Isntree Hyper Vitamin C 23 Serum 20ml – Brightening & Dark Spot Serum

The Isntree Hyper Vitamin C 23 Serum is built around pure L-Ascorbic Acid at 23% — the most extensively researched form of vitamin C in topical skincare. It works by inhibiting melanin production through suppression of tyrosinase activity, and by neutralising free radicals caused by UV exposure and environmental stress.

Ethyl Ascorbyl Ether — a stabilised vitamin C derivative included alongside L-Ascorbic Acid for additional brightening support.

Panthenol (Vitamin B5) — soothes and supports the skin barrier, helping offset potential sensitivity from high-concentration vitamin C.

Tocopherol (Vitamin E) — works alongside Vitamin C as a complementary antioxidant. Vitamin C helps regenerate Vitamin E after it intercepts free radicals, supporting broader antioxidant protection.

Adenosine — supports skin firmness and smoothness.

Betula Platyphylla Japonica Juice (White Birch Juice) — provides additional skin conditioning and hydration support.

Compact 20ml format — helps keep vitamin C fresher during use cycles. Pure L-Ascorbic Acid oxidises faster once opened. The smaller format means you finish the bottle before oxidation degrades the formula.

The Isntree Hyper Vitamin C 23 Serum is suited for skin experiencing:

Dullness and lack of radiance · Dark spots and post-acne marks · Uneven skin tone · Sun damage and early hyperpigmentation · Skin that needs antioxidant protection

Skin types: Normal, oily, and combination skin. Not recommended for sensitive or reactive skin — pure L-Ascorbic Acid at 23% is a high-strength active that may cause irritation on compromised or sensitive skin.

Note: Always follow with SPF in the morning. Vitamin C increases skin sensitivity to UV exposure. Introduce gradually — start every second day and build to daily use.

When: Morning skincare routine, after cleansing and before moisturiser and SPF.

How: Apply 2–3 drops of the Isntree Hyper Vitamin C 23 Serum onto clean skin. Gently press and pat into face and neck until absorbed. Do not rub.

Frequency: Start every second day for the first 2 weeks. Build to daily use once skin has adjusted.

Storage: Store in a cool, dry place away from direct sunlight. Refrigeration extends shelf life once opened.

Pro tip: Pair with a broad-spectrum SPF 50+ every morning — vitamin C fades existing pigmentation, SPF prevents new damage from forming. Together they are significantly more effective than either product alone.

Water, Ascorbic Acid (23%), Propanediol, Betaine, 1,2-Hexanediol, Polyglycerin-3, Tromethamine, Ethyl Ascorbyl Ether, Hydroxyethyl Urea, Betula Platyphylla Japonica Juice, Ethylhexylglycerin, Adenosine, Disodium EDTA, Panthenol, Gardenia Florida Fruit Extract, Dextrin, Tocopherol

Always check the physical packaging upon receipt as formulations may be updated by the manufacturer.

Why is 23% vitamin C considered high and is it safe to use?
The Isntree Hyper Vitamin C 23 Serum uses pure L-Ascorbic Acid — the most extensively researched form of vitamin C in skincare. At 23%, it is a high-strength active. Most vitamin C serums sit between 10–20%. This concentration can deliver visible brightening results but requires proper introduction. Start by using the Isntree Hyper Vitamin C 23 Serum every second day for the first two weeks, then build to daily use as your skin adjusts. If you have sensitive or reactive skin, a lower-concentration formula may be more suitable.

Why does the Isntree Hyper Vitamin C 23 Serum come in a 20ml bottle?
Pure L-Ascorbic Acid begins to oxidise once a bottle is opened and exposed to air and light. A larger bottle means more product exposed to oxygen over a longer period before you finish it. The compact 20ml format helps keep the Isntree Hyper Vitamin C 23 Serum fresher and more potent throughout your use cycle — so you get the full benefit of the 23% concentration from first use to last drop.

Can I use the Isntree Hyper Vitamin C 23 Serum alongside other actives?
The Isntree Hyper Vitamin C 23 Serum is best applied to clean skin before other serums and moisturiser. Always follow with a broad-spectrum SPF 50+ in the morning when using high-strength vitamin C. It pairs well with a hydrating toner or essence applied after, and with a gentle moisturiser to support the skin barrier.