The Work Behind Every Bottle

Have you ever bought a Vitamin C serum, loved it the first few weeks, and then a month later realized your skin just... wasn't glowing the way it used to? You didn't imagine that. And it probably wasn't your skin.

Noche Y Dia Vitamin C Serum, glass bottle

Vitamin C is one of the most unstable ingredients in skincare. The moment it's exposed to air and light, it starts to break down, every time you unscrew the cap, every time it sits on a sunny counter. Most serums are formulated in water, which speeds that breakdown up even further.

By week six or eight, the bottle still looks full. Most of what you paid for isn't there anymore.

Why ours is formulated differently

We built our Vitamin C Serum in an oil base instead of water, specifically because oil helps keep Vitamin C stable for longer. It's also why we chose glass over plastic, plastic lets in more light and air over time than glass does. Neither choice makes for a flashier bottle. Both mean the serum you use in month three still works as hard as it did on day one.

What's actually in it

Noche Y Dia Vitamin C Serum styled with ingredients

Rather than one form of Vitamin C, ours blends fast-acting Ascorbic Acid, the most bioavailable form, with oil-soluble Ascorbyl Stearate, so it works quickly and keeps working as it absorbs. Both are carried in bitter orange, lemon, and kiwi seed oils, chosen for their own benefits, not just as filler. Different forms behave differently in a formula, and combining them is part of what keeps this one holding up long after a typical water-based serum would've faded.

Proof, not just our word

Applying Noche Y Dia Vitamin C Serum

Our Vitamin C line was independently clinically tested in Spain, real volunteers, following international clinical research standards, not an in-house claim we made up ourselves. Most skincare brands never put their formulas through anything like that.

The lab work is one kind of proof. Here's what women who've used it for years say, unprompted, in their own words.

"I have been using the C Serum for years and only now seeing some wrinkles, but not very many. I've told anyone who would listen about this serum and have even given them a bottle out of my own stash. You will always find a full bottle (or two) in my house. I don't ever want to run out of this product!"Molly Barrett
"I've had your Vitamin C serum for a while. Love your product."Barbara Wolfson

All of it adds up to the same promise: what you're using on day one is still what you're using on day sixty. Not a serum fading quietly in your bathroom cabinet while you keep applying it out of habit, hoping it's still doing something.

A serum that's still doing its job in month three.

Our Vitamin C Serum, formulated to stay stable and potent from the first day to the last.

Shop the Vitamin C Serum

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