# Glutathione serum for dull-looking skin: HEEDA All-in-One Serum

- By Yunseul (https://superchart.com/en/@jeju-lunch-break/)
- Written Sep 5, 2026
- Updated Sep 11, 2026
- Products › Beauty products
- Product provided: I received this product and used it for one week. [type=provided]
- English edition: https://superchart.com/en/@jeju-lunch-break/heeda-glutathione-serum-weekly-use/
- Also in: [한국어](https://superchart.com/ko/@jeju-lunch-break/heeda-glutathione-serum-weekly-use/index.md)

## In short

HEEDA Glutathione All-in-One Serum is a 30ml Korean skincare serum I used morning and night for one week for skin that looked dull. It absorbed lightly with almost no scent and left a subtle glow, though any change in skin tone was only my personal impression.

## Good to know

- **Product**: HEEDA Glutathione All-in-One Serum
- **Volume**: 30ml
- **Test period**: 1 week, morning and night
- **Where to buy**: Search for “HEEDA serum” on Coupang

*Prices as written by the tester on Sep 5, 2026 · not updated automatically*

## How did I use it for one week?

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-01-b9ajl-1200.webp)

On many days, my skin looked dull and lacked vitality, so I tried HEEDA Glutathione All-in-One Serum. Rather than looking for a change in a day or two, I applied it morning and night for one week with the intention of using it consistently.

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-02-yi3wa-900.webp)

## How did it feel to apply and after absorption?

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-03-1by9o-900.webp)

The smooth texture was easy to spread over my skin, and it applied with moisture without feeling like it sat heavily on the surface. It absorbed quickly and left a clean finish, so even when I applied makeup after using it in the morning, it did not feel as though it pilled much.

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-04-h3qty-900.webp)

## Is it suitable for people sensitive to fragrance?

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-05-1bh35-900.webp)

I do not prefer strongly scented skincare, and this serum had almost no noticeable fragrance. I could only detect it faintly when first applying it, so it felt less burdensome to use every morning and night.

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-06-23sqs-900.webp)

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-07-b2t3p-900.webp)

## How did my skin look after one week?

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-08-z5uwd-900.webp)

When I looked in the mirror, I felt that my skin seemed a little clearer than before. After applying the serum, it felt moisturized rather than excessively shiny, with a subtle sheen that gave it a naturally glowing finish.

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-09-1e82i-900.webp)

However, any change in skin tone was my personal impression after using it, so I cannot make a definite claim about its effects. I was pleased with how light it felt to layer on days when my skin looked dull.

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-10-1ra64-900.webp)

## Is it convenient for busy mornings?

![Glutathione serum for dull-looking skin: Heeda All-in-One Serum](https://img.superchart.com/images/heeda-glutathione-serum-weekly-use/heeda-glutathione-serum-weekly-use-11-obs2s-900.webp)

The 30ml size was easy to spread on and let absorb even on mornings when I was short on time. I found myself reaching for it without hesitation on days when it was difficult to keep up with several skincare steps.

## Products

- Heeda Glutathione Brightening Tone Care Glow Serum, 30ml — HEEDA
- 1주일, 아침저녁
- 쿠팡 — '희다 세럼' 검색 후 구매

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Superchart · https://superchart.com/en/@jeju-lunch-break/heeda-glutathione-serum-weekly-use/ · https://superchart.com/llms.txt