Shiratama #5 Glutathione | Vitamin C | Niacinamide | Pigmentation & Dull Skin Care Serum | 30ml

🧴 What It Is

A Korean skincare serum designed to brighten hyperpigmentation, fade dark spots, and even skin tone. Its key actives include glutathione, vitamin C derivative, niacinamide, and tranexamic acid .

✨ Key Benefits

Targeted brightening action: Combines 98% pure glutathione with tranexamic acid, niacinamide, vitamin C, E, and CoQ10 to address dark spots, pigmentation, and dullness .

Clinically backed performance: Shown to improve skin texture and brightness in as little as two weeks; dark spots reduced by ~9.6% and tone improved ~18.9% after 4 weeks in studies .

Gentle & suitable for all skin types: Hypoallergenic and tested on sensitive skin; fragrance-free .

Lightweight texture: Fast-absorbing serum with no greasy residue; adds hydration with panthenol and ceramides .

🔍 Active Ingredients

Ingredient Role & Concentration*

Glutathione 100 ppm antioxidant that inhibits excess melanin production
Niacinamide 5% brightener (50,000 ppm), boosts complexion radiance and barrier health
Tranexamic acid 4% tyrosinase inhibitor to further reduce pigment
3-O-Ethyl Ascorbic Acid Stable vitamin C derivative (2,000 ppm) for antioxidant and brightening support
Panthenol & Ceramide NP Soothing hydration and barrier reinforcement
Coenzyme Q10, alpha-arbutin, botanical extracts Boosts antioxidant richness and skin tone.

How to Use

1. Apply 2–3 drops after cleansing and toning, both morning and evening.

2. For stubborn spots, add an extra drop to the specific area .

3. Follow with moisturizer and always use sunscreen during the day.

User Feedback

From r/AsianBeauty:

> “They are marketing it as a 'glutathione' serum, even though it only contains 100 ppm… the heavy‑lifting is by 5% niacinamide” .
“I’ve repurchased this about 3 times… it’s only great for fresh acne… evening skin tone though” .

Summary of user experiences:

Glutathione concentration is low, mainly used for marketing, while niacinamide and tranexamic acid are stronger actives.

Effective at calming inflammation and preventing fresh acne from leaving dark marks, though older pigmentation may not fully fade.

Sensitivity to scent reported—despite being labeled fragrance-free, some detected a mild smell.

✅ Pros & Cons

👍 Pros:

Lightweight, fast-absorbing texture

Effective brightening complex

Good for oily, combination, and sensitive skin

Backed by clinical data

🧭 Who It’s For

Ideal for those with fresh post‑acne marks, uneven tone, or mild pigmentation who want a gentle, multi-active serum.

Great during transitional seasons or for skin calming/daily maintenance routines.

Users seeking dramatic depigmentation might need to combine it with exfoliants or stronger actives.

💡 Tips

Pair with exfoliating acid toners, retinoids, or in‑clinic treatments for best results.

Always wear broad‑spectrum sunscreen daily to prevent pigment recurrence.

In essence, Numbuzin No.5+ is a well‑balanced, Korean brightening serum that blends antioxidants with proven tone‑evening ingredients. It excels at calming and preventing new pigment but may need support from stronger treatments to tackle stubborn hyperpigmentation.