Skip to content

Vitamin C serums, blended fresh the day you order.

Free U.S. Shipping on Orders Over $50

Vitamin C serums, blended fresh the day you order.

Free U.S. Shipping on Orders Over $50

Sign In

Skip to product information
1 of 4

C10 L-Ascorbic Acid Serum

C10 L-Ascorbic Acid Serum

Our Price $19.99 USD
Actual Price  Our Price  $19.99 USD
Sale Sold out
Shipping calculated at checkout.
★★★★★ 4.8 6 reviews

A gentler 10% L-ascorbic acid serum for sensitive skin and vitamin C beginners.

  • Half the strength. An easier introduction to vitamin C.
  • Brightens and evens tone with less risk of stinging
  • Same fresh-blended, hand-dated quality as our C20s
  • Fragrance-free and oil-free
10% L-Ascorbic Acid1 fl oz (30 ml)pH 2.5-3Sensitive skin, beginners
Secure Checkout
Free U.S. Shipping Over $50
30-Day Money-Back
Encrypted Payments
View full details

30-Day Money-Back Guarantee

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.

Reviews

Customer Reviews

Based on 6 reviews
83%
(5)
17%
(1)
0%
(0)
0%
(0)
0%
(0)
J
Janet Bonniwell

It makes my skin feel smoother. Maybe more of an even tone

C
Cindy W
First Try

My first vitamin c serum and my goodness its good, my skin was stunning whilst using this acne marks faded and the overall colour and tone was soo much healthier. I ran out a couple of weeks ago and brought the avalon serum instead which is nice but has no where near the beautiful ,effects of this i'll definitely be buying again soon enough.

K
Kristen P
No Pump!

I would give 5 stars if it had a pump bottle. I like how this is made fresh is water light even lighter than a serum so ok for breakout prone skin or layering with other serums and lotions like I do. I use a very strong over the counter retinol at night (Dermadoctor Poetry in Lotion) for my adult acne and texture (no pimples using the Dermadoctor stuff yay) so 20% vitamin c serum is too irritating for me so this is a good strength

T
Tali J
Great product

Cannot rate this product enough! Nufountain as a company are v helpful and friendly, and their product costs (and postage) are soo good for what you get! I ordered just before Christmas, and the serum lasted me until march, so a good long while. I'd say it took about 6weeks before I noticed any difference, but after that my skin was truly radiant, glowy, soft and just generally amazing! I cut down on foundation drastically as this product made my bare skin flawless! I haven't got round to ordering any more yet, but am missing it so much. My skin is starting to get dull, congested (don't know whether it was the product or the decrease in foundation that improved my skin, but either way I'm not complaining!) and just blah. Save your money on all the expensive vitamin c serums, and treat yourself to this! I got the 10% first as I have sensitive skin, but think I'm going to purchase a 20% one next week now that i know my skin is ok with it.

A
Avey A
I Really Like this Serum!!

I really like this serum. I am an Esthetician and know how important it is to use topical antioxidants (as well as eating them). Vitamin C is a great topical antioxidant and helps as a barrier, also be sure to protect your skin with SPF, daily no matter if it's raining outside. I used another vitamin c serum with feurilic acid 20% and it was too irritating for my skin in particular. My skin is pretty sensitive and this one works great for me. I have oily/combo type and this serum I can tell is made fresh, they also write when they prepared it. It's a clear liquid when you first open it, it's NOT just water as some reviewer said, that made me laugh though haha. You can feel it's not just water because I had tweezed my eyebrows then put some on not thinking and it stung a bit because well, it's vitamin c. By the end of the month of using it, it will turn a slight orange color due to the oxidation from opening the bottle and using it daily. It lasts about a month to two months if I stretch it out. Overall with this it is a great price, great product, I will keep purchasing it. Skinceuticals which by the way is owned by LOREAL..is in my opinion is very overpriced for what you get. They have millions of dollars of marketing and packaging, that's what you're paying for with a lot of brands. RESULTS of THIS: Yes, after using it for some time I see a big improvement in evening my skin tone and texture and helps keep breakouts at bay...of course diet, exercise, drinking plenty of water (alkaline water) genetics, and hormones all play a huge part BUT maintaining a good skin health regimen is imperative :) Great product, thanks.

Best value
Buy 2, get 1 free Add the 3-pack for $39.99, just $13.33 a bottle. You save $19.98.
View the 3-pack

A softer 10% L-ascorbic acid serum for sensitive skin and vitamin C beginners. Same fresh-blended, hand-dated quality as our stronger serums — just an easier place to start.

  • Gentle 10% vitamin C — real results with less tingle
  • Ideal for sensitive skin or your first vitamin C serum
  • Brightens, supports collagen and helps target dark spots over time
  • Fragrance-free, oil-free and fast-absorbing on all skin types

Gentle doesn't mean weakBecause it's blended fresh and hand-dated, even at 10% the vitamin C arrives fully active — freshness makes a lower strength genuinely effective.

Blended fresh to order
Hand-dated bottle
Made in the USA
0★ from 6 reviews
The NuFountain difference

A gentler dose, still fresh and fully active

Starting lower is the smart way to introduce vitamin C — but a low strength that's also gone stale barely does anything. We blend your C10 to order and hand-date it, so a gentle 10% still delivers real, active vitamin C to your skin.

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 C10 Gentle

  • Blended the day your order ships
  • Hand-dated so you see exactly how fresh it is
  • A gentle 10% that's still fully active
  • Short, transparent ingredient list — nothing you don't need
What it does

An easy introduction to vitamin C

All the core benefits of vitamin C, dialed to a strength sensitive skin can live with daily.

Gentle enough for daily use

At 10%, most sensitive and reactive skin can use it every day with little to no tingle.

Brightens & smooths

Helps fade dullness and dark spots for a clearer, more even, more youthful glow.

Supports collagen

Vitamin C helps your skin build collagen, softening the look of fine lines over time.

What's inside

Simple, gentle, transparent

The same clean approach as our stronger serums, at a strength that's kind to sensitive skin.

10%

L-Ascorbic Acid

A gentler dose of the active form of vitamin C — effective for brightening and antioxidant support with less risk of stinging.

+

Glycerin

A soothing humectant that keeps the serum hydrating and comfortable.

C10 L-Ascorbic Acid Serum ingredients

Full ingredient list

Purified Water, 10% L-Ascorbic Acid, Magnesium Sulfate, Glycerin.

pH 2.5Fragrance-freeOil-freeFor sensitive skinspan class="chip">1 fl oz (30 ml)
What to expect

Real results run on consistency

Even a gentle serum rewards consistency. Here's an honest timeline — results vary, and daily sunscreen protects your progress.

Weeks 1–2

Comfortable start

Skin adjusts easily and often already looks a touch brighter and smoother.

Weeks 4–6

Brighter tone

Dullness fades and skin looks clearer with steady daily use.

Weeks 8–12

Ready to level up

Many people graduate to our C20 once their skin is comfortable with daily vitamin C.

How to use

Four gentle steps

1

Cleanse

Start with clean, dry skin.

2

Apply 5–6 drops

Pat gently over the face and neck. Little to no tingle 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.

Perfect for beginners. You can usually use C10 daily right away, but patch test first if your skin is very reactive. Keep the cap tight and store cool and dark — refrigerate unopened bottles. If the serum turns deep amber, it's oxidized and 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 gentle-start favorite

0
☆☆☆☆☆
6 verified reviews

Customer Reviews

Based on 6 reviews
83%
(5)
17%
(1)
0%
(0)
0%
(0)
0%
(0)
J
Janet Bonniwell

It makes my skin feel smoother. Maybe more of an even tone

C
Cindy W
First Try

My first vitamin c serum and my goodness its good, my skin was stunning whilst using this acne marks faded and the overall colour and tone was soo much healthier. I ran out a couple of weeks ago and brought the avalon serum instead which is nice but has no where near the beautiful ,effects of this i'll definitely be buying again soon enough.

K
Kristen P
No Pump!

I would give 5 stars if it had a pump bottle. I like how this is made fresh is water light even lighter than a serum so ok for breakout prone skin or layering with other serums and lotions like I do. I use a very strong over the counter retinol at night (Dermadoctor Poetry in Lotion) for my adult acne and texture (no pimples using the Dermadoctor stuff yay) so 20% vitamin c serum is too irritating for me so this is a good strength

T
Tali J
Great product

Cannot rate this product enough! Nufountain as a company are v helpful and friendly, and their product costs (and postage) are soo good for what you get! I ordered just before Christmas, and the serum lasted me until march, so a good long while. I'd say it took about 6weeks before I noticed any difference, but after that my skin was truly radiant, glowy, soft and just generally amazing! I cut down on foundation drastically as this product made my bare skin flawless! I haven't got round to ordering any more yet, but am missing it so much. My skin is starting to get dull, congested (don't know whether it was the product or the decrease in foundation that improved my skin, but either way I'm not complaining!) and just blah. Save your money on all the expensive vitamin c serums, and treat yourself to this! I got the 10% first as I have sensitive skin, but think I'm going to purchase a 20% one next week now that i know my skin is ok with it.

A
Avey A
I Really Like this Serum!!

I really like this serum. I am an Esthetician and know how important it is to use topical antioxidants (as well as eating them). Vitamin C is a great topical antioxidant and helps as a barrier, also be sure to protect your skin with SPF, daily no matter if it's raining outside. I used another vitamin c serum with feurilic acid 20% and it was too irritating for my skin in particular. My skin is pretty sensitive and this one works great for me. I have oily/combo type and this serum I can tell is made fresh, they also write when they prepared it. It's a clear liquid when you first open it, it's NOT just water as some reviewer said, that made me laugh though haha. You can feel it's not just water because I had tweezed my eyebrows then put some on not thinking and it stung a bit because well, it's vitamin c. By the end of the month of using it, it will turn a slight orange color due to the oxidation from opening the bottle and using it daily. It lasts about a month to two months if I stretch it out. Overall with this it is a great price, great product, I will keep purchasing it. Skinceuticals which by the way is owned by LOREAL..is in my opinion is very overpriced for what you get. They have millions of dollars of marketing and packaging, that's what you're paying for with a lot of brands. RESULTS of THIS: Yes, after using it for some time I see a big improvement in evening my skin tone and texture and helps keep breakouts at bay...of course diet, exercise, drinking plenty of water (alkaline water) genetics, and hormones all play a huge part BUT maintaining a good skin health regimen is imperative :) Great product, thanks.

Good to know

Questions, answered

Who is C10 best for?
Anyone with sensitive or reactive skin, or anyone brand-new to vitamin C. The lower 10% strength gives you real brightening and antioxidant benefits with much less chance of tingling or irritation.
Should I start with C10 or go straight to C20?
If your skin is sensitive or you've never used vitamin C, start with C10. Once your skin is comfortable using it daily, you can graduate to our 20% C20 for a stronger dose.
Will I still see results at 10%?
Yes — because it's blended fresh and fully active, a gentle 10% still brightens, supports collagen and helps target dark spots. It just works a little more gradually than 20%.
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.

Choose your serum ↑
Back to top
Home Shop
Cart
Log in
×