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Tetrahexyldecyl Ascorbate (Vitamin C)

Vitamin C derivative

Tetrahexyldecyl Ascorbate (Vitamin C)

Brightening, firming, antioxidant

Key Benefits

  • Provides antioxidant support
  • Promotes brighter-looking tone
  • Helps visibly even pigmentation
  • Supports firmer-looking skin

How It Works

Its lipophilic structure allows THD Ascorbate to be incorporated into oil phases and can improve formulation flexibility compared with L-ascorbic acid. Within skin it is intended to act as a precursor to active ascorbic acid.

Stabilization matters: research shows THD Ascorbate can still degrade under oxidative stress, so the antioxidant system and packaging influence the quality of the finished formula.

Ingredient Details

INCI Name: Tetrahexyldecyl Ascorbate

Ingredient Type: Oil-soluble vitamin C derivative

Best For

Dullness · Uneven tone · Antioxidant routines · Visible signs of photoaging

Research

View Ingredient Research →

What It Is

Tetrahexyldecyl Ascorbate, sometimes abbreviated THD Ascorbate or THDA, is a lipophilic ester derived from ascorbic acid. Its oil solubility distinguishes it from pure L-ascorbic acid, which is water soluble and requires different formulation conditions.

It should not be assumed to behave identically to pure vitamin C in every product. Conversion, stability, and delivery all affect performance.

What It Does

THD Ascorbate supports a brighter, more even-looking complexion and helps defend against visible oxidative stress. It is also used in routines focused on fine lines, firmness, and overall radiance.

Clinical studies of formulas containing THD Ascorbate have reported improvements in pigmentation and visible photoaging, but some studies combine it with other actives, so results belong to the finished formula rather than this ingredient alone.

Tetrahexyldecyl Ascorbate (Vitamin C) FAQs

Common questions about this ingredient in skincare.

Is Tetrahexyldecyl Ascorbate pure vitamin C?
No. It is an oil-soluble derivative of ascorbic acid and is designed to function as a vitamin C precursor.
How is THD Ascorbate different from L-ascorbic acid?
THD Ascorbate is oil soluble and can be formulated under different conditions; L-ascorbic acid is water soluble and behaves differently in formulas.
What does THD Ascorbate do for skin?
It provides antioxidant support and helps improve the look of dullness, uneven tone, pigmentation, and fine lines.
Can THD Ascorbate be used every day?
Many formulas are intended for daily use. Follow the directions for the finished product and introduce it gradually if your skin is reactive.
Can THD Ascorbate be used with niacinamide?
Yes. The two ingredients can generally be used together in a well-formulated routine.
Does THD Ascorbate replace sunscreen?
No. Antioxidants complement daytime protection but do not replace broad-spectrum sunscreen.
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Products Featuring Tetrahexyldecyl Ascorbate (Vitamin C)

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