Primal Basics Vitamin C Serum 10% THD Ascorbate, 1.7 oz Airless Pump — Stable, Brightening, Gentle for Sensitive Skin

Primal Basics 10% Tetrahexyldecyl Ascorbate Vitamin C Serum is a stable, oil-soluble vitamin C formula designed to brighten skin, reduce dark spots, and stay potent longer than typical ascorbic acid serums.

This serum uses THD Ascorbate — a plant-derived, oil-soluble vitamin C that resists oxidation and penetrates the skin more deeply than traditional ascorbic acid. The 1.7 oz airless pump bottle delivers nearly double the product of standard 1 oz serums and preserves potency by keeping light and air out. The formulation is fragrance-free, silicone-free, and built around naturally derived ingredients like Centella Asiatica and Vitamin E to calm and support the skin barrier.

How does THD Ascorbate differ from regular vitamin C serums?

THD Ascorbate is an oil-soluble derivative of vitamin C, which makes it more stable against air and light and less likely to oxidize into a yellowed, ineffective product. Unlike ascorbic acid, it’s pH-neutral and less likely to cause stinging or redness, so it can be better tolerated by sensitive skin.

• Oil-soluble form penetrates deeper into the skin.
• Stays stable longer — minimal yellowing or loss of potency.
• P H neutral, reducing irritation risk compared with acidic formulas.

What visible changes can I expect and how long will they take?

With daily morning use, the serum aims to brighten overall tone, soften texture, and reduce the appearance of hyperpigmentation and dark spots over time. Results are gradual: many users notice a difference in brightness and texture around 2–3 months, with continued improvement thereafter.

• Gradual brightening and radiance with consistent use.
• Noticeable reduction in dark spots after several weeks to months.
• Improved skin texture and smoother appearance over time.

How should I apply this serum in my routine and will it irritate my skin?

Apply 1–2 pumps to clean, dry skin each morning before moisturizer and sunscreen. Because THD Ascorbate is pH-neutral and oil-soluble, it typically causes less stinging than acidic vitamin C serums, making it suitable for sensitive or reactive skin when used as directed.

• Use 1–2 pumps each morning after cleansing.
• Follow with your moisturizer and broad-spectrum sunscreen.
• Patch-test if you have highly reactive skin; stop if irritation occurs.

Why is the 1.7 oz airless pump important?

The larger 1.7 oz volume gives you more applications per bottle compared with standard 1 oz serums, and the airless pump minimizes exposure to oxygen and light so the serum maintains potency from first pump to last. The dispensing also helps control dosage and keeps the formulation fresh.

• Nearly double the typical bottle size for longer use.
• Airless packaging reduces oxidation and product waste.
• Controlled pump delivery prevents contamination and overuse.

Who this is for: Primal Basics 10% THD Ascorbate Vitamin C Serum is suited to anyone seeking a gentler, stable vitamin C option—especially people with sensitive or easily irritated skin, those wanting to target uneven tone or dark spots, and users who prefer clean, naturally derived ingredients without fragrance or silicones. If you want a long-lasting bottle with reliable antioxidant support in your morning routine, this serum was formulated for that purpose.

Ingredients

Aqua, Tetrahexyldecyl Ascorbate, Propanediol, Glycerin, Sodium Stearoyl Glutamate, Sorbitan Caprylate, Centella Asiatica Extract, Cetearyl Olivate, Sorbitan Olivate, Caesalpinia Spinosa Gum, Tetrasodium Glutamate Diacetate, Citric Acid, Tocopherol, Benzoic Acid