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Serum Fifteen

Serum Fifteen

Serum Fifteen was formulated with pure L-Ascorbic Acid and Hyaluronic acid to provide advanced antioxidant properties to diminish the appearance of fine lines and wrinkles and correct the appearance of uneven skin tone.

 

Size

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How to Use

Apply a few drops to face, neck, and chest after cleansing, then gently massage until fully absorbed.

Benefits

Provides antioxidant protection while improving the look of fine lines, uneven tone, and photodamage, ideal for sensitive skin or first-time Vitamin C users.

Clinical Result

Participants: 27 females and 3 males, 36-59 years old

• 100% experienced improved elasticity
• 100% experienced diminished fine lines
• 100% experienced diminished crow’s feet
• 97% experienced faded age and dark spots
• 97% experienced diminished forehead wrinkles
• 100% experienced more even skin tone and less dullness

No adverse reactions reported during the 8-week test period.

Ingredients

Water, Sodium Hyaluronate, L-Ascorbic Acid, Zinc Sulfate, Bioflavonoids, Phenoxyethanol.

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Ingredients Clinical Studies Comparison Faq Reviews
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  • The BEST and only Vitamin C serum I would apply daily that doesn't hurt my wallet or smell nasty.

    Lila

    Verified Customer
Backed by Science

Gentle Antioxidant Protection

Formulated with 15% pure Vitamin C, hyaluronic acid, and zinc sulfate, Serum Fifteen provides powerful antioxidant benefits with a gentler concentration designed for sensitive skin or those new to Vitamin C.

Full Ingredients List
Water, Sodium Hyaluronate, L-Ascorbic Acid, Zinc Sulfate, Bioflavonoids, Phenoxyethanol.

  • Vitamin C (L-Ascorbic Acid) 15%

    A stabilized form of Vitamin C that helps reduce the look of fine lines, wrinkles, and uneven tone while protecting skin from environmental stressors.

    Benefits

    Brightens, evens tone, smooths, protects

  • Hyaluronic Acid

    A powerful hydrator that draws and locks in moisture, helping skin stay plump, soft, and refreshed.

    Benefits

    Hydrates, plumps, smooths, softens

  • Zinc Sulfate

    A mineral complex that helps calm and balance skin, supporting a healthy-looking complexion.

    Benefits

    Soothes, calms, balances, refines

Full Ingredients List
Water, Sodium Hyaluronate, L-Ascorbic Acid, Zinc Sulfate, Bioflavonoids, Phenoxyethanol.
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Ingredients
Water, Sodium Hyaluronate, L-Ascorbic Acid, Zinc Sulfate, Bioflavonoids, Phenoxyethanol.

  • My breakouts have calmed down, my skin looks and feels smoother, and my skin no longer looks dull. Serum Fifteen has become my go-to product and I wholeheartedly recommend it!

    – Christine C

    Verified Customer

How To Use

  • How To Use

    Apply a few drops to face, neck, and chest after cleansing, then gently massage until fully absorbed.

  • When To Use

    Use daily, morning and/or night. Ideal for introducing Vitamin C into your routine or for those with sensitive skin.

  • Texture

    Lightweight serum that absorbs quickly without residue.

Clinically tested

What The Studies Say

  • Subject Scale 30 subjects
  • Sex 27 females and 3 males
  • Age 36-59 years old
  • Region Tested Face

No adverse reactions reported during the 8-week test period.

The difference is clear

Better Ingredients. Better Results.

    • Clinical grade actives
    • Science-backed formulas
    • No fluff, just results
    • Minimal, proven ingredients
  • OTHER BRANDS
    • Generic extracts
    • Trendy ingredients
    • Marketing over efficacy
    • Overloaded formulations

Skin-First Formulas

Backed By Science, Not Hype

When I first stabilized vitamin C in liquid form in 1995, the world believed it was impossible. That breakthrough not only transformed skincare, it became the foundation on which Phyto-C was built — a company that grew from my small lab in New Jersey to serving more than 35 countries worldwide.

From the beginning, my mission has been clear: to create formulas rooted in science, powered by nature, and uncompromising in their integrity. Each product is backed by decades of clinical research, crafted with medical-grade ingredients, and made in fresh micro-batches to ensure purity and potency.

Today, my son, Dr. Eddie Omar, carries this legacy forward. He leads Phyto-C with the same values I began with — an unwavering dedication to science, innovation, and results that endure.

– Dr. Mostafa Omar
Phyto-C Founder and Inventor of Stabilized Topical Vitamin C

    Still Curious?

    Frequently Asked Questions

    Is Serum Fifteen suitable for sensitive skin?

    Yes, it’s designed for those with sensitive skin or those new to Vitamin C serums.

    How does Serum Fifteen differ from Serum Twenty?

    Serum Fifteen contains a lower concentration of Vitamin C, making it gentler while still delivering strong antioxidant benefits.

    Can I use Serum Fifteen daily?

    Yes, it’s gentle enough for daily use, morning and night.

    Can I layer Serum Fifteen with other serums?

    Yes, apply it before hydrating serums and moisturizers for best absorption.

    Can I use Serum Fifteen with retinol?

    Yes, but use Vitamin C in the morning and retinol in the evening to avoid potential irritation.

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