numbuzin No.5 Vitamin Concentrated Serum Dupes & Cheaper Alternatives
From 110 Reddit threads · Updated October 17, 2026
Tranexamic acid targets dark spots; Reddit approves, studies support niacinamide for acne. The catch: Breakouts, cystic acne, and closed comedones hit some users. Here's what Redditors reach for instead.
The short answer
Best Cheaper AlternativeWatery, fast-absorbing centella · $6.00 · 30 ml vs $17.00 for the original
Best for Hyperpigmentation15% L-ascorbic acid formula; vitamin C benchmark · $147.96 · 30 ml
#1
Best Overall Alternative
The why
One minus
Oily feel can linger and pill under other layers
Good forDry Skin
Both recommended for Hyperpigmentation; discussed alongside numbuzin No.5 Vitamin Concentrated Serum in 17 threads.
“Have you tried melano cc vit c serum?”
— Reddit, r/SkincareAddiction
The original, at a glance
- Why people love it
- Dark-spot favorite featuring tranexamic acid and niacinamide
- Price
- $17.00 · 29.9 ml · $0.57/ml
#2
Best Cheaper Alternative
- Size: 30 ml
- Price per ml: $0.20/ml (original $0.57/ml)
The why
A watery centella ampoule that people use before moisturizer or tret. It suits irritated, dehydrated, or barrier-damaged skin. On very reactive faces, it can sting, break out, or do basically nothing.
One minus
Can trigger closed comedones or whiteheads
Good forSensitive Skin, Dry Skin
Both recommended for Redness / Irritation; discussed alongside numbuzin No.5 Vitamin Concentrated Serum in 9 threads.
“I am in love with SKIN1004 centella ampule as its the most soothing product i use and my skin loves it’s lightweight watery texture.”
— Reddit, r/Rosacea
#3
Best for Hyperpigmentation
- Size: 30 ml
- Price per ml: $4.93/ml (original $0.57/ml)
The why
A 15% L-ascorbic acid serum paired with tocopherol and ferulic acid for morning brightening and photoaging support. It suits experienced vitamin-C users chasing stubborn pigmentation, but reactive or oily skin may face stinging, tackiness, breakouts, and rapid oxidation.
One minus
15% strength stings reactive skin and can worsen redness
Good forDry Skin, Sensitive Skin
Both recommended for Acne; discussed alongside numbuzin No.5 Vitamin Concentrated Serum in 5 threads.
“Changes: Added CE Ferulic + tretinoin + tinted SPF”
— Reddit, r/40plusskincare
#4
Best for Dehydration
- Size: 30 ml
- Price per ml: $0.62/ml (original $0.57/ml)
The why
A hyaluronic acid serum with panthenol and glycerin that people mainly use for dehydration and post-retinoid tightness. Best on damp skin under moisturizer, especially if your barrier is cranky. Dry climates and heavy layering can make it feel sticky or useless.
One minus
Sticky, tacky, and prone to pilling
Good forDry Skin, Sensitive Skin
Both recommended for Dehydration.
“used Avene with The Ordinary's Hyaluronic Acid 2%+B5 day and night”
— Reddit, r/tretinoin
Other alternatives worth a look
10% OTC azelaic acid; studies support the active for acne · 750 mentions
Sensitive SkinGentle
10% niacinamide + 4% tranexamic acid brightening combo · 153 mentions
Dark SpotsBrightening
Oil control and pore shrinkage · 576 mentions
Sebaceous FilamentsAcne Scarring
Watery toner-like texture; layers under everything · 152 mentions
Sensitive SkinUnder Makeup
23% pure ascorbic acid — serious brightening power · 62 mentions
Dark SpotsBrightening
Hydration monster for tight, flaky skin · 365 mentions
Sensitive SkinNiacinamide-Free
Multi-weight HA blend for fast, layered hydration · 279 mentions
Sensitive SkinAlcohol-Free
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Reddit's best serums by concern, skin type or ingredient list
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