Vitamin C is one of the most potent antioxidants available. And we know that antioxidants are vital for helping reverse the oxidative damage that free radicals from the sun and the environment can do to our skin—which leads to the appearance of aging.

Vitamin C is also essential for collagen production, which is necessary to firm and strengthen skin, reduce skin dullness and give us a fresher, brighter complexion. But here’s the caveat with topical vitamin C: it’s a “volatile” ingredient.

“While vitamin C powder has a variety of incredible skin benefits, it’s a very unstable ingredient,” says Kerry De Villiers, Trilogy’s product research and compliance manager. The potency of vitamin C (or ascorbic acid) powder comes from its freshness, she says. “Once exposed to air, light and water, the efficacy of this ingredient begins to deteriorate.” That’s why fresh is best when it comes to vitamin C’s ability to immediately brighten the skin.

Trilogy’s latest skin care collection includes two powerful vitamin C-based products that work together to brighten the skin, and use an ingenious technology that keeps ingredients as fresh as possible. Here’s how they work.

Vitamin C Booster Treatment

The secret of this two-week, daily treatment is the 6% high-potency vitamin C in a unique two-chamber dispensing mechanism—which pops with freshness when the pure ascorbic acid powder is released into an ultra-hydrating hyaluronic acid and botanical oil mixture. That means it stays fresh until you’re ready to start treatment!

“Hyaluronic acid hydrates and helps to improve the appearance of wrinkles, while daisy extract intensifies skin luminosity and helps to further reduce the appearance of age spots and pigmentation,” says Kerry. “We’ve also incorporated our cold-pressed rosehip oil with a minimum essential fatty acid content of 80 percent to restore, hydrate and condition the skin.”

The resulting mixture helps brighten and smooth skin—in fact, 71 percent of women saw an improvement in all-over radiance after the two-week treatment.*

For optimal performance, Trillogy recommends using 3-4 drops to clean face, neck and décolletage, morning and night for two weeks. (Note: While the vitamin C is no longer active after the initial two weeks, your skin can still enjoy the benefits from the botanically enriched hyaluronic acid serum.)

Follow up: Vitamin C Moisturising Lotion

This light hydration lotion can be used in conjunction with the Booster to prolong the complexion-brightening effects.

*Average self-assessment results from 30 women using Trilogy Vitamin C Booster Treatment over two weeks, used twice daily.