How to Store Lactoferrin Supplements: Stability and Shelf Life

Expert Summary

Lactoferrin is a glycoprotein that denatures (loses structural integrity and biological activity) when exposed to excessive heat, humidity, or UV light. Because its biological activity depends on its three-dimensional protein structure, storage conditions meaningfully affect the potency of lactoferrin supplements over their shelf life.

Key Storage Facts

• Temperature: Store at room temperature (below 25°C / 77°F). Lactoferrin is stable at room temperature for the labeled shelf life when stored properly. Refrigeration (2-8°C) extends stability but is not required for most commercial formulations. Avoid storage above 30°C; sustained heat accelerates denaturation.
• Humidity: Moisture causes protein degradation. Store in a cool, dry location away from bathroom medicine cabinets (which are frequently humid from shower steam). Keep the cap tightly sealed after each use.
• Light: UV light damages proteins through photooxidation of aromatic amino acids (tryptophan, tyrosine, phenylalanine). Store in the original opaque container or a dark cabinet. Avoid leaving bottles on windowsills or counters with direct sunlight exposure.
• Refrigerator storage: While refrigeration is not required, it extends stability for opened bottles in warm climates. Allow refrigerated capsules to reach room temperature before opening to prevent condensation inside the bottle, which introduces moisture.
• Shelf life: Commercially produced bovine lactoferrin supplements typically have a 2-year shelf life from manufacture date when stored correctly. Use by the date on the label. Significant potency loss may occur in improperly stored supplements well before the expiry date.
• Signs of degraded product: Color change (yellowing), unusual smell, or clumping of powder may indicate degradation. Properly stored lactoferrin capsules or powder should maintain consistent appearance throughout their shelf life.

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Scientific References

• Wang B et al. Lactoferrin: structure, function, denaturation and digestion. Critical Reviews in Food Science and Nutrition. 2019