Almost all niacinamide serums on the market claim to bright complexion and even skin tone.

However, the detailed analysis of consumer reviews by COSRX have shown that people are more impressed by its "effectiveness on acne" rather than brightening.

So, COSRX started research based on real consumer reviews that niacinamide is effective on acne. After running countless formulations, a "total acne care" serum has been developed with optimal combination of synergistic ingredients that targets acne from the beginning to the end.


💡Here are some frequently asked questions you would like to know.

Efficacy of Main Ingredient

 Q1.What does Niacinamide do to your skin?

-Build up skin barrier and reduce moisture loss
-Moisturize in the damaged corneous layers
-Reduce acne such as comedonal acne, acne papules and pimple pus
-Approved to treat acne compared to antibiotics for acne
-Relieve inflammation caused by propionibacterium acne
-Inhibit the overproduction of sebum and control sebum
-Treat post-inflammatory pigmentation and inhibit the appearance of age spots, blemishes, and hyperpigmentation
-Prevent from erythema and inflammation caused by UV rays

Q2.How does Niacinamide do to your skin?
-The symptoms of the early stage of acne formation begin with excessive sebum and clogged pores caused by a buildup of dead skin cells. Due to thick layers of dead skin cells pile up and harden, sebum can become trapped in a follicle which can then lead to severe acne caused by propionibacterium acne. Therefore, niacinamide is crucial for preventing acne. It reduces excess sebum from the first signs of acne and prevent inflammation caused by propionibacterium acne. During the process of acne formation niacinamide plays a role in treating acne by working on various factors of acne mechanism.

Q3.What goes well with Niacinamide?
-BHA for acne care synergy and Propolis for anti-inflammatory

Efficacy of Sub Ingredients

Q4.What does N-Acetylglucosamine(NAG) do to your skin?
-Moisturize and remove dead skin cells
-Confirmed the possibility of an ingredient which can replace AHA
-Improve the hyperkeratinization on the pore surface by working mechanism
-Increase synthesis of hyaluronic acid in keratinocytes
-Pairing with retinoic acid and retinol is highly effective.
-Combining with niacinamide improves hyperpigmentation.

Q5.What does Zinc PCA do to your skin?
-Effective for reducing sebum from acne-prone and oily skin without damaging corneous layers
-Reduce inflammation by working mechanism
-Reduce immune activation
-Help the process of skin repair as an essential element for cell growth and multiplication
-Take important roles in the synthesis of retinol and reduce acne

Q6.What does Allantoin do to your skin?
-Promote skin repair by working mechanism of wound healing
-Stimulate collagen production to repair skin
-Exhibited antibacterial activity against bacteria
-The more allantoin is contained, the more antibacterial activity is effective


Q7.Can you use vitamin C and niacinamide together?
-No, we recommend using Niacinamide and vitamin C separately because both ingredients are high-concentrated and it can be caused too much irritation to skin.

Q8.What can I use niacinamide with?
-Anything goes with niacinamide, but it is best when paired with BHA or Propolis.

Q9.Can I use salicylic acid and niacinamide together?
-Yes, when Niacinamide combines BHA which is good treatment for pores and sebum, it is more helpful in unclogging pores and reducing excess sebum.


Recommended skin types to use

Q10.Who should use niacinamide?
-All skin type, especially Oily and Acne-prone skin

Q11.Who should use/not use niacinamide?
-It’s good for all skin types. Although we recommend The Niacinamide 15 Serum for oily and acne skin. However, it can be used for dry skin.

Comparison between Ingredients

Q12.Which is more effective niacinamide or vitamin C?
-Niacinamide which helps minimize the look of pores and enhance antibacterial activity is good treatment for acne. Vitamin C is one of the best anti-aging ingredients and helps your skin brighter while inhibiting the formation of melanin. It’s good for anti-aging and improving skin elasticity by increasing in collagen and elastin production.

Q13.Is hyaluronic acid better than niacinamide?
-Hyaluronic acid keeps skin moisturized and niacinamide which helps minimize the look of pores and enhance antibacterial activity is good treatment for acne.

Q14.Is vitamin C or niacinamide better for dark spots?
-Vitamin C helps your skin brighter while inhibiting the formation of melanin and niacinamide is an effective skin lightening compound that works by inhibiting melanosome transfer from melanocytes to keratinocytes. They work in different ways but help your skin brighter. Niacinamide helps minimize the look of pores and enhance antibacterial activity is good treatment for acne

Side effects

Q15.What are the side effects of niacinamide?
-A high concentration of niacinamide can cause skin irritation such as redness and itching, however it’s not harmful effects but it’s burning accompanied by blood vessels to widen. It has nothing to do with skin problems.