We’ve tried numerous Vitamin C serums, from pricey $200 for tiny bottles ( cough, cough, SkinCeuticals) to drugstore brands, and have learned a few things along the way; the more expensive brands contain higher concentrations of Ferulic Acid and a delivery system that keeps the serum from going bad.
That’s the problem with most Vitamin C you see; oxygen and sunlight degrade serum so quickly. That’s why it changes color and smell, at which point you have to reluctantly toss it. Some of the best ones are airtight pumps or ampoules ( you crack open a fresh one every time.)
Why did you need to add Vitamin C to your skincare system anyway? It has multiple advantages; it helps fade the appearance of dark spots, sun damage, uneven skin texture, and dullness. We use it specifically for hyperpigmentation (too many years suntanning when we were young.)
So we were thrilled to discover the gopure Vitamin C serum which we received from the company to review and only costs $18 a bottle. Within days our complexion was more even and some of the dark spots have faded. Use 3-4 drops every morning and night and wait at least 5 minutes before applying a moisturizer.
Even if the Ferulic Acid doesn’t keep the Vitamin C stable until we reach the very last drop, we can afford to just buy another one.