— · Serum
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4.7
523 reviews
Rating breakdown
Most-mentioned keywords
Why consumers buy
Repurchase/loyalty
An extremely high share of reviews explicitly state this is a 2nd-6th+ repurchase, indicating strong repeat-buy behavior and brand loyalty within the numbuzin No.1 line.
Refill set value
Many buyers cite the bundled refill pouch as a key reason to buy, since it lowers per-use cost and reduces plastic packaging.
Word of mouth / social media reputation
Several reviewers mention buying because of SNS, influencer, or online review buzz claiming it helps with sebum, redness and acne.
Ingredient reputation (Pantothenic acid/B5)
Buyers with oily or acne-prone skin specifically sought out a pantothenic acid-based serum, noting this line is one of the few well-known B5-focused options.
Gifting/family use
Multiple reviewers bought it for family members (teenage sons/daughters, sisters) dealing with acne, suggesting appeal as a gift or shared household product.
How they use it
First step serum
Many use it as the first serum after toner/cleansing, describing it as a 'base-building' or 'first serum' step in their routine.
Morning and/or night use
Skin concerns raised — and how the product addressed them
✓Most reviewers report fewer, smaller, or faster-healing breakouts with continued use, though a minority saw no change.
✓Many oily-skin users say it controls shine and reduces midday oiliness, though some heavy oil-producers felt it wasn't strong enough.
✓Reviewers with sensitive or barrier-compromised skin frequently say it calms irritation without stinging, often used alongside actives like retinol.
Points to note
Sentiment breakdown
Share of analyzed reviews by overall sentiment.
Reviewers commonly apply it both AM and PM, though some use it only in the morning before makeup for its quick-absorbing, non-sticky finish.
Paired with same-line powder/cream
A frequent pattern is combining this serum with the numbuzin No.1 drying powder or cream for spot treatment on active breakouts.
Layered with actives
Several users apply it alongside or after retinol, tretinoin, or niacinamide to buffer irritation and dryness from active ingredients.
Seasonal, especially summer use
Many describe it as ideal for hot/humid months due to its light, oil-absorbing watery texture, with some noting it feels insufficient alone in drier seasons.
✓Several reviewers note visibly reduced redness after regular use, particularly around active breakouts.
✓Inner-dry and combination skin users say it hydrates without adding oil, though some feel it's not enough moisture alone and require layering.
Concerns and outcomes summarized from reviews; percentages are approximate.
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