Nutritionists warn that desiccant packets, cotton, and plastic sheets should be discarded immediately after opening supplement bottles, as they become moisture reservoirs in humid conditions and cause supplements to deteriorate faster rathe
Nutritionists warn: discard these 3 items immediately after opening supplement bottles, keeping them only increases moisture absorption, with guidance on proper storage after opening.
Many people habitually keep desiccant packets, cotton, and plastic sheets from inside supplement bottles until the product is finished, believing this better prevents moisture damage. However, experts warn this common misconception actually causes supplements to deteriorate faster.
Nutritionist Shui Shuo Jia, who runs the page "The Multi-faceted Life of Nutritionist Shui Shuo Jia," says she recently learned this information herself and felt it was important to share. She explains that desiccant packets, cotton, and plastic sheets primarily serve to prevent damage from impacts and absorb moisture within the packaging "before opening." However, once the bottle is opened, humid air from outside—especially in humid climates like Taiwan—immediately enters the bottle, and the desiccant continuously absorbs moisture from the external air.
"Once the desiccant becomes fully saturated and remains in the bottle, it can become a moisture reservoir instead, causing the supplement to absorb moisture, change color, or clump easily, affecting product quality," she explains.
Nutritionists warn that when desiccant packets shift from moisture-prevention devices to "moisture-storage sources," the nutritional value consumers intended to gain may decrease accordingly.
Nutritionists recommend "3 storage steps after opening a bottle":
1. Discard all materials inside the bottle immediately after opening—whether desiccant packets, cotton, or plastic sheets. Once you open the bottle, these materials' purpose is complete. "Don't hesitate; let them finish their job and be removed."
2. Close the bottle cap immediately after use, especially in humid conditions. Minimize the time the supplement stays exposed to air, and don't leave the cap open for extended periods.
3. Consume the supplement within 3 months of opening. The expiration dates on labels typically assume unopened conditions, so after opening, consume regularly and finish quickly to maintain optimal quality.
Shui Shuo Jia emphasizes that consumers buy supplements to maintain health, so proper storage is equally important to ensure the nutritional value isn't wasted.
Additionally, Taiwan's Food and Drug Administration explains that cotton inside bottles fills empty space and prevents medication from breaking during transport, while desiccant packets absorb trace moisture that may seep past the bottle cap to maintain medication quality and safety during its shelf life.
Therefore, after opening the bottle, both cotton and desiccant packets should be removed immediately to prevent these materials from absorbing and accumulating moisture, which would accelerate deterioration of the medication or supplement.