---
product_id: 659596294
title: "Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml"
brand: "cos-iq"
price: "NT$1135"
currency: TWD
in_stock: true
reviews_count: 5
category: "Cos Iq"
url: https://www.desertcart.tw/products/659596294-cos-iq-20-vitamin-c-face-serum-with-vit-e
store_origin: TW
region: Taiwan
---

# 30ml lightweight, fast-absorbing serum 20% pure Vitamin C (L-Ascorbic Acid) potency 41% reduction in oxidative damage Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml

**Brand:** cos-iq
**Price:** NT$1135
**Availability:** ✅ In Stock

## Summary

> ✨ Glow like you mean it — your skin’s new power move!

## Quick Answers

- **What is this?** Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml by cos-iq
- **How much does it cost?** NT$1135 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/659596294-cos-iq-20-vitamin-c-face-serum-with-vit-e)

## Best For

- cos-iq enthusiasts

## Why This Product

- Trusted cos-iq brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Clean & Lightweight:** Unscented, gel formula absorbs quickly without residue—perfect for busy professionals.
- • **Radiance Revolution:** Potent 20% Vitamin C brightens and evens skin tone for a glow that commands attention.
- • **Age-Defying Powerhouse:** Visibly reduces fine lines, wrinkles, and loss of firmness for a youthful bounce.
- • **Hyperpigmentation Hero:** Targets dark spots and sun damage, fading pigmentation for a flawless complexion.
- • **Triple Antioxidant Shield:** Vitamin C, E & Ferulic Acid team up to neutralize 41% of environmental damage daily.

## Overview

COS-IQ’s 20% Vitamin C Face Serum combines high-potency L-Ascorbic Acid with Vitamin E and Ferulic Acid to deliver advanced antioxidant protection, reducing oxidative damage by up to 41%. This 30ml lightweight, unscented gel serum visibly brightens skin, diminishes fine lines and wrinkles, and fades dark spots, making it an essential daily defense against environmental aging for all skin types.

## Description

Cef Features a Synergistic Antioxidant Combination of 20% Pure Vitamin C (L-Ascorbic Acid), 1% Vitamin E (AlpHa TocopHerol), and 0.5% Ferulic Acid to Enhance Protection Against Environmental Damage Caused by Free Radicals That Can Contribute to AtmospHeric Aging. Cef is Now Proven to Reduce Combined Oxidative Damage Generated by UVA/UVB Rays, Ozone Pollution, and Diesel Engine Exhaust by Up to 41%. in Addition to Antioxidant Protective Benefits, Cef Improves Signs of Aging and pHotodamage, the Appearance of Lines and Wrinkles, and the Loss of Firmness, While Brightening Skin's Complexion. a Patented Daytime Vitamin C Serum That Delivers Advanced Environmental Protection and Improves the Appearance of Fine Lines and Wrinkles, Loss of Firmness, and Brightens Skin's Complexion. The Active Ingredients in the Serum Penetrate the Skin from Within to Lighten the Skin Tone, Giving It a Radiant Look – Revives Skin by Bringing Out Its Natural Radiance. Fights Hyperpigmentation – Hyperpigmentation is Caused Due to Unprotected Sun Exposure. The Antioxidant Properties of Vitamin C Protect Against UV Induced pHotodamage – Antioxidants and Anti-Inflammatory.

Review: Noticeable Glow and Smooth Skin in Just a Week! - I've been using the COSIQ Vitamin CEF-20% Face Serum for a week now, and I'm genuinely impressed. The texture is lightweight and absorbs quickly without leaving any greasy residue. Within a few days, I noticed my skin looking brighter and more radiant. The serum claims to reduce dark spots and hyperpigmentation, and I can already see a slight improvement in my uneven skin tone. My fine lines also look a bit softer, and my skin feels more elastic and hydrated. I especially love that it uses Ethylated Ascorbic Acid – it's gentle but effective. Overall, a great product if you're looking for brighter, healthier-looking skin. Definitely worth trying!
Review: Removed dull skin - The best vitamin c serum , removed my full skin and tan . And spot reduction

## Features

- Visible anti-aging benefits, such as the improvement of the appearance of lines and wrinkles, loss of firmness, and brightens skin’s complexion
- All round skin benefits brightens skin vitamin c in 3-o-ethyl ascorbic acid form has an immense brightening effect. It's formulated to make skin glow by removing blemishes and fine lines. Ethylated ascorbic acid is the most potent form vitamin c thats safe to use and penetrates the skin tone, giving it a radiant look.
- Repairs & rejuvenates fights hyperpigmentation hyperpigmentation is caused due to unprotected sun exposure neutralizes free radicals and prevents inflammatory processes to slow down photoaging that causes pigmentation has a direct effect on hyperpigmentation, age spots & sun spots. The antioxidant properties of vitamin c protect against UV, pollution and environment induced photodamage.
- Natural skin health evens skin tone active in fading pigmentation evens out skin tone protects the skin against premature aging triggered by free radicals that cause oxidative stress helps the skin produce collagen and elastin to make our skin soft and bouncy for both men and women maximum results guaranteed with our star ingredient.
- Package Content: 1 Vitamin C-20% Face Serum; Quantity: 30ml; Item Form: Serum

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BTR7SNV1 |
| Active Ingredients | vitamin_c |
| Age Range Description | Adult |
| Age range (description) | Adult |
| Best Sellers Rank | #166,384 in Beauty ( See Top 100 in Beauty ) #1,559 in Face Astringents & Toners |
| Brand | COS-IQ |
| Brand Name | COS-IQ |
| Customer Reviews | 4.1 out of 5 stars 321 Reviews |
| Item Dimensions | 20 x 20 x 30 millimeters |
| Item Form | Gel |
| Item Volume | 30 Milliliters |
| Item Weight | 30 Grams |
| Item dimensions L x W x H | 20 x 20 x 30 millimeters |
| Item volume | 30 Milliliters |
| Manufacturer | Cos-IQ® |
| Manufacturer Part Number | CEF20 |
| Model Number | CEF20 |
| Number of Items | 1 |
| Other Special Features of the Product | Unscented |
| Scent Name | Unscented |
| Skin Type | All |
| Special features | Unscented |
| Specific Uses For Product | Dark Spots, Wrinkles |
| Unit Count | 30.0 Milliliters |

## Product Details

- **Age range (description):** Adult
- **Brand:** COS-IQ
- **Item dimensions L x W x H:** 20 x 20 x 30 millimeters
- **Item volume:** 30 Milliliters
- **Special features:** Unscented

## Images

![Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml - Image 1](https://m.media-amazon.com/images/I/712k64z34SL.jpg)
![Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml - Image 2](https://m.media-amazon.com/images/I/71wPIhzc6BL.jpg)
![Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml - Image 3](https://m.media-amazon.com/images/I/71vl0SEp-IL.jpg)
![Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml - Image 4](https://m.media-amazon.com/images/I/71gprCSvinL.jpg)
![Cos-IQ 20% Vitamin C Face Serum With Vit E, & Ferulic Acid | Safe and Effective Skin Brightening Serum for Glowing Skin, Protects Against, Wrinkles, Fine Lines, Dark Spots | 30ml - Image 5](https://m.media-amazon.com/images/I/71ZwBSVGgsL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Noticeable Glow and Smooth Skin in Just a Week!
*by V***T on 15 June 2025*

I've been using the COSIQ Vitamin CEF-20% Face Serum for a week now, and I'm genuinely impressed. The texture is lightweight and absorbs quickly without leaving any greasy residue. Within a few days, I noticed my skin looking brighter and more radiant. The serum claims to reduce dark spots and hyperpigmentation, and I can already see a slight improvement in my uneven skin tone. My fine lines also look a bit softer, and my skin feels more elastic and hydrated. I especially love that it uses Ethylated Ascorbic Acid – it's gentle but effective. Overall, a great product if you're looking for brighter, healthier-looking skin. Definitely worth trying!

### ⭐⭐⭐⭐⭐ Removed dull skin
*by M***I on 13 May 2026*

The best vitamin c serum , removed my full skin and tan . And spot reduction

### ⭐⭐⭐⭐ Happy
*by L***A on 21 September 2025*

Happy with the results of this serum. Protects skin from dryness. Very effective for dry skin and texture of serum is good blends well into skin and fragrance is good.

## Frequently Bought Together

- Cos-IQ 20% Vitamin C Serum, 30ml | With Vitamin E & Ferulic Acid | Glowing & Brightening Skin | Anti-Aging Serum for Wrinkles, Fine Lines & Dark Spots | All Skin Types | 30-Days Pack
- Cos-IQ 20% Niacinamide Face Serum For Clear Glowing Skin, Bright Skin, Reduces Dullness, Hydrates & Repairs Skin with Vit B3 & Hyaluronic Acid for Targets Acne Marks | For Women & Men | 30ml
- Cos-IQ CPM 2% Ceramides Moisturizer with Peptides for Intense Moisturizing and Skin Strengthening | Barrier Repair Cream | For Oily, Dry, Normal & Sensitive Skin | 100ml

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.tw/products/659596294-cos-iq-20-vitamin-c-face-serum-with-vit-e](https://www.desertcart.tw/products/659596294-cos-iq-20-vitamin-c-face-serum-with-vit-e)

---

*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-08-01*