How should I store these single-use ampoules to maintain the serum's effectiveness?

Since these are single-use 2 ml ampoules, storage conditions matter primarily before the seal is broken. Keep the unopened ampoules in a cool, dry place away from direct sunlight and extreme temperature fluctuations. Heat and UV light can degrade sensitive cosmetic ingredients like soluble collagen and panthenol, potentially reducing their ability to bind moisture and support skin elasticity. Avoid storing them in a humid bathroom environment if possible, as consistent humidity changes can sometimes affect the integrity of the glass or seal over long periods. Once you open an ampoule, the formula is exposed to air and potential contamination, so it must be applied immediately. Do not save the remaining serum for later use, as the single-use format is designed to ensure hygiene and potency for that specific application session.