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Vitamin C serums are well-known for brightening your complexion, fading stubborn dark spots, and keeping fine lines at bay. But there's a catch—this powerhouse ingredient isn't exactly stable, and it can turn on you if you're not careful. Curious if your go-to serum is still delivering the goods or if it's time to say goodbye? Here's what you need to know.
Signs your vitamin C serum has gone badThe biggest giveaway is a color change. According to beauty experts, if your serum turns completely yellow, orange, brown, or any shade different from when you first bought it, it's likely oxidized. This is because light and air exposure accelerate oxidation. While it won't harm your skin, an oxidized serum won't offer the potent benefits you're after. Other signs? A funky scent or a grainy texture.
Tips to keep your vitamin C serum fresh longer
(1) Use it up quickly. The sweet spot for most serums is three to four months after opening. Check for a small PAO (period after opening) symbol on the packaging (it looks like an open jar with a number, e.g., 3M for three months).
(2) Choose the right packaging. Serums stored in dark, airtight containers last longer. Look for luxury airless skincare packaging, like opaque bottles or pump dispensers, which protect against light and oxygen.
(2) Store in a cool place. Heat and humidity are your serum's worst enemies. Store it in a dark drawer—or better yet, pop it in the fridge! Not only does this preserve the formula, but applying a chilled serum feels like a mini spa moment.
Best practices for vitamin C enthusiasts
Avoid overstocking: Stick to buying one serum at a time. Fresh is best when it comes to active ingredients.
Expand your skincare arsenal: Pair your Vitamin C with a natural moisturizer for dry skin to lock in hydration or a sensitive skin care product for a gentle touch.
Stay consistent: Using your serum regularly ensures you get the most out of it before it loses potency.