Clean Skincare Formulations: Practical Examples and Ingredient Guide

chevonne stewart
4 days ago
14 min read

Formulator measuring clean skincare ingredients

Clean skincare formulations are products built around a short, transparent ingredient list that excludes commonly flagged sensitizers and prioritizes barrier-supportive, clinically tolerated actives. In practice, that means no parabens, no sodium lauryl sulfate (SLS), no synthetic fragrance, no phthalates, and no drying denatured alcohols, with every ingredient earning its place by function… Here are four quick examples to orient you before the full recipes below:

Gentle gel cleanser: Sodium cocoyl isethionate at a mild concentration, aloe vera gel providing soothing benefits, glycerin as a humectant, phenoxyethanol as a preservative, formulated to a gentle pH suitable for sensitive skin
Hydrating serum: Sodium hyaluronate for surface hydration, niacinamide for brightening and barrier support, panthenol as a conditioning agent, benzyl alcohol + ethylhexylglycerin blend as preservative, formulated within a gentle pH range
Everyday moisturizer: Cetearyl alcohol for emollient and texture, caprylic/capric triglyceride as lightweight emollient, glycerin for hydration, sodium benzoate + potassium sorbate as preservative system, formulated at skin-friendly pH levels
Facial oil (anhydrous): Blend of nourishing oils including rosehip seed oil, jojoba oil, and squalane, with vitamin E as antioxidant; no preservative required due to absence of water

Full INCI lists, phase breakdowns, and complete percentage ranges follow in the examples section.

What does “clean skincare” actually mean for formulators?
What ingredients does every clean formulation need?
Example clean skincare formulations with full ingredient breakdowns
How do you keep clean formulations safe and stable?
Where can you source clean ingredients in the United States?
What do formulators and clinicians wish you knew about clean formulations?
Key Takeaways
Why this guide exists, and what Fundamentalskin sees in practice
Fundamentalskin’s professional treatments for complex skin concerns
Useful sources and testing resources

What does “clean skincare” actually mean for formulators?

The term “clean beauty” has no single legal definition in the United States. Retailers like Ulta Beauty operationalize it through “Made Without” lists that badge products meeting their specific exclusion criteria. That means one brand’s “clean” may differ from another’s, and your job as a formulator or informed consumer is to look past the label and read the INCI list directly.

In formulation practice, clean skincare generally means three things: ingredient transparency (full INCI disclosure), the absence of a defined set of flagged ingredients, and a focus on non-sensitizing, barrier-supportive actives. The commonly excluded ingredients, and the reasons formulators drop them, include:

Parabens (methylparaben, propylparaben): flagged for potential endocrine disruption at high doses, though regulatory bodies including the FDA consider them safe at cosmetic use levels. Clean brands exclude them to meet consumer expectations.
Sodium lauryl sulfate (SLS): a strong anionic surfactant that disrupts the skin barrier and causes irritation at standard use levels, particularly in daily cleansers.
Synthetic fragrance (listed as “Fragrance” or “Parfum”): a catch-all term that can mask hundreds of undisclosed chemicals, including known allergens. The EWG Skin Deep database flags fragrance as a high-concern ingredient for sensitization.
Phthalates (DBP, DEHP): plasticizers sometimes used in fragrance compounds; excluded due to endocrine-disruption concerns.
Drying denatured alcohols (SD alcohol, alcohol denat.): disrupt the lipid barrier with repeated use; different from fatty alcohols like cetearyl alcohol, which are emollient and accepted in clean formulas.
Certain chemical UV filters (oxybenzone, octinoxate): debated for hormone-disruption potential and reef toxicity; some clean brands substitute zinc oxide or titanium dioxide.
PEG compounds with contamination risk: PEGs themselves are low-hazard, but manufacturing impurities (1,4-dioxane) drive exclusion in strict clean formulas.

What “clean” does not guarantee is efficacy or safety by default. Healthline notes that natural ingredients are not inherently safer, and lavender oil, for example, is a known sensitizer despite being botanical. Clinical tolerability and stability testing matter more than a “natural” badge.

Pro Tip: When reading an INCI list, prioritize the exclusion of fragrance and SLS before worrying about parabens. Both fragrance and SLS have stronger evidence for causing barrier disruption and sensitization in daily-use products. Parabens, while excluded by most clean brands, are considered safe at cosmetic use levels by the FDA.

What ingredients does every clean formulation need?

Every finished skincare product, regardless of how “clean” its positioning, requires the same functional building blocks: a carrier phase (water, oil, or both), an emollient, a humectant, a surfactant or emulsifier (if applicable), a preservative system (for any water-containing product), and optional actives. Multifunctional ingredients that serve two or more of these roles simultaneously are a hallmark of well-designed clean formulas because they keep the ingredient count low without sacrificing performance.

Variety of clean skincare ingredient bottles

Role	Clean-Friendly INCI Examples	Function	Notes
Humectant	Glycerin, sodium hyaluronate, panthenol, aloe barbadensis leaf juice	Draws water into the stratum corneum	Glycerin at 3–5% is the workhorse; sodium hyaluronate at 0.5–1% for surface hydration
Emollient	Caprylic/capric triglyceride, squalane, jojoba oil, shea butter	Softens and smooths skin surface	Shea butter (Butyrospermum parkii) scores low hazard on EWG
Occlusive	Beeswax, candelilla wax, rice bran wax	Seals moisture in; used in balms and heavier creams	Candelilla is vegan; beeswax is not
Emulsifier	Cetearyl alcohol + cetearyl glucoside, glyceryl stearate SE	Binds oil and water phases	Choose HLB-matched pairs for stable emulsions
Surfactant (cleanser)	Sodium cocoyl isethionate, cocamidopropyl betaine, decyl glucoside	Removes oil and debris without stripping	Glucosides and isethionates are mild and biodegradable
Preservative	Phenoxyethanol (≤1%), benzyl alcohol + ethylhexylglycerin, sodium benzoate + potassium sorbate	Prevents microbial growth	Sodium benzoate + potassium sorbate requires pH ≤5.5 to be effective
Active	Niacinamide (5%), ascorbyl glucoside (2–3%), bakuchiol (0.5–1%)	Targets specific skin concerns	Check pH compatibility before combining actives
Botanical extract	Aloe barbadensis leaf juice, green tea extract (EGCG), centella asiatica	Anti-inflammatory, antioxidant support	Aloe vera is well-tolerated and low-hazard

Preservation options that fit clean positioning

The preservative conversation is where many beginner formulators get stuck. “Natural” preservatives like rosemary extract and vitamin E are antioxidants, not antimicrobials. They protect oils from oxidation but do nothing to prevent bacterial or mold growth in a water-based product. The genuinely effective options that align with most clean-brand criteria are:

Phenoxyethanol (≤1%): widely accepted, broad-spectrum, and effective across pH 4–8. Some strict “natural” brands exclude it, but it is approved by Ecocert at ≤1%.
Benzyl alcohol + ethylhexylglycerin (e.g., Euxyl PE 9010): Ecocert-approved blend, effective at 0.5–1%, works best at pH ≤6.
Sodium benzoate + potassium sorbate: natural-origin, cost-effective, but only effective at pH ≤5.5. Ideal for toners and serums with low pH targets.
Leuconostoc/radish root ferment filtrate: marketed as a “natural” preservative booster; best used in combination with a primary preservative, not alone.

Pro Tip: Multifunctional ingredients reduce your total ingredient count and can simplify your preservative system. Glycerin at 5%+ has mild antimicrobial properties that support your primary preservative. Panthenol doubles as a humectant and skin-conditioning agent. Niacinamide at 5% is both an active and a mild antimicrobial booster.

Example clean skincare formulations with full ingredient breakdowns

These formulas are designed as starting-point templates. Adjust percentages within the stated ranges based on your specific raw materials, supplier guidance, and patch-test results. Every formula targets a pH window that supports the skin’s acid mantle, typically pH 4.5–6.5 depending on product type.

Gentle gel cleanser (pH 5.0–5.5)

Goal: mild daily face wash, light foam, sulfate-free, suitable for sensitive skin.

Colonial Chemical’s published clean face wash demonstrates this approach with bio-based surfactants and cold-process assembly.

Phase	INCI Name	% Range	Role
A (water)	Aqua (water)	to 100%	Carrier
A	Aloe barbadensis leaf juice	5–10%	Soothing humectant
A	Glycerin	3–5%	Humectant
B	Sodium cocoyl isethionate	10–15%	Primary mild surfactant
B	Cocamidopropyl betaine	3–5%	Secondary surfactant, foam booster
B	Decyl glucoside	2–4%	Co-surfactant, mild
C	Phenoxyethanol	0.5–1%	Preservative
C	Panthenol	1–2%	Conditioning, barrier support
Adjust	Citric acid	q.s.	pH adjustment to 5.0–5.5

Why it’s clean: No SLS, no synthetic fragrance, no parabens. Surfactants are biodegradable and low-irritant. Preservative is Ecocert-compatible at ≤1%.

Hydrating toner/mist (pH 5.5–6.5)

Goal: lightweight, alcohol-free hydrating mist for all skin types.

Phase	INCI Name	% Range	Role
A	Aqua (water)	to 100%	Carrier
A	Aloe barbadensis leaf juice	10–20%	Soothing base
A	Glycerin	3–5%	Humectant
A	Sodium hyaluronate	0.5–1%	Surface hydration
B	Panthenol	1–2%	Conditioning
B	Niacinamide	2–3%	Brightening, barrier support
C	Sodium benzoate	0.5%	Preservative (requires pH ≤5.5 to be most effective; adjust if needed)
C	Potassium sorbate	0.5%	Preservative partner
Adjust	Lactic acid	q.s.	pH adjustment

Hyaluronic acid hydrating serum (pH 5.5–6.5)

Goal: plumping, lightweight serum for daily hydration.

Phase	INCI Name	% Range	Role
A	Aqua (water)	to 100%	Carrier
A	Sodium hyaluronate (high MW)	0.5–1%	Surface film, hydration
A	Sodium hyaluronate (low MW)	—	Deeper penetration
A	Glycerin	5%	Humectant
B	Panthenol	2%	Conditioning
B	Allantoin	0.5%	Soothing
C	Benzyl alcohol + ethylhexylglycerin	0.5–1%	Preservative
Adjust	Citric acid	q.s.	pH to 5.5–6.5

Stable vitamin C derivative serum (pH 5.5–7.0)

Goal: antioxidant brightening serum using a stable ascorbic acid derivative.

Pure L-ascorbic acid is notoriously unstable and requires pH 3.0–3.5, which is too acidic for sensitive skin. Ascorbyl glucoside (a stable derivative) works at a gentler pH and is far easier to formulate cleanly.

Phase	INCI Name	% Range	Role
A	Aqua (water)	to 100%	Carrier
A	Glycerin	3–5%	Humectant
A	Ascorbyl glucoside	2–3%	Stable vitamin C active
B	Niacinamide	5%	Brightening, pore-minimizing
B	Panthenol	2%	Conditioning
C	Phenoxyethanol	0.5–1%	Preservative
Adjust	Sodium hydroxide / citric acid	q.s.	pH to 5.5–7.0

Why this pairing works: Niacinamide and ascorbyl glucoside are compatible at this pH range. Avoid combining pure L-ascorbic acid with niacinamide at low pH, as it can cause yellowing.

Lightweight niacinamide serum (pH 5.5–6.5)

Goal: daily brightening and barrier-repair serum, water-light texture.

This is the most beginner-friendly formula in this set. It uses a simple water phase with no emulsification required, making it easy to produce in small batches.

Phase	INCI Name	% Range	Role
A	Aqua (water)	to 100%	Carrier
A	Niacinamide	5–10%	Key active
A	Glycerin	5%	Humectant
A	Sodium hyaluronate	0.5%	Hydration
B	Allantoin	0.5%	Soothing
B	Panthenol	2%	Barrier support
C	Benzyl alcohol + ethylhexylglycerin	0.5–1%	Preservative
Adjust	Citric acid	q.s.	pH to 5.5–6.5

Everyday moisturizer, light emulsion (pH 5.0–5.5)

Goal: daily hydrating cream, non-greasy, suitable for normal to combination skin.

Phase	INCI Name	% Range	Role
A (water)	Aqua (water)	to 100%	Carrier
A	Glycerin	5%	Humectant
A	Aloe barbadensis leaf juice	5%	Soothing
B (oil)	Caprylic/capric triglyceride	5–8%	Lightweight emollient
B	Squalane	3–5%	Emollient, non-comedogenic
B	Cetearyl alcohol	3–4%	Co-emulsifier, texture
B	Cetearyl glucoside	1–2%	Primary emulsifier
C	Phenoxyethanol	0.5–1%	Preservative
C	Panthenol	2%	Conditioning
C	Niacinamide	5%	Active (add to cooled emulsion)
Adjust	Citric acid	q.s.	pH to 5.0–5.5

Facial oil/balm (anhydrous, no preservative required)

Goal: nourishing facial oil for dry or mature skin, zero water content.

Anhydrous formulas do not support microbial growth, so no preservative is needed. An antioxidant (vitamin E) protects the oils from oxidation.

Ingredient	INCI Name	% Range	Role
Rosehip seed oil	Rosa canina fruit oil	—	Linoleic acid, skin repair
Jojoba oil	Simmondsia chinensis seed oil	—	Wax ester, balancing
Squalane	Squalane	15–20%	Lightweight, non-comedogenic
Sea buckthorn (diluted)	Hippophae rhamnoides fruit oil	1–3%	Carotenoids, antioxidant
Vitamin E	Tocopherol	0.5–1%	Antioxidant, oxidation protection
Optional: bakuchiol	Bakuchiol	0.5–1%	Retinol alternative, anti-aging

Pro Tip: Use a modular frame approach: build one stable base formula (your “chassis”), then swap or add actives to create a product range. Your niacinamide serum base, for example, can become a brightening serum (add ascorbyl glucoside), a soothing serum (add allantoin + centella asiatica extract), or an anti-aging serum (add bakuchiol) without changing the carrier, preservative, or pH system. This frame formulation method cuts development time and reduces failed batches significantly.

How do you keep clean formulations safe and stable?

Preservation is not optional. Any product containing water, aloe vera juice, hydrosols, or water-soluble extracts can support bacterial and mold growth within days if unpreserved. This is the single most important safety principle in clean formulation, and it applies regardless of how “natural” your ingredient list is.

Preservation and pH checklist

Confirm your preservative’s effective pH range before finalizing the formula.
Sodium benzoate + potassium sorbate: effective at pH ≤5.5 only.
Phenoxyethanol: effective across pH 4–8, most stable below pH 6.
Benzyl alcohol + ethylhexylglycerin blends: most effective at pH ≤6.
Measure pH with a calibrated pH meter, not strips, for accuracy.
Target pH 5.0–6.0 for cleansers to preserve the skin’s acid mantle and microbiome.
Target pH 5.5–6.5 for serums and toners; pH 5.0–5.5 for emulsions.
Adjust pH after adding all ingredients, including actives, since niacinamide and some extracts can shift pH.

Stability testing to run before launch

Freeze/thaw cycling: three cycles of freezing at 4°F (–20°C) and thawing at room temperature. Checks emulsion stability and phase separation.
Accelerated aging: store at 104°F (40°C) and 75% relative humidity for 4–8 weeks. Predicts 12–24 months of real-time shelf life.
Centrifuge test: spin at 3,000 RPM for 30 minutes. A quick screen for emulsion instability before investing in longer tests.
Real-time shelf testing: store at room temperature alongside accelerated samples. Required for final label claims.
Preservative efficacy testing (PET / challenge testing): inoculate the product with standard microbial strains (USP 51 or ISO 11930) and measure kill rates over 28 days. This is mandatory for any product you sell.

U.S. regulatory basics for clean skincare claims

The FDA regulates cosmetics under the Federal Food, Drug, and Cosmetic Act. A product is a cosmetic if it is intended to cleanse, beautify, or alter appearance. The moment a product claims to treat, cure, or prevent a condition (e.g., “heals eczema,” “treats acne”), it crosses into drug territory and requires a different approval pathway. For “clean” marketing claims, use language like “formulated without,” “free from [specific ingredient],” or “made with [ingredient]” rather than therapeutic claims. Avoid “non-toxic” without evidence, since the FDA has flagged it as potentially misleading when unsubstantiated.

Where can you source clean ingredients in the United States?

Practical sourcing starts with knowing which supplier category matches your batch size and budget. A hobbyist making 100g batches has different needs than a small brand scaling to 10kg runs.

Supplier categories and examples

Cosmetic raw material distributors: Lotioncrafter, Making Cosmetics, and Brambleberry stock a wide range of INCI-named ingredients with Certificates of Analysis (CoAs) and suggested use levels. Good for small to mid-size batches.
Trade-only ingredient houses: Univar Solutions, Brenntag, and Ashland supply formulators at commercial scale with full technical data sheets and regulatory support. Minimum order quantities apply.
Specialty preservative suppliers: Clariant, Lonza, and Ashland offer Ecocert-approved preservative systems (including benzyl alcohol + ethylhexylglycerin blends) with full pH and use-level guidance.
Botanical extract suppliers: Jedwards International and Bulk Apothecary supply carrier oils, waxes, and botanical extracts with CoAs. Always request heavy metal and pesticide testing data for botanical inputs.
Contract labs for PET and stability testing: Eurofins, SGS, and Intertek all offer USP 51 preservative efficacy testing, accelerated stability, and microbial limit testing in the U.S.

What to ask your supplier

Request a Certificate of Analysis (CoA) for every raw material, every batch.
Ask for the supplier’s recommended use level and effective pH range for preservatives.
Request safety data sheets (SDS) and any available skin sensitization or irritation data.
For botanical extracts, ask specifically about country of origin, extraction method, and any third-party purity testing.
Confirm whether the ingredient meets any third-party standard you are targeting (Ecocert, COSMOS, NSF/ANSI 305).

For a step-by-step approach to switching to an organic skincare routine using clean-sourced ingredients, Fundamentalskin’s guide walks through the transition practically and without the guesswork.

What do formulators and clinicians wish you knew about clean formulations?

The most important thing a clinician wants you to understand is this: tolerability is the first measure of a clean formula’s success, not the length of its “free from” list. A product that irritates your skin barrier is not clean, regardless of what the label says.

Here are six practical tips from formulation and clinical practice:

Always patch test. Apply a small amount of any new formula to the inner forearm for 48 hours before full-face use. This applies to both consumers and formulators testing new batches.
Track pH at every stage. pH shifts during manufacturing, especially when you add actives, acids, or botanical extracts. Measure after every addition, not just at the end.
Avoid fragrance in formulations for sensitive skin. Fragrance, even natural essential oils, is the leading cause of cosmetic contact dermatitis. If you need scent, consider a low-level hydrosol (rose water, chamomile hydrosol) rather than essential oil.
Combine actives with care. Niacinamide and hyaluronic acid work well together. Retinol and AHAs at low pH do not. Citruslabs’ formulation overview covers common pairings and incompatibilities worth reviewing before you finalize a formula.
Set realistic expectations for “natural” preservatives. Rosemary extract and vitamin E protect oils from oxidation. They do not prevent microbial contamination in water-based products. Pair them with a proven antimicrobial preservative.
Use a modular base to speed development. Build one stable, well-tested chassis and vary only the actives. This approach, described in frame formulation practice, reduces the number of stability tests you need to run and makes troubleshooting much faster.

Understanding how professionals build skincare routines that prioritize barrier health gives you a useful clinical lens for evaluating your own formulas.

Pro Tip: If you are developing a product range, build your frame formula first and get it fully stability-tested and PET-certified. Every product in the range that uses the same base inherits that safety data, which cuts your testing costs and timeline considerably.

About the author: Chevonne is a Dermal Clinician with 15 years of clinical experience, specializing in pigmentation, aging skin, redness, and barrier health. She leads the team at Fundamentalskin, where clinical expertise meets organic, carefully sourced ingredients to deliver real, visible results.

Key Takeaways

Clean skincare formulations succeed when every ingredient earns its place by function, the preservative system matches the product’s pH, and stability is confirmed before the product reaches skin.

Point	Details
Define “clean” by exclusions	Avoid SLS, synthetic fragrance, phthalates, and drying alcohols; check INCI lists, not marketing claims.
Preserve every water-based product	Sodium benzoate + potassium sorbate (pH ≤5.5), phenoxyethanol (≤1%), or benzyl alcohol + ethylhexylglycerin are the reliable clean-compatible options.
Match pH to product type	Target pH 5.0–6.0 for cleansers, pH 5.5–6.5 for serums and toners, and pH 5.0–5.5 for emulsions to support barrier health.
Use modular frame formulas	Build one stable base, then swap actives to create a range without re-engineering your preservative or emulsifier system.
Fundamentalskin for clinical support	When DIY formulation reaches its limits, Fundamentalskin offers professional consultations and clinically backed treatments for complex skin concerns.

Why this guide exists, and what Fundamentalskin sees in practice

Publishing a formulation guide is not something every clinic does. Fundamentalskin created this resource because the clean beauty space generates a lot of confusion, and that confusion has real consequences for skin health. Clients arrive having tried multiple “clean” products that irritated their barrier, not because clean skincare doesn’t work, but because they were using formulas that lacked proper preservation, had incompatible pH, or contained botanical allergens marketed as gentle.

The goal here is to give you the knowledge to evaluate what you’re putting on your skin, whether you’re a beginner formulator, an ingredient-curious consumer, or someone building a small product line. Clean and clinical are not opposites. The most effective approach combines both: transparent, well-formulated ingredients and the clinical expertise to know when a product is working and when it isn’t.

For readers who want to go further, Fundamentalskin’s organic skincare routine checklist is a practical companion to the formulas above. And when skin concerns go beyond what a well-formulated product can address, professional treatments offer a level of precision and safety that DIY simply cannot replicate.

Fundamentalskin’s professional treatments for complex skin concerns

When your skin needs more than a well-formulated serum can deliver, professional intervention makes a real difference. Fundamentalskin offers clinically supervised treatments specifically designed for women dealing with pigmentation, aging skin, redness, fine lines, and dull texture, all with zero downtime.

The Larimedical Biomimetic Peel uses biomimetic technology to resurface and rebalance skin at a clinical level, with results backed by before-and-after imaging. For clients who want to address deeper concerns alongside their clean skincare routine, the Biomimetic Peel + LED Therapy combines professional-grade resurfacing with red light therapy for accelerated skin recovery and collagen support. Every treatment is tailored to your skin’s specific needs by Chevonne, a Dermal Clinician with 15 years of experience.

Ready to see what your skin is capable of? Book a consultation at Fundamentalskin and get a personalized plan built around your skin, not a generic formula.

Useful sources and testing resources

Use these references to verify ingredient safety data, check regulatory guidance, and find testing services relevant to U.S.-based formulators.

EWG Skin Deep Database — searchable ingredient safety database with hazard scores and source citations; use it to check individual INCI names before finalizing a formula.
FDA Cosmetics Guidance — primary U.S. regulatory source for cosmetic vs. drug classification, labeling requirements, and prohibited ingredients.
Colonial Chemical Clean & Simple Face Wash Formula — published example formula with INCI names, percent-by-weight guidance, and pH targets for a mild sulfate-free cleanser.
Colonial Chemical Ultra Gentle Daily Facial Cleanser — cold-process cleanser recipe with surfactant blend and preservative options.
FormulaBotanica Avocado Cleansing Milk — formulation resource with pH guidance for barrier-supportive cleansers.
Citruslabs Skincare Formulation 101 — overview of actives, compatibility notes, and formulation principles for safe product development.

Supplier and testing resource notes:

For a deeper look at how natural actives perform in clinical and formulation contexts, the types of natural skin actives guide from Fundamentalskin covers the evidence behind key botanicals and their safe use levels. And if you want to understand why chemical-free skincare matters from a consumer health perspective, that partner resource addresses the common myths and the real ingredient concerns worth paying attention to.