Facial Serum for Sensitive Skin: Plastic-Free, Fact-Checked

Do You Need a Serum at All?

Not always. A gentle cleanser, a moisturiser and sunscreen cover the basics for most skin. A serum makes sense when you want to target one thing, like redness, dryness or dull skin.

The trouble starts when serums pile up. Every extra product means more to buy, more packaging to throw away and, for sensitive skin, more chances of irritation. Our advice: choose one serum for one clear reason, use it up, and only then decide whether you need another.

The Bottle Problem

Most serums come in a dropper: a glass bottle, a plastic collar and a rubber bulb. These parts are made of different materials, and the rubber bulb in particular doesn’t fit standard recycling streams. Packaging makers are working on droppers made from one material, but they are not the norm yet. If you use a dropper serum, take it apart before recycling the glass.

Home-compostable bottles avoid this, but only if you have a home compost. Most bio-waste bins in the Netherlands and Belgium don’t accept compostable packaging, so check your municipality’s rules before you count on it.

What Serum Claims Actually Prove

“Strengthening” and “barrier repair”. EU law says every cosmetic claim must be backed by evidence, but brands don’t have to publish it. Where studies exist, they are often small. One published trial of a niacinamide serum on 25 people found better hydration and less redness after five weeks, but no measurable change in how much water the skin lost. Look for published results, what was measured and how many people took part.

“Dermatologically tested”. Usually this means the serum was tested for irritation, not that it works.

“Natural”, “biodegradable”, “eco-friendly”. Since 27 September 2026, EU rules ban these broad claims unless the brand can back them with recognised proof, such as the EU Ecolabel. Labels a brand made up itself are banned too. Treat any that remain with caution.

Certifications worth looking for. AllergyCertified for sensitive skin, Vegan Society or V-Label for vegan claims, Leaping Bunny for cruelty-free, and COSMOS or NATRUE for natural cosmetics. They are useful guidance, not guarantees.

Short on time? Jump to Our Verdict for who this serum is best for.

What Is It

●●●●●●●●○○ 8/10

A 30 ml facial serum made for sensitive skin, built around biotech actives: fermented niacinamide, superoxide dismutase (an antioxidant enzyme from yeast), hyaluronic acid, a firming peptide and a ferment extract from the bacterium Sphingomonas. Bioli sells it as a serum to strengthen the skin.

The full ingredient list is published: Aqua, C9-12 Alkane, Niacinamide, Pentylene Glycol, Betaine, Cellulose Gum, Phenoxyethanol, Microcrystalline Cellulose, Xanthan Gum, Sphingomonas Ferment Extract, Citric Acid, Sodium Hyaluronate, Caprylyl Glycol, Superoxide Dismutase, Polyglyceryl-3 Polyricinoleate, Tromethamine, Acetyl Heptapeptide-4. There is no fragrance, no parabens, no silicones, no microplastics and no synthetic dyes. No palm oil is listed, and the brand states the formula is 100% vegan.

The bottle and dropper are made from fermented microorganisms and, according to the brand, break down in about 52 weeks in home compost. The outer packaging is a single FSC-certified paper bag that doubles as the shipping bag, so there is no extra box, no glass and no plastic.

Who Makes It

●●●●●●●●○○ 8/10
🇩🇰 Denmark

Bioli ApS is an independent Danish biotech skincare startup, founded in 2021 by Nina Wiberg Rosenquist and launched in 2025. It has no private equity backer and no corporate parent. According to the brand, it developed its products with scientists from a leading Danish university and the Novo Nordisk Foundation’s Centre for Biosustainability, with funding from Innovation Fund Denmark.

Our take: we rate Bioli 8/10 for how much it has built from first principles. The packaging is made from microorganisms, the actives are grown by fermentation, and every ingredient is disclosed. It also answers hard questions openly. Bioli shared additional documents with us that we can’t publish. We checked them ourselves, and they answered several of our open questions. That openness is what sets it apart, because many brands barely reply to hard questions.

Bioli doesn’t name its manufacturing partner, which isn’t unusual for a young brand. The certificate we reviewed covers specific types of medicines and doesn’t list creams, so it shows a regulator-inspected quality system but doesn’t directly cover this product. The partner is a small company without a formal ESG framework or sustainability report yet, something we’d like to see as Bioli grows.

Bioli says it doesn’t test on animals, as EU law requires, and we found nothing to suggest otherwise. It doesn’t hold Leaping Bunny. The brand has chosen not to pursue it, arguing that EU brands shouldn’t market what the law already requires. We understand that position for a young brand, though a certificate would add an independent check of the supply chain.

Bioli launched in 2025, and most of what’s missing is what a young brand hasn’t built yet: a published life cycle analysis, a B Corp application, an impact report, independent reviews and directory listings. We see these as points for improvement, not red flags.

How to Use

1. Apply a few drops to clean skin and follow with your moisturiser.
2. When the bottle is empty, put it and the dropper in your home compost.

What We Like

✅ Plastic-free from bottle to bag: a bottle and dropper made from fermented microorganisms and a single FSC-certified paper bag, with no glass and no extra box.
✅ The bottle is made to break down in home compost, which is rare in skincare.
✅ Short, fully disclosed ingredient list of 17 ingredients, with no fragrance, parabens, silicones or microplastics.
✅ Safety checked beyond the legal minimum: the AllergyCertified label means toxicologists review every ingredient for allergens and hormone disruptors.
✅ Fermentation-based actives (niacinamide, enzyme, hyaluronic acid) instead of plant extracts. Bioli says its lower water, energy and CO₂ claims rest on a preliminary life cycle analysis. The results aren’t published and we haven’t seen them, so we treat this as a credible claim, not a verified one.
✅ Tested under dermatological supervision on 25 volunteers with sensitive or allergy-prone skin, with no irritation reported, according to the brand.
✅ Independent Danish startup with no corporate parent, so no conflict with a bigger group’s less ethical portfolio.

What We Don’t Like

⚠️ C9-12 Alkane is the second ingredient, so there is a lot of it in the formula. It is made from either plant or petroleum feedstock, and the product page doesn’t say which. Bioli’s site says “No petrochemical-based ingredients” and also claims 100% biodegradable ingredients, so this is worth confirming. We’d like the brand to state the origin.
⚠️ Phenoxyethanol is in the formula. It is a permitted preservative, safe below the 1% EU limit, and it breaks down quickly in nature, but it is made from petrochemicals and some consumer apps flag it. Bioli says the preservative is needed for microbiological safety, which is fair, but it means the “No petrochemical-based ingredients” claim isn’t accurate and should be reworded. The “100% biodegradable” claim is a separate issue: since 27 September 2026, new EU rules ban broad claims like “biodegradable” unless they are backed by recognised proof.
⚠️ No published results for the serum. The 25-person test checked for irritation, not for whether the serum works, so the “strengthening” claims are unproven.
⚠️ No independent reviews yet. The serum launched in 2025, and the testimonials on the brand’s own site are brand-curated.
⚠️ The bottle needs a home compost. Most bio-waste bins don’t accept compostable packaging, as the brand says itself. If you can’t home compost, it goes in general waste.

Why Trust It

🧪 AllergyCertified · 🏅 Tænk A-kolbe rating · ♻️ OK compost HOME · 🌲 FSC paper bag

AllergyCertified is confirmed with the certifier. The Tænk rating, OK compost HOME and FSC are the brand’s claims, which we haven’t checked in the certifiers’ own databases.

Our Experience

We tried this serum ourselves for 4 weeks. Both of us have sensitive skin, and we used it daily without any irritation. It doesn’t smell like perfume, which is what you want from a fragrance-free serum. It feels soothing when you put it on, and the texture feels premium. That is two people over 4 weeks, not a clinical trial, and everyone’s skin is different. Even with the caveats above, it’s a serum we’d recommend.

Disclosure: Bioli sent us a sample of this serum to try.

There are no independent reviews yet, because the brand launched in 2025. Besides our own experience, there is a 25-person dermatological test and a 15-person self-reported consumer study, both reported by the brand.

The Verdict

A fragrance-free biotech serum with truly plastic-free packaging, held back by one ingredient question the brand should answer.

This is one of the more credible entries in biotech skincare. The packaging earns its claims: a bottle and dropper made from microorganisms, a single FSC paper bag, no plastic and no glass. The ingredient list is short, fully disclosed and free of fragrance, parabens, silicones and microplastics. The safety checks go beyond the legal minimum, and the fermentation-based actives are a real sustainability idea, not a label.

Like most skincare, it has a few open questions. We want Bioli to confirm where C9-12 Alkane comes from, since it is the second ingredient and the brand’s site says “No petrochemical-based ingredients”. Phenoxyethanol sits in the formula too, so the “no petrochemical” claim should be reworded, and the “100% biodegradable” claim needs recognised proof under the new EU rules. The life cycle analysis is unpublished, the serum has no published efficacy results, and independent reviews don’t exist yet. None of this surprises us for a brand that launched in 2025, and we’d happily revisit our rating as Bioli publishes more.

Discount for GGG readers: use the code GGG20 at checkout to get 20% off.

Delivery:

🇩🇰 Denmark: 2 to 5 business days, DKK 30 to 55
🇩🇪 Germany: 3 to 8 business days, €7 (pick-up point) or €15 (home)
🇧🇪 🇳🇱 🇫🇷 🇱🇺 🇵🇱 🇸🇪 Belgium, Netherlands, France, Luxembourg, Poland, Sweden: 3 to 8 business days, €10
🇫🇮 🇬🇷 🇨🇿 🇮🇹 🇪🇸 🇵🇹 Finland, Greece, Czech Republic, Italy, Spain, Portugal: 3 to 8 business days, €10 (UPS)
🇬🇧 United Kingdom: 3 to 8 business days, £10 (UPS)
🇪🇺 Rest of Europe: €15
🇳🇴 Norway: DKK 150
🇺🇸 United States: 5 to 10 business days, $30
🇰🇷 South Korea: DKK 200
🇦🇺 Australia: AUD 45
🌍 Rest of the world: 7 to 20 business days, DKK 200

Free shipping across Europe via pick-up point on orders over €90. Outside the EU you pay import duties and taxes yourself, and parcels to the US and China may be delayed by customs.

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