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

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.

How did it feel to apply and after absorption?

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.

Is it suitable for people sensitive to fragrance?

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.


How did my skin look after one week?

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.

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.

Is it convenient for busy mornings?

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.
Where to buy
- Tested
- 1주일, 아침저녁
- 쿠팡
- '희다 세럼' 검색 후 구매






