Heat and light are the main risks
Store products in a cool, dry place away from direct sun, windows and heat-producing appliances. A bathroom shelf may be humid, while a car or beach bag can overheat quickly. Keep lids closed and avoid touching droppers to the skin.
Follow the label first: some formulas have specific temperature requirements. A refrigerator is not automatically safer and can damage texture or stability if cold storage is not recommended.
Products that need extra attention
Vitamin C, retinoids and other light-sensitive actives benefit from opaque, well-closed packaging and stable room conditions. Sunscreen should not be left in a hot car or direct sun; replace it if the packaging changes, separates unusually or passes its expiry or period-after-opening limit.
Pumps and tubes usually reduce air and finger contact compared with open jars.
Travel and delivery
During travel, use a shaded insulated pouch without direct contact with ice. After delivery on a very hot day, bring the parcel indoors promptly and inspect packaging. When appearance, smell or texture has changed unexpectedly, pause use and ask the retailer or manufacturer.
Related products and collections
This article provides general information and does not replace individual medical advice or the instructions of your treating clinician.