Vitamin C is one of the most searched and recommended skincare ingredients - and for good reason. It brightens, firms, evens skin tone, and helps defend against premature ageing. But not all Vitamin C is created equal. At Bloc Skincare, we use Tetrahexyldecyl Ascorbate, a next-generation form of Vitamin C that’s more stable, more gentle, and more effective than traditional ascorbic acid - especially for sensitive or reactive skin types.
In this blog, we’ll explore the benefits of this advanced Vitamin C, how it works in the skin, and why it’s the hero in our Pro-C Serum.
What Is Tetrahexyldecyl Ascorbate?
Tetrahexyldecyl Ascorbate (THD Ascorbate) is a highly stable, oil-soluble derivative of Vitamin C. Unlike pure ascorbic acid, which can be irritating or unstable in water-based formulas, THD Ascorbate penetrates deeper into the skin and converts to active Vitamin C once absorbed. This means:
- Less irritation
- More targeted action
- Longer shelf life
It’s also more compatible with other skincare ingredients - making it ideal for layering in your routine.
Why Your Skin Loves Vitamin C
No matter your skin concern, Vitamin C offers multi-tasking benefits that make it a non-negotiable in your routine:
- Brightens dull skin and promotes a radiant glow
- Evens out hyperpigmentation, sun spots, and post-acne marks
- Boosts collagen production for firmer, smoother skin
- Neutralises free radicals caused by UV and pollution
- Supports overall skin clarity and tone
Ingredient Spotlight: Bloc’s Pro-C Serum
Bloc’s Pro-C Serum is our antioxidant-rich, skin-brightening powerhouse. It combines the stabilised strength of Tetrahexyldecyl Ascorbate with skin-repairing peptides, hydrating hyaluronic acid, and calming Australian botanicals.
Key Ingredients & Benefits:
- Tetrahexyldecyl Ascorbate: Delivers high-potency Vitamin C deep into the skin with minimal irritation.
- Squalane & Caprylic/Capric Triglyceride: Nourish and soften the skin barrier.
- Hydrolyzed Glycosaminoglycans & Sodium Hyaluronate: Hydrate and plump from within.
- Cyclotetrapeptide-24 Aminocyclohexane Carboxylate: A cutting-edge peptide that supports skin firmness and reduces the appearance of fine lines.
- Tasmannia Lanceolata (Tasmanian Pepper Leaf Extract): Soothes and reduces inflammation, ideal for sensitive skin.
- Tocopheryl Acetate (Vitamin E): Works synergistically with Vitamin C for antioxidant protection.
How to Use Bloc's Pro-C Serum
Apply 1–2 pumps to clean, dry skin in the morning. Follow with moisturiser and SPF. The serum layers beautifully under other treatments and enhances the performance of your sunscreen.
Why We Chose Tetrahexyldecyl Ascorbate
At Bloc, we design skincare that delivers clinic-level results with everyday simplicity. THD Ascorbate is the gold standard for modern Vitamin C - it’s powerful, penetrative, and gentle. When paired with supportive actives like peptides, botanicals and hydrating ingredients, it becomes a complete skin-brightening, barrier-supporting solution.
