COSRX Niacinamide 15% Serum & Peptide Booster Set — Amazon Exclusive duo to refine pores and firm skin

COSRX Niacinamide 15% Peptide Booster Set combines a high-strength niacinamide serum with a peptide-rich booster toner to refine pores, calm redness, and support firmer-looking skin.

This Amazon-exclusive duo brings together COSRX's concentrated Niacinamide 15% Serum and a six-peptide Booster Toner in one set to layer brightening and skin-strengthening benefits. The formula pairing is designed for use after cleansing: the lightweight peptide toner primes and hydrates, while the niacinamide serum targets uneven texture, oiliness, and visible pore size. Because both products are active-focused, the set includes straightforward application steps and a recommended patch test to ensure tolerance.

How does this set improve skin texture and radiance?

The niacinamide serum concentrates on regulating excess oil and smoothing surface irregularities while the peptide toner supports skin elasticity and resilience. Together they work on visual improvements—pores appear minimized and skin often looks more even and luminous with continued use.

• 15% niacinamide targets oil control and texture refinement
• Zinc PCA helps balance excess sebum for clearer surface appearance
• Six peptides in the toner support firmness and reduce signs of fatigue
• Layering allows focused action without heavy residue

Can I use the Niacinamide 15% Serum and Peptide Booster together in one routine?

Yes — the intended order is peptide booster toner first, then niacinamide serum. The lighter toner preps skin for better absorption of the serum, letting both formulations perform without diluting each other.

• Step 1: After cleansing, apply 2–3 pumps of the Peptide Booster Toner and pat in
• Step 2: Apply 2–3 drops of the Niacinamide 15% Serum to the face
• Step 3: Seal with a moisturizer if additional hydration is needed
• Patch test on the body first; wait 24 hours before full-face use

Who should avoid or be cautious with these actives?

People with very reactive skin or known sensitivities to active ingredients should be cautious and follow the patch-test guidance. If irritation or prolonged redness occurs, discontinue use and consult a healthcare professional. This set is not intended to treat medical conditions but to support cosmetic concerns like texture and radiance.

• Perform a patch test before full-face application
• Start with fewer applications per week to assess tolerance
• Avoid mixing immediately with other strong actives until skin adapts
• If irritation occurs, stop use and seek advice from a doctor

How will this set fit into my morning and evening skincare routine?

The peptide toner and niacinamide serum work well in both AM and PM routines, but always follow with SPF in the morning. Use the toner first to hydrate and prepare, then the serum to address oil control and texture. Adjust frequency based on sensitivity: daily if tolerated, or alternate nights if your skin is new to concentrated actives.

• AM: Cleanse → Peptide Booster Toner → Niacinamide Serum → Moisturizer → SPF
• PM: Cleanse → Peptide Booster Toner → Niacinamide Serum → Moisturizer
• Reduce frequency when combining with retinoids or exfoliating acids
• Monitor skin for dryness or irritation and adapt routine accordingly

Who is this for: The COSRX Niacinamide 15% Peptide Booster Set is aimed at people wanting to refine pores, balance oiliness, and boost skin elasticity without heavy creams. It's ideal for someone experienced with actives who wants a layering approach—those seeking brighter, smoother-looking skin and open to doing a patch test before first full-face use. If you have highly sensitive or reactive skin, introduce the duo slowly or consult a skincare professional first.

Ingredients

15% Niacinamide with Zinc PCA, 6 Peptides with Hyaluronic Acid And Allantoin