EAA20 Brightening Antioxidant Serum 30ml｜Ethyl Ascorbic Acid brightens and evens skin tone · Antioxidant · Stable and non-yellowing | Made in Hong Kong

Dull skin, uneven skin tone, stubborn acne marks – it's not that you're not trying hard enough with your skincare, it's that the Vitamin C you're using keeps oxidizing and losing its effectiveness.

EAA20 Brightening & Antioxidant Serum features a 20% high-concentration formula of the new-generation Vitamin C derivative, 3-O-Ethyl Ascorbic Acid (Ethyl Vitamin C). Its stability far surpasses traditional L-Ascorbic Acid, making it less prone to oxidation and yellowing, with long-lasting and stable efficacy. It can be used morning and night, allowing your brightening efforts to truly deliver the intended results.

🇭🇰 Developed by Hong Kong formulators and manufactured locally in Hong Kong.
Developed and Made in Hong Kong.

30ml｜Lasts approximately 2–3 months

✦ What problems does this serum solve for you?

• Dull, lackluster skin that looks tired and lifeless

• Acne marks, dark spots, and sunspots that linger

• Used Vitamin C products, but they quickly turned yellow and became ineffective

• Worried about "reverse darkening" when using Vitamin C in the morning, so you avoid it

• Want effective antioxidant protection against daily environmental pollution damage to the skin

✦ Why is EAA20 different from other Vitamin C serums?

① 20% High-Concentration Ethyl Ascorbic Acid — Stable and effective next-generation Vitamin C
Traditional Vitamin C (L-Ascorbic Acid) is prone to oxidation and yellowing; the darker the color, the more oxidation and the lower the efficacy. EAA20 uses 3-O-Ethyl Ascorbic Acid, a new-generation Vitamin C derivative with significantly improved stability. It is less likely to oxidize, ensuring that every pump maintains its brightening and antioxidant efficacy.

② Can be used morning and night, debunking the myth of "Vitamin C reverse darkening"
Many people mistakenly believe that using Vitamin C in the morning will cause the skin to "reverse darken." This phenomenon actually stems from the oxidation of traditional L-Ascorbic Acid under UV light, which produces Erythrulose—an ingredient commonly found in self-tanners, leading to a tanned-like color on the skin's surface. The Ethyl Ascorbic Acid used in EAA20 is extremely stable and does not cause this issue, making it safe and effective for morning use.

③ Evens skin tone, accelerates fading of dark spots and acne marks
3-O-Ethyl Ascorbic Acid effectively inhibits Tyrosinase activity, reducing Melanin production. It targets dark spots, acne marks, and uneven skin tone caused by sun exposure, leading to a brighter and more even overall complexion with continued use.

④ Powerful antioxidant, fights free radicals and environmental damage
Vitamin C is one of the most important antioxidants for the skin. The high-concentration formula of EAA20 effectively neutralizes free radicals in the daily environment, including oxidative damage to the skin caused by UV, PM2.5, and pollutants, providing protection for the skin from within and without.

⑤ Minimalist formula, clear and transparent ingredients
EAA20's formula is simple and direct, featuring active ingredients. It is free of alcohol, fragrance, parabens, and MIT, reducing the risk of irritation caused by unnecessary additives. This ensures your skin receives only the essential ingredients it needs, without additional burdens.

✦ Benefits

• Brightens skin tone: Inhibits melanin production, improves dullness and uneven skin tone

• Fades dark spots and acne marks: Continued use effectively reduces hyperpigmentation

• Powerful antioxidant: Neutralizes free radicals, protects against UV and environmental pollution damage

• Collagen support: Vitamin C promotes Collagen synthesis, improving skin elasticity

• Stable and long-lasting: Ethyl Ascorbic Acid is resistant to oxidation, ensuring continuous efficacy

✦ Texture

A clear, watery serum with a light texture that is easily absorbed. It feels non-sticky and leaves no white cast, providing a refreshing and comfortable sensation on the skin. It can be layered at the beginning of your skincare routine and pairs well with other serums and moisturizers without pilling.

✦ Active Ingredients

3-O-Ethyl Ascorbic Acid (Ethyl Vitamin C) — 20%
A new-generation derivative of Vitamin C, stabilized by adding an ethyl group at the 3rd carbon position of the Vitamin C molecule. This significantly enhances its antioxidant stability while retaining the core efficacies of Vitamin C, such as inhibiting Tyrosinase, promoting Collagen synthesis, and providing antioxidant benefits. Compared to traditional L-Ascorbic Acid, Ethyl Ascorbic Acid is less prone to oxidation and discoloration on the skin, offering superior user experience and efficacy stability.

✦ Ingredients List

Aqua, 3-O-Ethyl Ascorbic Acid, Tri-Sodium Citrate Dihydrate, Propanediol, Phenoxyethanol, Caprylyl Glycol, 1,2-Hexanediol, Citric Acid Monohydrate, Xanthan Gum

✦ Suitable for

• All skin types, including oily, dry, combination, and sensitive skin

• Individuals with dull skin lacking radiance

• Individuals concerned about hyperpigmentation such as dark spots, acne marks, and sunspots

• Those who have been disappointed by traditional Vitamin C products due to yellowing and oxidation

• Individuals who prioritize daily antioxidant protection and wish to combat environmental damage

✦ Free From Statement

✅ Alcohol-free
✅ Fragrance-free
✅ Paraben-free
✅ MIT (Methylisothiazolinone)-free

✦ How to Use

1. Use after cleansing morning and night

2. Dispense 1/3 to one pump into your palm and gently press onto your face and neck

3. Once absorbed, follow with your daily lotion or cream

4. When using in the morning, it is recommended to apply SPF protection to further enhance antioxidant effects

⚠️ Before use, it is recommended to perform a patch test behind the ear or on the inner forearm. Avoid contact with eyes and broken skin.

✦ Formulator Q&A

Q: Why did other Vitamin C products I've used turn yellow so quickly?

A: The main weakness of traditional Vitamin C (L-Ascorbic Acid) is its extreme susceptibility to oxidation and yellowing. The darker the color, the higher the degree of oxidation and the lower the efficacy. EAA20 uses Ethyl Ascorbic Acid, a new-generation Vitamin C derivative with significantly improved stability, making it less prone to oxidation and ensuring that the product's efficacy does not diminish over time.

Q: Can EAA20 be used in the morning?

A: Absolutely, EAA20 is suitable for both morning and night use. Many people mistakenly believe that using Vitamin C in the morning will cause "reverse darkening." However, this phenomenon actually arises from the oxidation of traditional L-Ascorbic Acid under UV light, which produces a substance called Erythrulose—a common ingredient in self-tanners, causing a tanned-like color on the skin's surface. The Ethyl Ascorbic Acid used in EAA20 is extremely stable and does not cause this issue, so you can safely use it in the morning.

Q: Can EAA20 be used with REL1 Retinol Serum or NIA10 Oil Control Serum?

A: Yes, they can be used together. Recommended pairing:

• Morning: EAA20 Brightening & Antioxidant Serum, with sunscreen, for antioxidant and brightening effects

• Night: REL1 Retinol Serum for anti-aging and skin renewal, or NIA10 for oil control and anti-inflammatory benefits

Avoid layering high-concentration Vitamin C with Retinol at the same time to maintain optimal results and reduce the risk of irritation.

Q: How long does it take to see brightening effects from EAA20?

A: Immediate radiance improvement is usually noticeable within 1–2 weeks of use; significant fading of acne marks and dark spots generally requires 4–8 weeks of continuous use. It is recommended to also use daily sun protection to prevent new hyperpigmentation and ensure longer-lasting and more noticeable brightening effects.

Q: Is EAA20 suitable for sensitive skin?

A: EAA20's formula is free of alcohol, fragrance, parabens, and MIT, making it generally mild. However, high-concentration Vitamin C derivatives may still cause slight irritation for some extremely sensitive skin types. It is recommended to perform a patch test before first use and start with a lower frequency of use, allowing the skin to gradually adapt.

✦ Why choose EAA20?

Vitamin C is one of the most research-backed active ingredients in skincare, yet most products on the market still use traditional formulas that are prone to oxidation and loss of efficacy. EAA20 is science-based, opting for a more stable and effective new-generation ingredient, ensuring that every pump delivers the intended results, rather than applying an oxidized liquid.

True brightening starts with stable ingredients.

EAA20 is developed by a team of Hong Kong formulators and proudly manufactured locally in Hong Kong. Every drop of serum embodies a dedication to skincare ingredients and a commitment to your skin.
🇭🇰 Proudly Developed & Made in Hong Kong.