How long does opened UHT milk keep?

Three days refrigerated. Unopened, the carton keeps for months at room temperature, but opening breaks sterility and the milk becomes a fresh product again.

Is UHT milk less nutritious than fresh milk?

Protein, calcium and fat content are identical. Only some heat-sensitive vitamins such as B9 and C decrease slightly, a marginal gap in a normal diet.

How is powdered milk reconstituted?

Around 130 g of powder per litre of warm water, poured gradually while stirring to avoid lumps. Once reconstituted, it behaves like fresh milk and keeps for 24 hours refrigerated.

UHT milk, powdered milk and dairy

Without a reliable cold chain, UHT and powdered milk remain the safest formats. Both store at room temperature and only need refrigeration once opened.

UHT milk is heated to 140 °C for a few seconds then packed sterile: it keeps for months unopened, against a few days for pasteurised milk. Powdered milk takes that further, keeping for years at a markedly lower cost per reconstituted litre.

The aisle also covers sweetened condensed milk, used in desserts and coffee, and butter in packaging suited to the climate.

Frequently asked questions

How long does opened UHT milk keep?: Three days refrigerated. Unopened, the carton keeps for months at room temperature, but opening breaks sterility and the milk becomes a fresh product again.
Is UHT milk less nutritious than fresh milk?: Protein, calcium and fat content are identical. Only some heat-sensitive vitamins such as B9 and C decrease slightly, a marginal gap in a normal diet.
How is powdered milk reconstituted?: Around 130 g of powder per litre of warm water, poured gradually while stirring to avoid lumps. Once reconstituted, it behaves like fresh milk and keeps for 24 hours refrigerated.