Zinc PCA Facial Serum
Zinc PCA Facial Serum
Product Description
Product overview
A lightweight, pore-refining facial serum by Q+A that harnesses the power of Zinc PCA alongside a fermented Reishi and Shiitake Mushroom complex to balance sebum, minimise pore appearance, reduce blemish-related redness, and support skin firmness — without stripping or drying the skin.
Pore Minimising
Zinc PCA actively regulates excess sebum and tightens the look of enlarged pores, keeping skin visibly refined throughout the day.
Texture & feel
SENSORYPore Minimising
Zinc PCA actively regulates excess sebum and tightens the look of enlarged pores, keeping skin visibly refined throughout the day.
Mushroom Anti-Ageing Complex
Fermented Reishi (Ganoderma Lucidum) and Shiitake (Lentinus Edodes) extracts deliver antioxidant and skin-firming benefits inspired by Japanese skincare traditions.
Hydration Without Heaviness
Betaine, Glycerin, and Biosaccharide Gum-1 work as humectants to draw moisture into the skin without adding grease or weight.
Blemish-Calming Botanicals
Honeysuckle extract (Lonicera Caprifolium & Lonicera Japonica) provides natural antimicrobial and soothing properties to calm redness around blemishes.
Probiotic Skin Support
Lactobacillus Ferment and Leuconostoc/Radish Root Ferment Filtrate help maintain a healthy skin microbiome and reinforce the skin's natural barrier.
Vegetable Collagen for Firmness
Plant-derived Collagen improves the appearance of skin elasticity and plumpness, making it an ethical, vegan-friendly alternative to animal collagen.
Safety & compatibility
SAFEThis formula contains no retinoids, salicylic acid, hydroquinone, or chemical sunscreen actives. All ingredients are generally regarded as safe during pregnancy and nursing. Always consult your healthcare provider for personal guidance.
This serum contains multiple ferment filtrates (Lactobacillus Ferment, Leuconostoc/Radish Root Ferment Filtrate, and the mushroom ferment complex). Fermentation-derived ingredients may feed Malassezia yeast. Those with fungal acne are advised to patch test carefully or choose a ferment-free alternative.
Zinc PCA is actively sebum-reducing and anti-comedogenic. No high-comedogenic oils or occlusive butters are present. Propylene Glycol (rating ~0) and Glycerin are both non-pore-clogging. Overall comedogenic risk is very low.
Contains no synthetic fragrances, perfumes, or drying alcohols (no ethanol, denatured alcohol, or isopropyl alcohol). Safe for fragrance-sensitive and reactive skin types.
Lactic acid appears low on the INCI list at a likely low concentration (below 1%). It provides gentle exfoliation and microbiome support but may cause mild sensitivity in very reactive skin. Patch test recommended before full application.
Q+A is certified cruelty-free — no animal testing at any stage. The Collagen in this formula is plant-derived (Hydrolyzed Vegetable Protein), making it fully vegan-friendly.
Zinc PCA and niacinamide have complementary sebum-regulating and pore-refining effects. Users report enhanced results when combining this serum with a niacinamide product. Avoid pairing with high-strength AHA/BHA exfoliants in the same routine step.
Propylene Glycol appears as the second ingredient and at higher concentrations can cause irritation in sensitive skin. If you have known sensitivity to this ingredient, a patch test is strongly recommended before use.
Ingredient breakdown
INGREDIENTSZinc PCA ~1%Proven
The star active ingredient — a synergistic salt combining zinc with L-PCA (pyrrolidone carboxylic acid, a Natural Moisturizing Factor). Zinc targets sebum overproduction and acne-causing bacteria, while L-PCA enhances zinc's bioavailability and delivers hydration simultaneously.
- Sebum control: Manufacturer in-vivo data shows statistically significant reduction in sebum production after 28 days at 1% concentration.
- Antimicrobial: In-vitro studies show strong activity against P. acnes bacteria at 0.1–0.25%.
- Anti-aging potential: A 2011 research paper indicates Zinc PCA may stimulate Type I collagen synthesis in vitro.
- Pore appearance: Regulates sebum that contributes to dilated pores, making skin appear more refined over time.
Lactobacillus/Ganoderma Lucidum Extract/Lentinus Edodes Extract Ferment Filtrate 3rd positionProven
A tri-fermented complex combining Lactobacillus fermentation with Reishi Mushroom (Ganoderma Lucidum) and Shiitake Mushroom (Lentinus Edodes) extracts. This fermentation process enhances bioavailability of the mushroom actives for skin delivery. Reishi is renowned in traditional East Asian medicine for anti-inflammatory and adaptogenic properties.
- Reishi (Ganoderma Lucidum): Contains beta-glucans and triterpenoids with antioxidant and anti-inflammatory properties; studied for reducing skin redness and supporting elasticity.
- Shiitake (Lentinus Edodes): Rich in kojic acid precursors and lentinan, supporting cell turnover and a more even skin tone.
- Fermentation benefit: Fermentation breaks down molecules for better skin absorption and adds postbiotic skin-barrier benefits.
Betaine 4th positionProven
Naturally derived from sugar beet, Betaine is a multifunctional humectant and osmoprotectant. It draws water into the upper layers of the skin and helps balance moisture levels without adding oiliness — making it especially valuable for combination and oily skin types that still need hydration.
- Humectant: Binds water molecules to maintain skin hydration throughout the day.
- Skin-smoothing: Improves skin texture and softness with regular use.
- Low irritation: Well-tolerated even by sensitive skin; often used in place of potentially irritating humectants.
Lonicera Caprifolium Extract & Lonicera Japonica Callus Extract Mid-listPromising
Two honeysuckle-derived extracts valued for their natural antimicrobial and anti-inflammatory properties. Lonicera Japonica (Japanese Honeysuckle) contains chlorogenic acid and luteolin, which exhibit antibacterial activity against acne-causing organisms. Used as a gentle, plant-based preservative booster and skin soother.
- Antimicrobial: Active against Staphylococcus epidermidis and P. acnes strains in lab studies.
- Anti-inflammatory: Luteolin content helps calm redness and reactive skin conditions.
- Natural preservation: Assists the preservative system, extending product shelf life naturally.
Lactobacillus Ferment Mid-listPromising
A probiotic-derived postbiotic ingredient created by fermenting Lactobacillus bacteria. It supports the skin's natural microbiome, reinforces the skin barrier, and has demonstrated DNA-repair enzyme activity in research. Valuable for acne-prone skin where microbiome diversity is often disrupted.
- Barrier support: Studies show Lactobacillus ferment can repair compromised skin barriers.
- Microbiome balance: Functions as a prebiotic/postbiotic to support good bacterial diversity.
- DNA repair: Referenced in a 2009 Estée Lauder patent for environmental protection and DNA repair enzyme activity.
Biosaccharide Gum-1 Mid-listProven
A biotechnology-derived ingredient produced by fermenting sorbitol. Functions as a long-lasting hydration film-former on the skin surface, locking in moisture and providing a protective biopolymer layer. Also has soothing properties beneficial for sensitive and irritated skin.
- Film-forming humectant: Creates a water-binding film on skin that provides prolonged hydration vs standard humectants.
- Soothing: Studied for calming effects on reactive and sensitized skin.
Collagen (Plant-Derived) Mid-listPromising
Q+A uses vegetable-derived Collagen (Hydrolyzed Vegetable Protein) — a vegan alternative to animal collagen. While topically applied collagen cannot penetrate deeply enough to replace dermal collagen, it forms a film on the skin's surface to temporarily improve firmness, elasticity, and plumpness. Also functions as a humectant.
- Surface film-forming: Temporarily tightens and smooths the appearance of skin.
- Hydration: Acts as a humectant and moisture-retention agent.
- Vegan-friendly: Derived entirely from plant sources, no animal by-products.
Lactic Acid Low concentrationProven
An alpha-hydroxy acid (AHA) derived from milk or fermentation. At low concentrations (as used here), lactic acid gently exfoliates dead skin cells, improves skin texture, and supports a healthy skin microbiome. It is the mildest common AHA, making it well-suited to sensitive skin compared to glycolic acid.
- Exfoliation: Loosens dead skin cell bonds for brighter, smoother skin.
- Microbiome support: Recent studies suggest low-concentration lactic acid supports beneficial skin bacteria.
- NMF support: Converts partially to PCA in skin, contributing to natural moisturizing factor levels.
19 ingredients
Water, Propylene Glycol, Lactobacillus/Ganoderma Lucidum Extract/Lentinus Edodes Extract Ferment Filtrate, Betaine, Pentylene Glycol, Zinc PCA, Lactobacillus Ferment, Lonicera Caprifolium Extract, Lonicera Japonica Callus Extract, Lactic Acid, Glyceryl Caprylate, Biosaccharide Gum-1, Collagen, Glycerin, Leuconostoc/Radish Root Ferment Filtrate, Sodium Levulinate, Sodium Anisate, Sodium Gluconate, Xanthan Gum
Where it fits in your routine
ROUTINEApply to clean, dry skin after toning and before moisturiser. Use morning and night. When layering, apply thinner/water-based serums before heavier ones. Always follow with SPF in the morning, especially as the formula contains a low dose of AHA (lactic acid).
How to use
HOW TO USECleanse Your Face
Start with a gentle, pH-balanced cleanser to remove makeup, sunscreen, and impurities. Pat your skin dry with a clean towel — do not rub.
Apply Toner (Optional)
If using a hydrating or balancing toner, apply first and allow it to absorb before proceeding to the serum.
Dispense 2–3 Drops of Serum
Using the glass pipette, dispense 2–3 drops onto your fingertips or directly onto the face. A little goes a long way with this concentrated formula.
Press & Pat Into Skin
Gently press and pat the serum into the skin — avoid rubbing. Focus on oily zones, enlarged pores, and blemish-prone areas. The serum absorbs in approximately 20–30 seconds.
Follow With Moisturiser
Lock in the serum with your preferred moisturiser. This is important as the humectant ingredients in the serum need an occlusive layer to prevent moisture loss, especially in dry climates.
Apply SPF in the Morning
The presence of lactic acid (AHA) means your skin may have slightly increased UV sensitivity. Always finish your morning routine with a broad-spectrum SPF 30+ sunscreen.
Who is it for?
WHOPerfect for you if:
- You have oily, combination, or acne-prone skin
- Enlarged pores are a primary concern
- You want to reduce shine without a matte, drying finish
- You're dealing with blemishes, redness, or congestion
- You prefer a minimalist, fragrance-free formula
- You're vegan or want cruelty-free skincare
- You want a budget-friendly UK-made serum with effective actives
- You're pregnant and want an acne serum without retinoids or salicylic acid
Consider alternatives if:
- You have confirmed fungal acne (pityrosporum folliculitis) — multiple ferments present
- You have severe cystic acne requiring prescription-strength treatment
- You have known sensitivity to Propylene Glycol
- You want a heavy-duty hydrating serum for very dry skin
- You prefer a pump dispenser over a glass pipette dropper
- You need a large-size format (only available in 30ml)
Skin type compatibility
SKIN TYPESThis serum was designed specifically for oily skin. Zinc PCA directly regulates sebum production, tightens pores, and controls shine — without any heavy occlusive ingredients. Lightweight and fast-absorbing, it won't add greasiness.
One of the best skin types for this formula. Betaine and Glycerin hydrate drier areas while Zinc PCA balances the oily T-zone. Multiple reviewers with combination skin report it as a repeat-purchase staple.
Zinc PCA's antibacterial properties target P. acnes, while honeysuckle extracts soothe redness and lactic acid promotes gentle cell turnover. Non-comedogenic formula (rating 1/5) won't block pores. Multiple users report clearing stubborn breakouts after consistent use.
Fragrance-free, alcohol-free formula is a good baseline for sensitive skin. However, Propylene Glycol at the second ingredient position may cause irritation for some. Patch test before full use. Biosaccharide Gum-1 and honeysuckle add soothing properties.
Dry skin types can still benefit from the hydrating humectants (Betaine, Glycerin, Biosaccharide Gum-1), but should layer a richer moisturiser over the top. The sebum-regulating action of Zinc PCA is less relevant for those with dry skin, though the anti-ageing mushroom complex remains beneficial.
The Reishi mushroom complex and honeysuckle extracts have anti-inflammatory and redness-calming properties. Several users with rosacea report visible reduction in flushing after regular use. Free from common rosacea triggers (fragrance, alcohol, essential oils).
Results timeline
2–3 MONTHSImmediate Balancing & Softer Feel
Within the first few applications, most users notice a smoother skin texture and less surface oiliness. The lightweight formula absorbs cleanly and the skin feels balanced rather than stripped or dehydrated.
~70% noticed within 1 weekVisible Reduction in Blemishes & Redness
Consistent use brings a measurable reduction in active breakouts, blemish-related redness, and congestion. The antibacterial and sebum-regulating effects of Zinc PCA begin to show clearly. Pores may appear visibly smaller, especially in the T-zone.
~65% reported clearer skin by week 4Pore Refinement & Improved Skin Texture
The in-vivo data supporting Zinc PCA references 28 days as the point of statistically significant sebum reduction. At this stage, users typically report noticeably refined pores, more even skin tone, and a healthier-looking complexion overall.
~60% saw pore refinement by week 6Firmer, Balanced Skin with Long-Term Clarity
The mushroom ferment complex and plant collagen contribute to gradual improvements in skin firmness and elasticity over longer use. Skin tone becomes more even, and the frequency of new breakouts is typically reduced significantly. Several users describe this as a permanent routine staple at this point.
~55% reported skin considered "best condition" after 2 monthsRatings by platform
2K+ REVIEWSPros & cons
BALANCEDPraised
- Effective sebum control and pore refinement
- Fragrance-free and alcohol-free — low irritation profile
- Vegan and cruelty-free with 99% naturally derived ingredients
- Lightweight, fast-absorbing, non-greasy texture
- Genuinely calms blemish-related redness
- Affordable price point for an active serum
- Pregnancy-safe formula (no retinoids, no salicylic acid)
- Dermatoloist-recommended for oily and acne-prone skin
- Works well layered with niacinamide products
- Eco-friendly, recyclable glass pipette packaging
Criticized
- Only 30ml — runs out quickly for twice-daily users
- Not suitable for confirmed fungal acne (multiple ferments)
- Propylene Glycol as second ingredient may irritate sensitive skin
- Mildly sticky initial feel reported by some users
- Results take 4–8 weeks of consistent use to fully show
- No travel-size option available
- Glass pipette can be imprecise — may dispense too much product
Budget-friendly alternatives (dupes)
DUPESThe most popular affordable dupe. Niacinamide + Zinc PCA both target sebum, pores, and blemishes. Key difference: higher niacinamide concentration for brightening but lacks the mushroom anti-aging complex and probiotic ferments. Thinner, more watery texture.
Targets the same pore-congestion and acne-prone concerns via BHA (betaine salicylate) exfoliation rather than zinc. More effective for blackheads and clogged pores, but not pregnancy-safe and has higher irritation potential. Does not regulate sebum production the same way.
A premium option with higher-concentration niacinamide for more pronounced brightening and pore refinement. Contains Zinc PCA as well but at likely lower concentration. Better for brightening and anti-aging; more expensive for similar sebum-balancing outcomes.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening. Check the open jar symbol on the packaging for the exact PAO printed by Q+A.
Store in a cool, dry place away from direct sunlight and heat. Avoid storing in steamy bathrooms. Optimal storage temperature: 15–25°C (59–77°F).
30ml glass bottle with a glass dropper pipette and rubber bulb. Outer cardboard carton included. Glass bottle and pipette are 100% recyclable; rubber bulb is currently not recyclable.
Yes — 30ml is under the 100ml airline liquid limit. The glass bottle is slightly fragile; wrap in clothing or use a protective case for travel. No pump, uses dropper pipette.
Frequently asked questions
FAQYes, this serum is considered safe for use during pregnancy and breastfeeding. The formula contains no retinoids (vitamin A derivatives), salicylic acid, hydroquinone, or high-dose chemical sunscreen actives that are typically restricted during pregnancy. The key ingredients — Zinc PCA, Betaine, Glycerin, plant extracts, and probiotic ferments — are all generally regarded as safe for expecting and nursing mothers. As always, consult your midwife, obstetrician, or dermatologist before introducing any new skincare product during pregnancy for personalised guidance.
No, this serum is not confirmed safe for fungal acne (also known as Malassezia folliculitis or pityrosporum folliculitis). The formula contains multiple ferment filtrates: Lactobacillus/Ganoderma Lucidum Extract/Lentinus Edodes Extract Ferment Filtrate, Lactobacillus Ferment, and Leuconostoc/Radish Root Ferment Filtrate. Fermentation-derived ingredients can potentially feed Malassezia yeast on the skin surface, which may worsen fungal acne. If you have confirmed fungal acne, we recommend choosing a serum specifically formulated without ferments, or consulting a dermatologist before use.
Yes, with some considerations. Zinc PCA pairs excellently with niacinamide (vitamin B3) for enhanced sebum regulation — this is one of the most recommended combinations for oily skin. It can be layered with vitamin C serums, though apply vitamin C first (as it is typically more pH-sensitive). With retinol, use them at separate times (e.g., Zinc PCA in the morning, retinol at night) to avoid overloading the skin. With AHA/BHA exfoliants, use caution: this serum already contains a low concentration of lactic acid (AHA), so adding additional exfoliants in the same step could increase irritation risk. Space them out across your routine or different days if your skin is sensitive.
This serum was primarily formulated for oily, combination, and acne-prone skin types — and it excels for all three. The sebum-regulating action of Zinc PCA directly addresses the root cause of shine, enlarged pores, and breakouts. Combination skin users particularly benefit, as Betaine and Glycerin hydrate drier areas while Zinc PCA controls the T-zone. Sensitive and rosacea-prone skin can also benefit thanks to the anti-inflammatory mushroom complex and the fragrance-free, alcohol-free formula — a patch test is still advised. Dry skin types can use it but should follow with a richer moisturiser and may find a dedicated hydrating serum more impactful for their primary needs.
You may notice your skin feeling more balanced and less oily within the first 1–2 weeks of daily use. Visible improvements in blemishes and redness typically appear within 2–4 weeks. For meaningful pore refinement and consistent reduction in breakouts, the clinical evidence for Zinc PCA references 28 days (4 weeks) of regular use as the point of statistically significant sebum reduction. For best long-term results — including the skin-firming benefits of the mushroom complex — consistent use over 2–3 months is recommended. Patience is key; this is a progressive treatment serum, not an instant-fix product.
Apply this serum as step 3 in your routine: after cleansing and toning, but before moisturiser and SPF. The general rule is to apply serums from thinnest to thickest consistency. This serum is lightweight and water-based, so it should be applied before heavier serums, facial oils, or creams. Always follow with a moisturiser to seal in the active ingredients — the humectants in this serum need an occlusive layer above them for best results. In the morning, finish with a broad-spectrum SPF 30+ sunscreen, as the low-concentration lactic acid in the formula can slightly increase UV sensitivity.
No — this serum has a very low comedogenic rating of 1 out of 5. In fact, Zinc PCA is actively anti-comedogenic: it regulates sebum, which is one of the primary contributors to clogged pores. The formula contains no high-comedogenic oils, heavy waxes, or occlusive butters. Propylene Glycol, Glycerin, and Betaine all have comedogenic ratings of 0–1. Multiple users with clogged pores (including closed comedones) report significant improvement after regular use. This is one of the most pore-friendly serum formulas available at this price point.
The recommended period after opening (PAO) is 12 months. Check the open jar symbol printed on your product packaging for the exact PAO. At 2–3 drops per application used twice daily, a 30ml bottle typically lasts approximately 4–6 weeks. To maximise shelf life, keep the bottle closed tightly between uses, store away from heat and direct sunlight, and avoid letting the dropper touch your skin to prevent contamination of the remaining product.
Verdict: The Q+A Zinc PCA Facial Serum delivers impressive, science-backed results for oily, combination, and acne-prone skin at an accessible price point. The synergistic blend of Zinc PCA, a fermented mushroom complex, probiotic ferments, and gentle hydrating humectants makes this one of the most thoughtfully formulated budget serums available in the UK market. It is fragrance-free, alcohol-free, vegan, cruelty-free, and pregnancy-safe — ticking most of the boxes that conscientious skincare shoppers look for. The main caveats are the small 30ml size, the presence of ferments making it unsuitable for confirmed fungal acne, and Propylene Glycol as the second ingredient which may irritate some sensitive skin types. For everyone else — especially those dealing with shine, congestion, and enlarged pores — this is a highly recommended daily serum that consistently earns repeat purchases.
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 |
|---|---|---|---|
| 3 |
Propylene Glycol
Solvent, Skin Conditioning, Fragrance, Humectant, Viscosity Controlling, Viscosity Decreasing Agent, Skin-Conditioningagent - Miscellaneous
|
Hydrating
|
|
| 0 |
Lactobacillus/Ganoderma Lucidum Extract/Lentinus Edodes Extract Ferment Filtrate
Skin Conditioning
|
|
|
| 1 |
Betaine
Skin Conditioning, Humectant, Viscosity Controlling, Antistatic Agent, Hair Conditioning
|
Hydrating
Irritation
Dark Spots
|
|
| 1 |
Pentylene Glycol
Solvent, Skin Conditioning
|
|
|
| 0 |
Zinc PCA
|
Promotes Wound Healing
Redness
|








