ProtoClinical k-beauty K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml in a single golden-yellow bottle, centered upright on a pale lavender background
ProtoClinical k-beauty K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml in a single golden-yellow bottle, centered upright on a pale lavender background
ProtoClinical k-beauty K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml as a single golden-yellow serum bottle centered upright on a pale lavender background
ProtoClinical k-beauty K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml as a single golden-yellow serum bottle centered on a pale blue and cream background
K-SECRET

K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml

$26.20
Brightens dull skin Helps even tone Hydrates dry texture Improves radiance Supports smoother skin
This is a high-potency vitamin tone-improving serum that targets dullness, dryness, uneven tone, and rough skin texture at the same time. Formulated with 15% high-concentration niacinamide and yuzu extract, it helps support brightening, anti-aging care, tone evenness, and hydration for an overall radiant complexion. The lightweight, hydrating texture...
A high-strength glow serum for dull, dry skin that needs more clarity and luminosity.
100% authentic

Sourced direct · batch code

30-day returns

Unopened, no quibble

15% Niacinamide Yuja Glow Care Tone-Improving Serum Hydrating Brightening
niacinamide yuja extract
K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml
K-SECRET SEOUL 1988 GLOW SERUM : NIACINAMIDE 15% + YUJA 30ml Default Title
$26.20
Clinically proven actives Dermatologist tested 100% authentic Korean Cruelty-free
Pairs beautifully with

Complete the routine

Build your routine Tick products to add them with this one
$26.20

niacinamide and yuja extract

Niacinamide works at the junction between melanocytes and keratinocytes, intercepting melanin transfer before pigment reaches the visible surface. It simultaneously boosts ceramide synthesis to strengthen the lipid barrier, which is why consistent use addresses both discoloration and dehydration. In K's serum, Niacinamide targets dehydration, delivering visibly brightens skin tone and fades uneven patches with consistent use.

Niacinamide 15%
intercepts melanin transfer to fade spots and refine pore texture from within
The texture

Lightweight, absorbing serum

This is a high-potency vitamin tone-improving serum that targets dullness, dryness, uneven tone, and rough skin texture at the same time. Formulated with 15% high-concentration niacinamide and yuzu extract, it helps support brightening, anti-aging care, tone evenness, and hydration for an overall radiant complexion. The lightweight, hydrating texture is suitable for all skin types, and is especially ideal for dull, dry skin, leaving it looking clearer, more luminous, and comfortably moisturized with a healthy glow.

All Skin Types Dry Skin dullness uneven skin tone rough texture dehydration
Hover the swatch: it ripples like water

How to use

1

Apply after toner.

2

Spread evenly over face and neck.

3

Pat in until absorbed.

4

Follow with moisturizer and daytime sunscreen.

Full transparency

Ingredients

15% niacinamide and yuja extract support tone-evening, radiance, and hydrated glow.

K-SECRET SEOUL 1988 Glow Serum is built around a strong niacinamide-led brightening story, supported by yuja extract for added radiance. At 15%, niacinamide is positioned here as the main tone-improving driver, which fits the product's focus on dullness, uneven-looking skin, and rough texture. That ingredient is especially useful because it can target visible tone issues while also supporting barrier comfort, making the formula feel more balanced than a purely exfoliating brightener. Yuja extract adds a fresh antioxidant layer that helps reinforce the glow positioning. The hydrating serum base matters too, because brightening routines are easier to maintain when they do not leave the skin feeling dry or tense. In practical terms, this formula is about clearer, brighter, more luminous skin rather than an abrasive resurfacing effect. Overall, the science story is high-strength tone care paired with hydration so radiance looks healthier and more even over time. That keeps the glow result from reading dry or overprocessed.

The detail

Specs & details

FormatLightweight serum
SizeDefault Title
Skin typesAll Skin Types, Dry Skin
Country of originSouth Korea
Before you add to cart

Questions & answers

After cleansing and toning, before moisturizer. Serums deliver actives most effectively on freshly prepped skin.
Yes. Apply from thinnest to thickest consistency and allow each layer to absorb before the next.
Most users notice initial improvement within 2 to 4 weeks. For full benefits like visibly brightens skin tone and fades uneven patches, allow 6 to 8 weeks of consistent use.
Your skin begins adjusting. You may notice improved hydration and comfort before more visible changes like texture refinement become apparent.
Yes, this formula is developed to be compatible with all skin types dealing with dehydration. If you have very reactive skin, patch test on the inner arm before full application.
The formula is designed to be well-tolerated. For pregnancy-specific concerns, consult your healthcare provider. For sensitive skin, patch test before full application.
Niacinamide intercepts melanin transfer to fade spots and refine pore texture from within. Consistent daily use is key to seeing the full benefits.
Check the INCI list for the most accurate information on fragrance components. The formula is developed for minimal irritation potential.
Store in a cool, dry place away from direct sunlight. Use within 12 months of opening for optimal freshness and efficacy.
Serums have a higher concentration of targeted actives than essences and a lighter consistency than most ampoules. They deliver the most potent treatment in your routine.
You may also like

More clinical glow

K-SECRET
About the brand

OriginSeoul, KR
Shop all →