Costco's Kirkland Signature milk has become a topic of fascination among shoppers, thanks to its noticeably longer shelf life compared to other supermarket brands. Customers have taken to social media to share their surprise at finding the milk still fresh well past its printed expiration date.
The Science Behind the Shelf Life
Dairy experts explain that Kirkland milk's extended freshness comes down to superior processing techniques. The ultra-high temperature (UHT) pasteurisation method used by Costco's suppliers kills more bacteria than standard pasteurisation, while the milk's airtight packaging prevents contamination.
How Kirkland Compares to Other Brands
While most UK supermarket milks last about 7-10 days after opening, Kirkland milk often remains fresh for 14-21 days. This difference has made it particularly popular with large families and those who want to reduce food waste.
Consumer Reactions
"I was sceptical at first," shares one Costco member from London. "But after three weeks, my Kirkland milk was still perfect for cereal and coffee. Now I won't buy any other brand."
Food safety experts caution that regardless of the expiration date, consumers should always check milk for signs of spoilage before consumption.
