These are the products you should never store in the bathroom: "It's one of the worst places."

The bathroom isn't just where we do our business or wash. It's also where many people keep their cosmetics and even their medications.

But while it may seem like it, it's not the most appropriate place to store some of these things. This is what John Horner , managing director of the luxury bathroom retail chain 34 St John, maintains in statements reported by the Daily Mail .

According to Horner, extreme humidity and temperature fluctuations in bathrooms reduce the shelf life of cosmetics and beauty products. "Many people don't realize that their bathroom is actually one of the worst places to store their cosmetics ," she says.

"Constant changes in humidity and temperature can break down active ingredients and even promote bacterial growth," the expert says.

Her most specific warning concerns sunscreen , as storing it in bathroom cabinets could cause it to lose its protective qualities. "Sunscreen molecules can become unstable when repeatedly exposed to heat and humidity cycles," she says.

"If your sunscreen changes color or smells different , it's time to replace it immediately, regardless of the expiration date," she adds.

"Perfume bottles may look great on bathroom shelves, but fluctuating temperatures and humidity levels cause fragrance compounds to break down much faster ," Horner explains.

Heat and humidity alter the chemical composition of perfumes, causing them to oxidize and smell completely different from what you originally purchased.

Store your fragrances in a cool, dark place, like a drawer in your bedroom. This simple change can extend their shelf life by several months or even years, Horner adds.

"Natural skin care products often contain fewer synthetic preservatives , making them more susceptible to bacterial contamination in humid environments," Horner says.

The expert suggests keeping these items in a bedroom drawer, where the temperature is more stable and humidity levels are much lower than typical bathroom conditions.

"Products with ingredients like vitamin C, retinol, and probiotics break down quickly when exposed to moisture and heat," she adds.

The last product she advises keeping out of the bathroom is makeup, especially powders and items without airtight seals.

"Makeup brushes and sponges stored in the bathroom become breeding grounds for bacteria, which then transfer directly to the skin," she explained. "This can lead to breakouts and infections," she concludes.