets work best when you get two things right: timing and dose. Neither is complicated, but small mistakes are the usual reason people decide "they don't work for me" when they might.

Take them shortly before the dairy

The enzyme needs to be in your gut, ready, when the lactose arrives. The evidence supports taking your tablet shortly before a lactose-containing meal — studies used a window of roughly 5–30 minutes beforehand, and health authorities simply say to take them before eating. In everyday terms: take it as you sit down, with your first mouthful of dairy, not after the bloating has already started, which is too late to help.

Match the dose to the meal

Lactase strength is measured in FCC lactase units (some brands label it ALU — near enough the same thing). A splash of milk in a coffee needs far less enzyme than a cheesy pasta and ice-cream dinner. The randomised trials that showed a benefit used fairly high doses, around 13,500–15,000 FCC units per lactose load, so if a single low-dose tablet does little for a big dairy meal, a higher-strength product or an extra tablet is a reasonable next step.

One honest caveat: there's no solid evidence of a neat "more is always better" dose response. Use enough to cover the meal, but don't assume doubling up guarantees a better result — individual response varies.

For long or dairy-heavy meals

The enzyme's effect is short-lived — it works over a limited window. If you're grazing across a long dinner or a cheese board that stretches over an hour or two, a single dose at the start can wear off. Taking a second tablet partway through a drawn-out, high-lactose meal is a sensible move.

Chewable vs capsule

Both deliver the same enzyme. Chewables act fast, need no water and are easy to carry for eating out; capsules are just as effective and some people find them easier to swallow without a taste. Pick whichever you'll actually remember to use — the best tablet is the one that's in your pocket at dinner. (When our independently tested rankings go live on the what helps page, we'll say which formats held up best.)

Set realistic expectations

Even taken perfectly, lactase tablets reduce symptoms rather than remove them, and they don't work equally for everyone — we cover the evidence in full on do lactase tablets actually work?. Pairing them with a sense of your own limits helps: our lactose content chart shows which foods carry the biggest hit, so you know when a tablet is worth it and when the food is low enough to skip it.