Yes, milk powder does eventually go off, but its shelf life is significantly longer than liquid milk. While manufacturers often suggest using it within 18 months, the USDA states that powdered milk can be stored indefinitely. An unopened package can remain usable for two to ten years past its "best by" date.
Understanding Milk Powder Shelf Life
Several factors influence how long milk powder remains safe and palatable:
- Storage Conditions: Keeping milk powder in a cool, dry, and airtight container is crucial. Heat, moisture, and exposure to air accelerate degradation.
- Packaging: An unopened, factory-sealed package provides optimal protection against spoilage. Once opened, transfer the powder to an airtight container to maintain quality.
- "Best By" Date: This date indicates peak quality, not necessarily safety. While the product might lose some flavor or nutritional value after this date, it doesn't automatically become unsafe to consume.
Signs of Spoilage
Although powdered milk can last a long time, watch out for these signs of deterioration:
- Off-Odor: A rancid or sour smell indicates spoilage.
- Clumping: Significant clumping might suggest moisture absorption, a sign of potential spoilage. Minor clumping is sometimes normal.
- Discoloration: Significant changes in color might also signal that the milk powder is no longer at its best.
Conclusion
While milk powder has an extremely long shelf life, it's not truly immortal. Proper storage is essential for maintaining quality and safety.
