Tranexamic Acid Niacinamide Serum — Reddit Reviews
by Cos De BAHA
Updated October 1, 2026
Tranexamic acid plus niacinamide for fading dark spots; super slippy and hydrating.
What the community says
Redditors mostly use this for PIH and dark spots, with one thread calling it a repurchase-worthy staple. People also like the hydrating, slippy feel and the bit of oil control from the niacinamide.
What this means for you
What people love
- Fades PIH and dark spots
- Super hydrating, slippy finish
- Some oil control from niacinamide
Watch out for
- No real complaints surfaced in the quotes
- Threads are mostly mentions and routine lists, not full reviews
- Community signal is thin beyond PIH and hydration
Product details
Skin type data limited
Where to buy
What the science says
Hyperpigmentation
Strong evidence
Tranexamic Acid: 12 studies tested it on its own. See all 21 studies
Both ingredients for hyperpigmentation
Tranexamic Acid Strong evidence
- Most studies found tranexamic acid helped fade dark patches, especially in melasma
- Some studies found it worked better than a placebo
- It often worked about as well as hydroquinone
- Used with laser or microneedling, it sometimes faded patches more than those treatments alone
Studied at 1–5%this product: 5%
Niacinamide Some evidence
5 studies tested it on its own. See all 24 studies
- All of these studies found niacinamide helped fade dark spots or patches
- In clinical trials, 5% niacinamide faded dark spots more than a placebo
- It also helped when used with salicylic acid peels, more than peels alone
- Used on its own, it helped, but one study found a niacinamide mix worked better
- One study found the fading effect reversed after stopping niacinamide
Studied at 2–10%this product: 5%
Acne
Some evidence
Niacinamide: 6 studies tested it on its own. See all 17 studies
What the studies found
- Most studies found niacinamide helped acne
- Some studies found 4% niacinamide cleared acne about as well as clindamycin
- One study found 4% niacinamide improved red, sore spots, but IPL worked better
- Some research found no clear difference, and a large review said the effects were uncertain
Studied at 4–10%this product: 5%
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 8 mentions across 6 threads
Cos De BAHA Tranexamic Acid Niacinamide Serum on Reddit, in one place — 6 threads from r/AsianBeauty, summarized.
“-Cos De BAHA Tranexamic Acid Niacinamide serum”
Mentioned
“I also always repurchase both Cosrx snail goodness, Cos de Baha tranexamic, and that Soon Jung Barrier Cream 😍”
Mentioned
“I love hauls like thesssseeeeee! Pls review the BoJ products and the Cos de Baha ones 🙏”
Mentioned
“Cos De Baha Tranexamic Acid Niacinamide serum: fades PIH so well with some oil control”
Positive
“Cos de Baha's Tranexamic Acid for the day as it is SUPER hydrating and slippy while providing a healthy appearance the whole day”
Positive
“- Cos de Baha tranexamic acid, pyungkang yul essence toner and clinique 72 hour hydrator”
Positive
“Cos De BAHA TN Tranexamic Acid Niacinamide Serum”
Mentioned
“And my complete current routine is the following”
Mentioned
“PIH: Cos De Baha Tranexamic Acid Niacinamide serum (fades dark spots in 2-3 months)”
Positive
“Do you use the Cos De Baha Tranexamjc Acid Niacinamide serum with the Illiyoon cream?”
Positive
“Cos De Baha Tranexamic Acid Niacinamide serum (fades dark spots in 2-3 months)”
Positive
“Cos De BAHA Tranexamic Acid Niacinamide Serum”
Mentioned
“Hoping to find the right skincare to heal my damaged skin barrier and post-inflammatory hyperpigmentation.”
Mentioned
“Starting off with too many new skincare products could possibly cause an adverse reaction”
Mentioned
“Cos De BAHA Tranexamic Acid Niacinamide Serum (TN)”
Mentioned
“change to Cos De BAHA Tranexamic Acid 10 Serum (TT)”
Mentioned
“or Cos De BAHA Tranexamic Acid 15 Serum (T15)”
Mentioned
