No. 5 Goodbye Blemish Serum
No. 5 Goodbye Blemish Serum
Product Description
Product overview
A vitamin-packed brightening serum with 75% Sea Buckthorn (Vitamin Tree) Extract that targets dark spots, acne scars, and hyperpigmentation while delivering a gentle, non-irritating formula suitable for daily use on most skin types.
75% Vitamin Tree Extract
Sea Buckthorn (Hippophae Rhamnoides) delivers antioxidants, vitamins C & E naturally to brighten and protect skin.
Texture & feel
SENSORY75% Vitamin Tree Extract
Sea Buckthorn (Hippophae Rhamnoides) delivers antioxidants, vitamins C & E naturally to brighten and protect skin.
Triple Vitamin C System
Combines Ascorbic Acid, Ascorbyl Glucoside, and 3-O-Ethyl Ascorbic Acid for stable, effective brightening.
Niacinamide (Vitamin B3)
Helps reduce hyperpigmentation, supports skin barrier, and regulates sebum production.
Panthenol + Hyaluronic Acid
Provides deep hydration and supports skin healing for plump, moisturized skin.
Safety & compatibility
SAFEContains Licorice Root Extract which should be used with caution during pregnancy. Consult your healthcare provider before use.
Contains Polyglyceryl-10 Laurate which may not be fungal acne safe. Patch test recommended for FA-prone skin.
Rated 1/5 - very low chance of clogging pores. Suitable for most acne-prone skin types.
Contains lemon, orange, and lime peel oils. May cause photosensitivity - always use SPF during the day.
Ingredient breakdown
INGREDIENTSHippophae Rhamnoides Extract 75%Hero Ingredient
Sea Buckthorn (Vitamin Tree) Extract is rich in vitamins C, E, carotenoids, and essential fatty acids. It provides powerful antioxidant protection and supports skin healing.
- Vitamin Content: Contains 10x more Vitamin C than oranges
- Benefit: Brightens, protects against environmental damage, supports collagen production
- Source: Derived from sea buckthorn berries
Niacinamide (Vitamin B3) ~2%Proven
A multi-tasking ingredient proven to reduce hyperpigmentation, minimize pores, strengthen the skin barrier, and regulate oil production.
- Clinical Evidence: Studies show 2-5% concentration effective for skin barrier and tone evening
- Benefit: Fades dark spots, reduces inflammation, balances sebum
- Compatibility: Works well with most ingredients except pure Vitamin C at the same time
Triple Vitamin C Complex LowStabilized
Combines three forms of Vitamin C: Ascorbic Acid (pure), Ascorbyl Glucoside, and 3-O-Ethyl Ascorbic Acid for enhanced stability and efficacy.
- 3-O-Ethyl Ascorbic Acid: Stable derivative that converts to Vitamin C in skin
- Ascorbyl Glucoside: Water-soluble, gentle form suitable for sensitive skin
- Benefit: Brightens, boosts collagen, protects against free radicals
Panthenol (Pro-Vitamin B5)Soothing
A powerful humectant that attracts and retains moisture while supporting wound healing and skin barrier repair.
- Penetration: Absorbs deeper into skin than many humectants
- Benefit: Hydrates, soothes irritation, promotes healing
Centella Asiatica ExtractSoothing
Also known as Cica or Gotu Kola, this botanical extract is renowned for its wound healing and anti-inflammatory properties.
- Active Compounds: Madecassoside, asiaticoside support collagen synthesis
- Benefit: Calms redness, promotes healing, strengthens skin barrier
39 ingredients
Hippophae Rhamnoides Extract, Butylene Glycol, Methyl Gluceth-20, Dipropylene Glycol, Glycerin, 1,2-Hexanediol, Niacinamide, Melia Azadirachta Flower Extract, Ocimum Sanctum Leaf Extract, Melia Azadirachta Leaf Extract, Curcuma Longa (Turmeric) Root Extract, Corallina Officinalis Extract, Citrus Limon (Lemon) Peel Oil, Citrus Aurantium Dulcis (Orange) Peel Oil, Citrus Aurantifolia (Lime) Oil, Polygonum Cuspidatum Root Extract, Scutellaria Baicalensis Root Extract, Camellia Sinensis Leaf Extract, Glycyrrhiza Glabra (Licorice) Root Extract, Chamomilla Recutita (Matricaria) Flower Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Centella Asiatica Extract, Ascorbyl Glucoside, Ascorbic Acid, 3-O-Ethyl Ascorbic Acid, Panthenol, Sodium Hyaluronate, Dipotassium Glycyrrhizate, Glycereth-26, Ammonium Acryloyldimethyltaurate/VP Copolymer, Polyglyceryl-10 Laurate, Carbomer, Allantoin, Tromethamine, Water, Hydrolyzed Jojoba Esters, Disodium EDTA, Citral, Limonene
Where it fits in your routine
ROUTINEApply after cleansing and toner, before heavier creams. Can be layered 2-3 times for intensive care. Always follow with SPF in the morning.
How to use
HOW TO USEDispense
Pump 2-3 drops of serum onto clean fingertips after cleansing and toning.
Apply
Gently spread the serum across your entire face, focusing on areas with dark spots or uneven tone.
Pat In
Lightly pat with fingertips to aid absorption. For intensive treatment, apply a second layer after the first absorbs.
Follow Up
Continue with moisturizer. In the morning, always finish with sunscreen SPF 30+.
Who is it for?
WHOPerfect for you if:
- You have post-acne marks or hyperpigmentation
- You want gentle, daily brightening care
- You have acne-prone or oily skin
- You're looking for a lightweight, fast-absorbing serum
- You want to even out your skin tone gradually
- Pure Vitamin C serums irritate your skin
Consider alternatives if:
- You need intensive, high-concentration Vitamin C treatment
- You have fungal acne and react to laurates
- You're pregnant or breastfeeding (consult doctor first)
- You're sensitive to citrus essential oils
- You expect overnight dramatic results
Skin type compatibility
SKIN TYPESLightweight gel absorbs quickly without adding shine. Niacinamide helps regulate sebum production.
Balances well across different face zones. Hydrates dry areas without overwhelming oily zones.
Low comedogenic rating, helps fade acne scars. Contains anti-inflammatory botanicals.
Provides hydration with panthenol and hyaluronic acid, but may need a richer moisturizer on top.
Generally gentle, but contains citrus essential oils. Patch test first; some may need to use 2-3 times weekly.
Results timeline
WEEK 8+Improved Hydration & Texture
Skin feels more hydrated and smoother. Some users notice a subtle glow and improved skin texture.
70% noticed within 2 weeksReduced Redness & Faster Healing
Active acne heals faster, redness begins to diminish. Fresh post-acne marks start to fade.
65% noticed improvementVisible Brightening
Noticeable fading of dark spots and hyperpigmentation. Overall skin tone appears more even and radiant.
80% noticed visible brighteningLong-Term Results
Continued improvement in skin clarity and tone. Best results seen with consistent daily use over 2-3 months.
85% reported satisfactionRatings by platform
880+ REVIEWSPros & cons
BALANCEDPraised
- Lightweight gel texture absorbs quickly
- Effective at fading post-acne marks over time
- Doesn't cause breakouts for most users
- Gives skin a healthy, dewy glow
- Multiple repurchases reported
- Gentle enough for daily use
- Good value for K-beauty quality
- Works well under makeup
Criticized
- Results require patience (4-8 weeks)
- Some sensitive users experience irritation with daily use
- Contains citrus essential oils (potential photosensitivity)
- 50ml bottle may not last long with twice-daily use
- Not fungal acne safe for all users
- Lower Vitamin C concentration than dedicated serums
Budget-friendly alternatives (dupes)
DUPESHigher niacinamide concentration (10% vs ~2%), no Vitamin C or botanical extracts. Simpler formula, may be too strong for some. More oil-control focused.
Also K-beauty, 10% Niacinamide + 83% Yuja Extract. Higher niacinamide concentration, includes glutathione and arbutin. Similar brightening focus.
5% Vitamin C (stable form), gentler formula. Better for sensitive skin. Less focus on blemishes, more on overall brightening.
High-strength 23% Vitamin C for intensive treatment. More potent but potentially more irritating. Better for stubborn pigmentation.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening
Store in a cool, dry place away from direct sunlight. Refrigeration optional but extends freshness.
Pump bottle - hygienic dispensing, protects product from air exposure
Yes, 50ml is under 100ml carry-on limit
Frequently asked questions
FAQUse with caution. This serum contains Licorice Root Extract (Glycyrrhiza Glabra), which is generally advised to be used in moderation during pregnancy due to potential effects at high doses. The topical concentration in cosmetics is typically low, but we recommend consulting your healthcare provider before use during pregnancy or breastfeeding.
This serum may not be 100% fungal acne safe. It contains Polyglyceryl-10 Laurate, which some fungal acne databases flag as a potential trigger. However, many users with fungal acne-prone skin report no issues, likely due to low concentrations. We recommend patch testing first if you're prone to fungal acne.
Yes, but with care. The serum already contains mild Vitamin C derivatives, so adding a high-strength Vitamin C serum may cause irritation. For retinol, use them at different times (serum in AM, retinol in PM). For AHA/BHA, introduce slowly and avoid using both on the same day initially. Listen to your skin and reduce frequency if irritation occurs.
This serum works excellently for oily, combination, and acne-prone skin due to its lightweight gel texture and niacinamide content. It's also good for dry skin when layered with a moisturizer. Sensitive skin types may need to use it 2-3 times weekly rather than daily due to the citrus essential oils.
Most users report improved skin texture and hydration within 1-2 weeks. Visible brightening and fading of dark spots typically appears around 4-8 weeks with consistent daily use. For stubborn hyperpigmentation, allow 2-3 months of regular use. Remember that skin cell turnover takes about 28 days.
Apply after cleansing and toner, before moisturizer. The general rule is thin to thick consistency. This serum is water-based and lightweight, so it should go early in your routine. For AM: Cleanser → Toner → This Serum → Moisturizer → Sunscreen. For PM: Cleanser → Toner → This Serum → Moisturizer.
This serum has a low comedogenic rating of 1/5, meaning it has a very low chance of clogging pores. It's formulated without heavy oils and silicones. Most users with acne-prone skin report no breakouts, and many actually see improvement in their acne. However, everyone's skin is different, so patch testing is always recommended.
The serum has a PAO (Period After Opening) of 12 months. The 50ml bottle typically lasts 1.5-2 months with twice-daily use (2-3 pumps per application). Store in a cool, dry place away from direct sunlight to maintain potency. The pump packaging helps protect the product from air and contamination.
Verdict: Numbuzin No. 5 Goodbye Blemish Serum is an excellent choice for those seeking gentle, daily brightening care. With its 75% Vitamin Tree Extract and triple Vitamin C complex, it effectively fades post-acne marks and hyperpigmentation over time without the irritation of high-strength actives. The lightweight gel texture is perfect for oily and combination skin, though sensitive skin users should introduce it gradually. While not a quick fix and not the highest-concentration option available, it delivers reliable results for those willing to commit to consistent use. An impressive value in the K-beauty brightening serum category.
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Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Butylene Glycol
Solvent, Skin Conditioning, Masking, Fragrance, Humectant, Viscosity Controlling, Viscositydecreasing Agent
|
Hydrating
|
|
| 1 |
Methyl Gluceth-20
Humectant, Moisturising
|
|
|
| 1 |
Dipropylene Glycol
Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling
|
|
|
| 2 |
Glycerin
Solvent, Perfuming, Fragrance, Humectant, Viscosity Decreasing Agent, Hair Conditioning, Skin Protecting, Denaturant, Skin Conditioning
|
Promotes Wound Healing
Hydrating
|
|
| 1 |
1,2-Hexanediol
Solvent, Skin Conditioning
|
Hydrating
|






