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View compareC20 L-Ascorbic Acid Serum
C20 L-Ascorbic Acid Serum
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$22.99 USD
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Our Price
$22.99 USD
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per
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★★★★★
4.8
40 reviews
Straight 20% L-ascorbic acid in a simple four-ingredient base. Vitamin C for purists.
- Brightens dullness and helps target dark spots over time
- Antioxidant defense against daily UV and pollution stress
- Just four ingredients. Nothing you do not need.
- Fragrance-free and oil-free
20% L-Ascorbic Acid1 fl oz (30 ml)pH 2.5-3Normal to resilient skin
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If a NuFountain serum isn't right for you, contact us within 30 days of delivery and we'll refund you in full. You don't need to return the bottle.
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The one that started it all: pure 20% L-ascorbic acid and almost nothing else. If you want the most-studied form of vitamin C at full strength, without fragrance or fillers, this is the purist's serum.
- 20% L-ascorbic acid — the gold-standard, active form of vitamin C
- Just four ingredients: no fragrance, oils or unnecessary extras
- Brightens, supports collagen and defends against daily free-radical stress
- Lightweight, oil-free and fast-absorbing on all skin types
Potency you can datePure L-ascorbic acid is powerful but fragile. Yours is blended the day it ships and hand-dated, so it's working at full strength.
Blended fresh to order
Hand-dated bottle
Made in the USA
0★ from 40 reviews
The NuFountain difference
Pure vitamin C is only as good as it is fresh
20% L-ascorbic acid is the most effective form of vitamin C — and also the fastest to break down once mixed. A pre-made bottle that has sat on a shelf for months has already lost some of its punch. We blend yours to order so purity actually means potency.
Typical shelf serum
- Mixed weeks or months before you buy it
- No way to know how old the vitamin C really is
- Potency quietly drops as it oxidizes
- Often padded with fillers and fragrance
NuFountain C20 Original
- Blended the day your order ships
- Hand-dated so you see exactly how fresh it is
- A true 20% dose, not a faded one
- Short, transparent ingredient list — nothing you don't need
What it does
Three benefits, zero clutter
A minimalist formula that does the core work of vitamin C — nothing added just to lengthen the label.
Brightens & evens tone
Helps target dark spots, sun marks and dullness for a clearer, more radiant complexion over time.
Supports collagen
Vitamin C is essential to your skin's own collagen production, helping keep skin looking firm and smooth.
Daily antioxidant
Helps neutralize free radicals from sun and pollution that would otherwise speed visible aging.
What's inside
Two actives. That's the point.
No fragrance, no oils, no long filler list — the cleanest way to give your skin a full dose of vitamin C.
20%
L-Ascorbic Acid
The pure, active form of vitamin C with the deepest research behind brightening, firmness and antioxidant protection.
+
Glycerin
A gentle humectant that keeps the high-strength formula comfortable and non-drying.
Full ingredient list
Purified Water, 20% L-Ascorbic Acid, Magnesium Sulfate, Glycerin.
What to expect
Real results run on consistency
Pure vitamin C rewards consistency. Here's an honest timeline — results vary, and daily sunscreen protects the progress.
Weeks 1–2
First glow
Skin often looks brighter and smoother as it adjusts to daily vitamin C.
Weeks 4–6
Clearer tone
Dullness fades and skin tends to look more even and awake.
Weeks 8–12
Firmer, brighter
The window where dark spots and fine lines typically show the most visible change.
How to use
Four steps, morning or night
1
Cleanse
Start with clean, dry skin.
2
Apply 5–6 drops
Pat gently over the face and neck. A mild, warm tingle is normal at this strength.
3
Let it absorb
Give it a minute to dry before your next step.
4
Moisturize + SPF
Follow with moisturizer, and always sunscreen in the morning.
New to vitamin C? Start every other day and build up. Patch test first if your skin is sensitive. Keep the cap tight and store in a cool, dark place — refrigerate unopened bottles. If the serum turns deep amber, it has oxidized and it's time for a fresh one.
Protect your results
Vitamin C works best with daily sunscreen
We don't sell sunscreen — so this isn't an upsell. It's the single most important thing you can do to protect what your serum is working toward, and it's worth getting right.
Without daily SPF
- UV light breaks vitamin C down and undoes your brightening
- New dark spots and sun damage keep forming
- Collagen breakdown speeds up, so fine lines deepen
- Your serum is left fighting an uphill battle
Vitamin C + daily SPF
- Locks in and protects your brightening progress
- Helps stop new dark spots before they start
- Guards the collagen your serum is helping build
- The two work together for visibly better results
What to look for in a sunscreen
Broad-spectrum
Look for the words “broad-spectrum” — it protects against both UVA (aging) and UVB (burning) rays.
SPF 30 or higher
SPF 30 blocks about 97% of UVB. Go higher if you're outdoors a lot — just don't drop below 30.
Every single morning
Apply as the last step of your morning routine, over your serum. Reapply every two hours in direct sun.
A texture you'll wear
Mineral (zinc oxide, titanium dioxide) or a modern chemical filter — pick one that feels good so you use it daily.
Reviews
The purist favorite
0
☆☆☆☆☆
40 verified reviewsGood to know
Questions, answered
Why only four ingredients?
Because pure L-ascorbic acid is what does the work. We leave out fragrance, oils and fillers so you get a clean, high-strength dose of vitamin C and nothing your skin doesn't need.
Should I choose C20 Original or C20 Ferulic?
Choose Original if you want the simplest, purest vitamin C. Choose Ferulic if you'd like added antioxidant support from ferulic acid plus more hydration from hyaluronic acid. Both use the same 20% L-ascorbic acid.
Will 20% be too strong for me?
Most skin adjusts well if you ease in — start every other day and build up. If you're sensitive or new to vitamin C, our C10 (10%) or tingle-free C15 MAP are gentler starting points.
How should I store it, and how long does it last?
Keep the cap closed and store in a cool, dark spot; refrigerate unopened bottles to extend freshness. Once opened, use it within about three months. A deep amber color is your signal it has oxidized and it's time for a fresh bottle.
What if it doesn't work for me?
You're covered by our 30-day money-back guarantee — no need to return the bottle. If you're not happy, contact us for a full refund.
Zero risk
Try it for real. If it's not for you, we'll refund you.
We stand behind every fresh-blended bottle with a 30-day money-back guarantee — no returns required. That's how confident we are in what "fresh" does for your skin.
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