• Orange skincare serum container with 'skinfix' branding on a white background
  • White cream serum swatch on a white background
  • Orange container of Skinfix Vitamin C with a small amount of cream being squeezed out, on a white background.
  • Close-up of a person applying cream to their cheek with on-image clinical claims about brighter-looking skin, reduced wrinkles, and gentle results.
  • Before and after comparison of dark spots and wrinkles on skin with text about clinical validation.
  • Before and after comparison of vitamin c serum with text about product effectiveness.
  • Before and after comparison of a face with blemishes, showing improvement over 4 weeks after using vitamin c serum.
  • Skinfix AM and PM skincare routine featuring Foaming Oil Cleanser, Brighten + Firm Vitamin C Serum, and Triple Lipid-Peptide Cream.
  • Ingredients overview for Skinfix Brighten + Firm Vitamin C Serum highlighting THD ascorbate, peptide solutions, glycerin, and antioxidant blend.
  • Diagram comparing oil-soluble vitamin C used in Skinfix Brighten + Firm serum with water-soluble vitamin C, illustrating differences in skin penetration.
  • Side-by-side image of current and new Skinfix Brighten + Firm 15% Vitamin C Serum packaging, noting a new look with the same clinical formula.
New

Brighten + Firm 15% Vitamin C Serum

Visibly fade dark spots and lines in just 1 month with this breakthrough formula, which pairs THD Ascorbate—a gentle yet potent form of vitamin C—with two advanced peptides to brighten better and firm faster.

Benefits

  • Blue hand drawn icon that represents brightens
    Brightens
  • Blue hand drawn icon that represents firms
    Firms
  • Hydrates
Size

Get 2 free samples with all orders

Free shipping on orders over $50

Brighten + Firm 15% Vitamin C Serum

  • Orange skincare serum container with 'skinfix' branding on a white background
  • White cream serum swatch on a white background
  • Orange container of Skinfix Vitamin C with a small amount of cream being squeezed out, on a white background.
  • Close-up of a person applying cream to their cheek with on-image clinical claims about brighter-looking skin, reduced wrinkles, and gentle results.
  • Before and after comparison of dark spots and wrinkles on skin with text about clinical validation.
  • Before and after comparison of vitamin c serum with text about product effectiveness.
  • Before and after comparison of a face with blemishes, showing improvement over 4 weeks after using vitamin c serum.
  • Skinfix AM and PM skincare routine featuring Foaming Oil Cleanser, Brighten + Firm Vitamin C Serum, and Triple Lipid-Peptide Cream.
  • Ingredients overview for Skinfix Brighten + Firm Vitamin C Serum highlighting THD ascorbate, peptide solutions, glycerin, and antioxidant blend.
  • Diagram comparing oil-soluble vitamin C used in Skinfix Brighten + Firm serum with water-soluble vitamin C, illustrating differences in skin penetration.
  • Side-by-side image of current and new Skinfix Brighten + Firm 15% Vitamin C Serum packaging, noting a new look with the same clinical formula.

1 oz

Brighter, firmer-looking skin in just 1 month—without irritation.

Brighter, firmer-looking skin in just 1 month—without irritation.

Woman looking into camera applying Skinfix Brighten + Firm Vitamin C Serum to right cheek.
  • Do No Harm
    Details
    • Accepted by the National Eczema Association
    • Suitable for Sensitive Skin
    • Clinically Tested
    • Dermatologist Tested
    • Non-Comedogenic
    • Hypoallergenic
    • Vegan
    • Cruelty-Free
  • Do No Harm
    Details
    • Accepted by the National Eczema Association
    • Suitable for Sensitive Skin
    • Clinically Tested
    • Dermatologist Tested
    • Non-Comedogenic
    • Hypoallergenic
    • Vegan
    • Cruelty-Free
  • Ingredients
    15% Tetrahexyldecyl Ascorbate

    An ultra-potent and stable form of vitamin C that visibly brightens + firms

    2% Tetrapeptide Solution

    Biomimetic peptides that visibly reduce dark spots and discoloration

    2% PGA Peptide Solution

    Peptides that hold up to 5000x their weight in water to restore bounce

    1% AOX Blend

    Ferulic acid, vitamin E, and turmeric polyphenols protect formula potency

    5% Glycerin

    A water-attracting humectant that hydrates and helps skin retain moisture

    Free From

    × fragrance
    × essential oils
    × silicones
    × phthalates
    × microplastics
    × parabens
    × sulfates
    × PEGs
    × gluten

  • Ingredients
    15% Tetrahexyldecyl Ascorbate

    An ultra-potent and stable form of vitamin C that visibly brightens + firms

    2% Tetrapeptide Solution

    Biomimetic peptides that visibly reduce dark spots and discoloration

    2% PGA Peptide Solution

    Peptides that hold up to 5000x their weight in water to restore bounce

    1% AOX Blend

    Ferulic acid, vitamin E, and turmeric polyphenols protect formula potency

    5% Glycerin

    A water-attracting humectant that hydrates and helps skin retain moisture

    Free From

    × fragrance
    × essential oils
    × silicones
    × phthalates
    × microplastics
    × parabens
    × sulfates
    × PEGs
    × gluten

  • How to Use
    Day + Night
    • Apply 1-2 pumps to clean, dry skin after cleansing. Follow with your moisturizer and sun protection
    • Safe to use twice a day, every day–even when first starting out

    Good to Know

    Even though Brighten + Firm Vitamin C serum is NEA-accepted, we don't recommend using it during an active eczema flare. Wait until your skin has calmed down before resuming use.

  • How to Use
    Day + Night
    • Apply 1-2 pumps to clean, dry skin after cleansing. Follow with your moisturizer and sun protection
    • Safe to use twice a day, every day–even when first starting out

    Good to Know

    Even though Brighten + Firm Vitamin C serum is NEA-accepted, we don't recommend using it during an active eczema flare. Wait until your skin has calmed down before resuming use.

  • Awards
    2026

    NewBeauty Beauty Awards - Best Vitamin C Serum for Sensitive Skin

  • Awards
    2026

    NewBeauty Beauty Awards - Best Vitamin C Serum for Sensitive Skin

See in Action
  • Before Close-up of a person's face with wrinkles and skin texture highlighted.
    After Close-up of a person's face with improved texture and firmer skin
  • Before Close-up of a person’s cheek with visible dark spots and uneven skin tone highlighted by a dotted circle.
    After Close-up of a person's eye and forehead with visibly improved skin texture.
  • Before Close-up of a person's face with visible blemishes on the skin.
    After Close-up of a person's face with visibly less blemishes on the skin and brighter skin.
  • Before Close-up of a person's face with circles highlighting skin texture and dark spots.
    After Close-up of a person's face with visibly less texture and brighter skin

Clinical Results

Clinically proven to reduce the look of dark spots and wrinkles, with results that keep improving over time.
Results of an 8 week clinical trial with 32 participants, analyzed with ImagePro® software.

  • 100% saw their fine lines and wrinkles improved, by an average of 22% after one month and 32% after two

    Results of an 8 week clinical trial with 32 participants, analyzed with ImagePro® software.

  • 100% said it was gentle on skin—even with twice-daily use over two months

    Results of an 8-week consumer perception study with 32 participants, after 8 weeks.

  • 97% saw brighter and more naturally radiant skin, with no new discoloration over two months

    Results of an 8-week consumer perception study with 32 participants, after 8 weeks.

  • 91% said it delivered better results than competing serums

    Results of an 8-week consumer perception study with 32 participants, after 8 weeks.

Environmental

Reducing our impact is important to us

We partnered with Bluebird to complete a full Life Cycle Analysis on the carbon and waste impact of this product.

Reducing our impact is important to us

We partnered with Bluebird to complete a full Life Cycle Analysis on the carbon and waste impact of this product.

Production

Made in North America with ethical labor practices

Box

100% FSC certified paper made with 30% recycled fibres and plant-based inks

Partners
Learn more about our sustainability commitments
  • Orange rectangular object with a textured top on a white background
    Pump

    Check locally for recyclability of all plastic pumps or place in PACT collective bin here

    Packaging Facts

    100% plastic -- no metal spring. 90% PP, 10% PE

  • Orange rectangular object on transparent background
    Cap

    Place in recycle bin

    Packaging Facts

    50% PCR PP

  • Box

    Place in recycle bin

    Packaging Facts

    100% FSC certified paper made with 30% recycled fibres and plant-based inks
Orange skincare serum bottle with 'skinfix' branding on a white background

FAQ

  • What skin types is this serum suitable for?

    This formula is safe for all skin types—dry, oily, sensitive, and everything in between. It's non-comedogenic, which means it shouldn't clog pores. And it's even accepted by the National Eczema Association, which means it's been vetted for sensitive, eczema-prone skin.

  • Can I combine vitamin C with other active ingredients (retinol, AHAs, niacinamide, etc.)?

    You can—but you might not need to. Each pump delivers vitamin C, peptides, humectants, and antioxidants—doing the work of several serums in one. If you still want to use retinol or acids, alternate: vitamin C in the morning, those at night.

  • Is this vitamin C serum OK for daily use long-term, or should I cycle it?

    You can absolutely use it daily. It's made to be gentle enough for consistent, long-term use—even if you're sensitive.

  • Is this safe to use during pregnancy and breastfeeding?

    Vitamin C is generally considered safe to use during pregnancy and breastfeeding, but if you have specific concerns, it's always a good idea to check with your doctor.

Overall rating: 4.5555553 / 5 from 243 reviews.

AI Generated Review Summary

This vitamin C serum visibly fades dark spots and lines in just one month. Customers appreciate its lightweight texture, excellent absorption, and the radiant, healthy glow it provides. The product is generally well-received for its brightening and firming effects, though some feedback on scent is mixed.

Summary topics

  • Product Texture (35%): A substantial number of customers brought up the lightweight and non-greasy texture of the product.
  • Absorption (25%): A significant number of customers remarked that the product absorbs well and feels light on the skin.
  • Skin Appearance (40%): Many customers loved how the product made their skin look healthier, more awake, and more youthful.
  • Skin Glow (40%): Many customers stated that this product gives their skin a radiant, healthy glow and keeps it hydrated.
  • Dark Spots Fading (25%): The feedback is varied, but this serum helps fade dark spots and lines in just 1 month.

Review topics: ["size","fragrance","absorbs","issues","irritation","results","improvement","scent","feels","ingredients","texture","works","skin","packaging","spots","lines","looks","bottle","glow","use","formula","face","consistency","difference","complexion","hydration","redness","serum","appearance","residue"].

Review highlights

  • "The texture is lightweight and non-greasy, making it perfect for daily use even for sensitive skin." — Dayana D.
  • "No overwhelming scents, and feels nice on my skin." — Savannah
  • "From the first few uses, the skin looks noticeably brighter, smoother, and more energized without irritation." — Dayana D.

Reviews

Goodbye dark spots, hello glow!

"This Vitamin C serum is a total game-changer. I've struggled with stubborn dark spots for a while, and this formula has visibly faded them faster than anything else I've tried. Plus, the amount of radiance it brings to my complexion is insane. My skin looks so bright, even-toned, and naturally glowing every single day!"

— Sophie (5/5)

My new favorite Vitamin C

"I have ultra-sensitive skin and hormonal acne, so I’m very picky about what I use on my face. Skinfix Vitamin C gives me the glow I was looking for without irritation, and my dermatologist approved it too! 🤍 A true skincare favorite."

— Sofia O. (5/5)

I have sensitive skin, with

"I have sensitive skin, with Rosacea. I am happy to have finally found a vitamin C that is gentle and not sticky on my skin. Nice product that absorbs well. Very faint smell, but not unpleasant. However, the dispenser I received is a problem. One full pump is way too much. A half pump is too little. Hard to control the amount dispensed."

— Wendy m. (4/5)

I am 53 years old

"I am 53 years old and have an age spot on my check from sun damage. I was thinking about making a dermatologist appointment to get help with lightening the spot but in the meantime I starting using the Skinfix c serum. Within days I saw a noticeable difference! I am every impressed with this serum and would highly recommend it."

— Janette W. (5/5)

I typically dislike using vitamin

"I typically dislike using vitamin c products because they are irritating- not the case with this one. I’ve only been using it for a few weeks but so far, so good:"

— Twyla b. (5/5)

This stuff is so good

"This stuff is so good that my kids want to know what I'm using on my skin to make it look so nice. . . . That tells me everything!!!! And besides my skin looking better it feels so soft too."

— Kathryn D. (5/5)

So far so good! I

"So far so good! I am noticing a small difference. Plan to keep using. Nothing dramatic over night, but heading in good direction with my other products."

— Maggie S. (5/5)

I’ve been using this Vitamin

"I’ve been using this Vitamin C serum for a few weeks and I’m really happy with the results. The texture is lightweight, absorbs quickly, and doesn’t leave my skin feeling sticky."

— Anastasiya S. (5/5)

Love Love Love

"Love this Vitamin C Serum!! I have Extremely sensitive skin and typically I have an adjustment period where I react before my skin adjusts, not with this. It instantly hydrated my skin, I have noticed dark/red spots lightening overtime. I have been using this for 4 months now and ran out recently, I can't wait to get my order."

— Laura (5/5)

After a few weeks I

"After a few weeks I noticed my skin adjusted and definitely seems smoother and more uniformly coloured."

— Greer M. (5/5)

Q&A

Is this product good for 85 yo dry skin
Hi Irene, Vitamin C is a powerhouse antioxidant that helps brighten dullness, fade visible dark spots, and firm the look of skin over time. It also helps defend against free radicals that can make spots look darker and lines look more pronounced—so you're protecting while you treat. We hope this helps!
Can I pair this with Azelaic acid in the morning? I currently use tretinoin 0.05% at night so I can't pair anything with tret at night due to irritation. If I can pair azelaic acid (15% in my case), should I use this serum first and then the azlaic acid? Or should I use the acid first, then this vitamin c serum?
Hi Prithvi, Each pump delivers vitamin C, peptides, humectants, and antioxidants—doing the work of several serums in one. You could alternate days - one day Vit C then next day Azelaic acid? But please confirm with your prescribing doctor to ensure these ingredients are right for you. We do not recommend layering these actives at the same time. Thanks!
Can I apply this serum to the under eye area? In currently avoiding that area and just going up to and around the orbital bone
Hi Prithvi, Thank you for reaching out and for your question. This serum isn’t made for the delicate eye area, so keep it on the orbital bone only (not the lids or too close to the lash line). If you're looking for eye-specific benefits, we recommend trying our Triple Lipid Eye Treatment. Thanks!
Can I use the Brighten + Firm 15% Vitamin C Serum with the Mad About Skincare copper peptide serum? Thanks.
Hi Melissa, You can—but you might not need to. Each pump delivers vitamin C, peptides, humectants, and antioxidants—doing the work of several serums in one. If you still want to use retinol or acids, alternate: vitamin C in the morning, those at night.
Would the vit c need to be refrigerated
Hi Gale, We don't recommend putting Brighten + Firm in the fridge. Storing it in a cool, dark place is enough to help prolong the formula’s potency—especially if you live in a warm or humid climate.
Can I use vitamin c serum with Exo Ecotin baume
Hi Ruthann, We recommend alternating the time of day you use them: vitamin C in the morning to protect and brighten, and Exo Baume at night to support skin renewal. Both formulas are packed full of high-impact ingredients, so you probably don't need to layer them to see results. But if you want to, that's safe, too!
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