Brightening serum for dull skin: HEEDA Glutathione Serum
In short
HEEDA Glutathione Serum is a 30 ml brightening serum I used for visible dark spots and a dull-looking skin tone in Korea. It felt smooth, light, and quick-absorbing with little stickiness, though I plan to watch for skin-tone changes after finishing the bottle.

Good to know
- Product
- HEEDA Glutathione Serum
- Volume
- 30 ml
- When I used it
- During my morning skincare routine and as the final step of my evening routine
- Skin concerns
- Visible dark spots and a dull-looking skin tone
- Where to buy
- Search “HEEDA serum” on Coupang
Prices as written by the tester on Aug 31, 2026 · not updated automatically
Was it comfortable to use without stickiness?

I do not like sticky formulas that feel as though they leave a film on my skin, but this serum spread smoothly when I dispensed it onto my hand and applied it. It felt like it absorbed faster than I expected, and it did not leave a heavy, cream-like finish, so I have been happy with how it feels so far.


What skin concerns did I use it for?

On days when my dark spots were noticeable and my skin tone looked dull, I used it because I wanted to keep up brightening care as well as hydration. I had previously tried a cream from the same functional line, but the serum felt lighter in both texture and use.

How did I apply it morning and night?


It did not feel burdensome to apply during my morning skincare routine, and at night I used it as the final step of my basic skincare routine. Even on days when applying skincare felt like a chore, I reached for it because it felt light.

What did I expect from brightening care?

Rather than expecting dark spots or my skin tone to change dramatically in a short time from one cosmetic product alone, I see value in caring for my skin consistently alongside sun protection. According to the original post, this product was reported to the Ministry of Food and Drug Safety as a functional whitening cosmetic, and results from a low-irritation test and a sensitive-skin use test are available. I plan to keep using one bottle and observe any changes in my skin tone myself.


What have I liked most so far?

So far, I have liked its fresh application, non-sticky finish, and texture that is easy to use every day. This is a personal use record that may be useful if you prefer a lighter, absorbent feel over a heavy, sticky serum.
Where to buy
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