Researched by Helena DeMaria-Williams
Formula IngredientAntioxidantTetrahexyldecyl Ascorbate
INCI: Tetrahexyldecyl Ascorbate
Tetrahexyldecyl ascorbate (THDA) is a stable, oil-soluble ester form of vitamin C that penetrates the skin more effectively than water-soluble ascorbic acid, thanks to its lipophilic structure. Once absorbed, it converts to active L-ascorbic acid within the skin layers, delivering antioxidant protection, collagen synthesis support, and melanin-inhibiting effects. It was developed to overcome the instability and oxidation issues associated with traditional vitamin C (ascorbic acid).
Category
Antioxidant
Irritation Risk
Low
Skin Types
all skin types, sensitive, acne-prone, hyperpigmentation, dull skin, anti-ageing concerns, dry, combination
What does this do in a formula?
antioxidant protection, brightening, hyperpigmentation reduction, collagen synthesis, anti-ageing, skin tone evening, UV damage repair
Is Tetrahexyldecyl Ascorbate safe? Key considerations
Can Tetrahexyldecyl Ascorbate cause irritation?
Low RiskSignificantly less irritating than ascorbic acid due to its oil-soluble, esterified structure. Considered mild and generally well tolerated by sensitive skin. No EU CosIng Annex II or III restrictions apply. Some individuals with very sensitive skin may experience mild irritation; patch testing is advised.
Does Tetrahexyldecyl Ascorbate increase sun sensitivity?
Caution RiskTetrahexyldecyl ascorbate itself does not directly increase photosensitivity. However, as an antioxidant it is often paired with SPF products, and vitamin C derivatives can degrade with UV exposure, reducing efficacy. Daily SPF use is strongly recommended when using any vitamin C derivative to protect results and prevent further photodamage.
Is Tetrahexyldecyl Ascorbate safe during pregnancy?
CautionTopical vitamin C derivatives including tetrahexyldecyl ascorbate are generally considered low risk during pregnancy due to minimal systemic absorption. However, clinical safety data specific to pregnancy is limited. The Cosmetic Ingredient Review (CIR) has not issued specific guidance. Consult a healthcare provider before use during pregnancy or breastfeeding.
How does Tetrahexyldecyl Ascorbate work?
Tetrahexyldecyl ascorbate (THDA) is a stable, oil-soluble ester form of vitamin C that penetrates the skin more effectively than water-soluble ascorbic acid, thanks to its lipophilic structure. Once absorbed, it converts to active L-ascorbic acid within the skin layers, delivering antioxidant protection, collagen synthesis support, and melanin-inhibiting effects. It was developed to overcome the instability and oxidation issues associated with traditional vitamin C (ascorbic acid).
Individuals with known vitamin C allergy should review the considerations above before use.
Which products contain Tetrahexyldecyl Ascorbate?
Shop products that contain Tetrahexyldecyl Ascorbate
