
The Blue Copper Peptide Bakuchiol Serum — Reddit Reviews
by COSRX
Updated October 17, 2026
Peptide serum people consider for flexible AM/PM use; little firsthand feedback.
What the community says
A peptide-and-bakuchiol serum that Redditors are still figuring out, with questions around whether it belongs in morning or evening routines. One commenter thinks it could work in the morning; firsthand usage reports remain thin.
What this means for you
What people love
Product details
Skin type data limited
Where to buy
What the science says
Acne
Some evidence
Niacinamide: 6 studies tested it on its own. See all 17 studies
Hyperpigmentation
Some evidence
Niacinamide: 5 studies tested it on its own. See all 20 studies
What the studies found
- All 5 studies that tested it on its own found it helped fade dark spots
- On its own, it reduced facial darkening and made skin look lighter than a placebo
- It also improved dark spots linked with sun damage in one clinical trial
- Used with other ingredients, it faded patches more than niacinamide alone or the other ingredient alone
- The side effects were similar and mild in the study that reported them
Anti-Aging
Some evidence
Niacinamide: 3 studies tested it on its own. See all 9 studies
All 3 ingredients for anti-aging
Niacinamide Some evidence
- All 3 studies that tested it on its own found it helped with signs of aging
- Studies found it improved the look of wrinkles and made skin seem firmer
- Studies also found it helped dark spots and reduced redness and yellowing
- One study found it helped skin hold more water and lowered water loss through the skin
- Used with another ingredient, it improved dark spots, fine lines, wrinkles, and firmness more than niacinamide alone
Bakuchiol Not proven yet
Few or mixed studies. This claim isn't established.
2 studies tested it on its own. See all 6 studies
- Both studies that tested it on its own found it helped with signs of aging
- It improved skin smoothness, appearance, and how much water the skin held
- It reduced wrinkles and dark spots about as well as retinol
- The reported side effects were less scaling and stinging than retinol
Studied at 5%this product: 0.25%
Peptides Not proven yet
Few or mixed studies. This claim isn't established.
2 studies tested it on its own. See all 6 studies
- Both studies that tested it on its own found it helped with signs of aging
- Studies found it improved firmness and made skin texture look smoother
- One study found it reduced wrinkles and improved how much water the skin held
- One study found it worked better than a human-derived growth factor serum for skin texture and firmness
- No stinging, itching, or discomfort was reported in one study
Skin Barrier
Not proven yet
Few or mixed studies. This claim isn't established.
Niacinamide: 1 study tested it on its own. See all 17 studies
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 3 mentions across 1 thread
COSRX The Blue Copper Peptide Bakuchiol Serum on Reddit, in one place — 1 thread from r/40plusskincare, summarized.
“Cosrx blue peptide serum”
Mentioned
“Look at these products:”
Mentioned
“In general just look at Korean skincare.”
Mentioned





