++++
[ DemythSkin Verdict ]

Numbuzin No.5 Goodbye Blemish Serum
SerumAcne, hyperpigmentation, skin barrier support
Efficacy
Strong
4.2 / 5.0
Safety
Safe
4.4 / 5.0
System Verdict
A hydrating, antioxidant-rich serum with solid actives undermined by fragmentation of vitamin C and excessive botanical overload that dilutes efficacy. The formula contains three vitamin C derivatives (Ascorbic Acid, 3-O-Ethyl Ascorbic Acid, Ascorbyl Glucoside) positioned mid-to-late in the INCI list, suggesting sub-optimal concentrations for meaningful brightening—the pure Ascorbic Acid is present but likely below the clinically effective 10-15% threshold needed for visible results. Niacinamide at 1.5-2.3% is therapeutic but modest. The 75% "Vitamin Extract" claim refers to Hippophae Rhamnoides Extract (seabuckthorn), which is positioned first but is a botanical complex, not a standardized active—its actual bioavailable vitamin C content is unknown and likely minimal. The formula is heavily weighted toward soothing plant extracts (licorice, turmeric, centella, chamomile, rosemary, green tea) that provide antioxidant and anti-inflammatory benefits but lack clinical depth for acne treatment. Citrus peel oils (Limon, Aurantium Dulcis, Aurantifolia) add fragrance and potential photosensitivity risk. The serum lacks acne-fighting actives like salicylic acid, azelaic acid, or benzoyl peroxide, making it better suited for post-acne hyperpigmentation and barrier support than active blemish control. Packaging (assumed opaque bottle) is appropriate for vitamin C stability. Overall, this is a gentle, hydrating serum with antioxidant support but falls short of clinical efficacy for acne-prone skin.
Active Ingredients Detected
S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative
Ascorbic Acid3-O-Ethyl Ascorbic Acid
A Tier: Good BasicsProven Results
NiacinamideAscorbyl GlucosidePanthenolSodium HyaluronateAllantoin
B Tier: Supporting IngredientsPromising Ingredients
Hippophae Rhamnoides ExtractButylene GlycolCentella Asiatica ExtractCamellia Sinensis Leaf ExtractDipotassium Glycyrrhizate
C Tier: Marketing IdolsHype | Limited or Weak Data
Glycyrrhiza Glabra Root ExtractCurcuma Longa Root ExtractRosmarinus Officinalis Leaf Extract
Analyze on DemythSkin →
DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.