The average person applies between 9 and 15 personal care products to their skin daily, exposing themselves to over 100 unique chemical compounds before leaving the house. The skin, once considered an impermeable barrier, is now understood to be a significant route of systemic absorption — particularly for lipophilic (fat-soluble) compounds. Yet the regulatory framework governing cosmetic and skincare ingredients in many countries, including New Zealand and Australia, remains largely permissive, placing the burden of safety assessment on the consumer.
This article provides a clinical review of the most concerning carcinogenic and endocrine-disrupting chemicals commonly found in conventional skincare and makeup formulations, and presents the evidence base for pure botanical oils as a biocompatible, therapeutically active alternative.
Carcinogenic and Harmful Ingredients in Conventional Skincare
1. Parabens (Methylparaben, Propylparaben, Butylparaben)
Parabens are synthetic preservatives used extensively in moisturisers, cleansers, and cosmetics. They are well-established xenoestrogens — compounds that mimic oestrogen in the body by binding to oestrogen receptors. Studies have detected intact parabens in human breast tumour tissue, raising concerns about their role in hormone-sensitive cancers. The European Commission has restricted several long-chain parabens in cosmetics, though shorter-chain variants remain widely used.
2. Formaldehyde-Releasing Preservatives
Ingredients such as DMDM hydantoin, imidazolidinyl urea, diazolidinyl urea, and quaternium-15 slowly release formaldehyde — a Group 1 human carcinogen classified by the International Agency for Research on Cancer (IARC) — into the product over time. These preservatives are found in shampoos, conditioners, body washes, and moisturisers. Chronic low-level dermal exposure to formaldehyde has been associated with sensitisation, contact dermatitis, and carcinogenic risk.
3. 1,4-Dioxane (Ethoxylated Surfactant Contaminant)
1,4-Dioxane is not an intentionally added ingredient but a manufacturing by-product of the ethoxylation process used to produce common surfactants including sodium laureth sulfate (SLES), PEG compounds, and ingredients ending in "-eth" or "-oxynol". The US Environmental Protection Agency (EPA) classifies 1,4-dioxane as a probable human carcinogen. It is not listed on product labels, making consumer identification impossible without independent testing.
4. Phthalates (DBP, DEHP, DEP)
Phthalates are plasticisers used to improve product texture and fragrance longevity. They are potent endocrine disruptors, interfering with testosterone and oestrogen signalling, and have been associated with reproductive toxicity, developmental abnormalities, and increased cancer risk in animal models. In skincare, phthalates are frequently concealed under the generic term "fragrance" or "parfum" on ingredient labels.
5. Synthetic Fragrances
The term "fragrance" on a label can represent a proprietary blend of up to several hundred individual chemicals, many of which are not disclosed. This category includes known allergens, neurotoxins, and endocrine disruptors such as musk ketone, benzophenone, and various phthalates. The lack of transparency in fragrance formulation represents one of the most significant regulatory gaps in cosmetic safety.
6. Oxybenzone and Chemical Sunscreen Filters
Oxybenzone (benzophenone-3), avobenzone, and octinoxate are UV-filtering chemicals used in chemical sunscreens. Oxybenzone is a documented endocrine disruptor, detected in human blood, urine, and breast milk following topical application. Studies have demonstrated its ability to alter hormone levels and has been associated with endometriosis in women. The FDA has called for further safety data on these compounds, and several jurisdictions have moved to restrict their use.
7. Hydroquinone
A skin-lightening agent used in brightening creams and serums, hydroquinone has been classified as a possible human carcinogen by the IARC based on animal studies demonstrating renal tubular cell carcinomas. It is banned in cosmetics in the European Union and several other jurisdictions, yet remains available in over-the-counter products in some markets.
8. Coal Tar Dyes (p-phenylenediamine and derivatives)
Derived from petrochemicals, coal tar dyes are used in hair dyes, shampoos, and scalp treatments. They are classified as probable or possible human carcinogens and have been associated with bladder cancer in occupationally exposed individuals. On labels, they appear as "CI" followed by a five-digit number, or as FD&C or D&C colour designations.
The Makeup Industry: A Hidden Source of Toxic Exposure
While skincare products receive increasing scrutiny, the makeup industry represents an equally significant — and often overlooked — source of daily toxic chemical exposure. Cosmetic products applied to the face, lips, and eyes are subject to particularly high absorption risk due to the thin, vascular nature of facial skin and the proximity to mucous membranes. Lipstick and lip gloss, for example, are frequently ingested in small quantities throughout the day, bypassing dermal absorption entirely and entering the gastrointestinal tract directly.
Heavy Metals in Makeup
Perhaps the most alarming finding in makeup safety research is the widespread presence of heavy metals — including lead, cadmium, arsenic, chromium, and nickel — in commonly used cosmetic products. A landmark study published in Environmental Health Perspectives found detectable levels of lead in over 96% of lipstick products tested from major commercial brands. Lead is a potent neurotoxin with no established safe level of exposure; it is classified as a Group 2A probable human carcinogen by the IARC and is associated with reproductive toxicity, cognitive impairment, and renal damage.
Heavy metals enter cosmetic formulations through contaminated raw materials — particularly colour pigments — and are not intentionally added ingredients. This means they are not required to be listed on product labels, making consumer avoidance extremely difficult without independent third-party testing.
- Lead — found in lipsticks, foundations, and eye shadows; neurotoxic, reproductive toxin, probable carcinogen
- Cadmium — found in eye shadows and blushes; classified as a Group 1 human carcinogen by the IARC, associated with renal toxicity and lung cancer
- Arsenic — found in foundations and concealers; Group 1 human carcinogen, associated with skin, bladder, and lung cancers
- Chromium (hexavalent) — found in eye shadows and nail products; Group 1 human carcinogen, associated with lung cancer and dermal sensitisation
- Nickel — found in eye shadows and blushes; a potent contact allergen and possible carcinogen
PFAS (Per- and Polyfluoroalkyl Substances) in Cosmetics
PFAS — commonly known as "forever chemicals" due to their extreme environmental and biological persistence — have been detected in a wide range of cosmetic products including foundations, concealers, mascaras, and lip products. A 2021 study published in Environmental Science & Technology Letters found high levels of fluorine (a PFAS marker) in 52% of foundations and eye products tested. PFAS are associated with thyroid disruption, immune suppression, reproductive toxicity, and increased risk of kidney and testicular cancers. They bioaccumulate in human tissue and are not metabolised or excreted efficiently.
Titanium Dioxide Nanoparticles
Titanium dioxide (TiO₂) is widely used as a white pigment and UV filter in foundations, concealers, sunscreens, and setting powders. In its nanoparticle form — used to improve texture and coverage — TiO₂ has been reclassified by the IARC as a Group 2B possible human carcinogen when inhaled, based on evidence of pulmonary inflammation and tumour formation in animal studies. Loose powder cosmetics and spray foundations present the highest inhalation risk. The European Union has restricted the use of TiO₂ nanoparticles in spray cosmetics as a precautionary measure.
Talc and Asbestos Contamination
Talc is a naturally occurring mineral used extensively in face powders, blushes, eye shadows, and body powders to absorb moisture and improve texture. Talc deposits are frequently co-located with asbestos — a Group 1 human carcinogen — in the earth, and inadequate purification processes have resulted in asbestos contamination of cosmetic talc products. Multiple major cosmetic brands have faced litigation and product recalls following the detection of asbestos in their talc-based products. Asbestos exposure is causally linked to mesothelioma, lung cancer, and ovarian cancer.
Retinyl Palmitate in Daytime Products
Retinyl palmitate (vitamin A palmitate) is a common ingredient in foundations, tinted moisturisers, and lip products marketed for anti-ageing benefits. However, research conducted by the US National Toxicology Program found that retinyl palmitate may accelerate the development of skin tumours when applied to skin exposed to UV radiation — a significant concern for products intended for daytime use. While retinoids applied at night and washed off present a different risk profile, their inclusion in leave-on daytime cosmetics warrants caution.
Lip Products: A Direct Route of Ingestion
Lipstick, lip gloss, and lip liner occupy a unique risk category among cosmetics because they are routinely ingested. Studies estimating daily lipstick ingestion suggest that regular users may consume between 24mg and 87mg of product per day. Given the heavy metal contamination documented in lip products — particularly lead, cadmium, and chromium — this represents a direct oral exposure route that bypasses the skin barrier entirely. Children and adolescents who use lip products are at particular risk given their lower body weight and greater sensitivity to neurotoxic and carcinogenic compounds.
The Skin Barrier and Systemic Absorption
The stratum corneum provides a degree of protection against aqueous compounds, but lipophilic molecules — including most of the chemicals listed above — penetrate the skin barrier with relative ease. Factors that increase dermal absorption include:
- Compromised skin barrier function (eczema, psoriasis, inflammation)
- Prolonged skin contact (leave-on products vs. rinse-off)
- Application to thin-skinned areas (eyelids, neck, inner arms)
- Heat and occlusion (post-shower application, under clothing)
- Nanoparticle formulations designed to enhance penetration
Once absorbed, these compounds enter systemic circulation and may accumulate in adipose tissue, the liver, and endocrine organs over time.
The Case for Pure Botanical Oils
In contrast to synthetic formulations, pure cold-pressed botanical oils offer a biocompatible, nutrient-dense alternative that works in harmony with the skin's natural lipid matrix. The skin's sebum is itself a complex lipid — and many plant oils share a remarkably similar fatty acid profile, allowing them to integrate seamlessly into the skin barrier rather than disrupting it.
Key Therapeutic Mechanisms of Botanical Oils
- Barrier restoration — essential fatty acids (linoleic acid, alpha-linolenic acid) replenish the skin's lipid bilayer, reducing transepidermal water loss (TEWL) and improving barrier integrity
- Anti-inflammatory activity — gamma-linolenic acid (GLA) and omega-3 fatty acids modulate prostaglandin synthesis, reducing cutaneous inflammation
- Antioxidant protection — tocopherols (vitamin E), carotenoids, and polyphenols in botanical oils neutralise free radicals and protect against UV-induced oxidative damage
- Collagen support — certain oils stimulate fibroblast activity and collagen synthesis, supporting skin structure and elasticity
- Antimicrobial properties — medium-chain fatty acids (lauric acid, caprylic acid) exhibit antimicrobial activity against pathogenic bacteria and fungi
Clinically Relevant Botanical Oils
Evening Primrose Oil
Rich in gamma-linolenic acid (GLA, approximately 8–10%), evening primrose oil is one of the most clinically studied oils for inflammatory skin conditions including eczema, psoriasis, and rosacea. GLA is a precursor to anti-inflammatory prostaglandins and is often deficient in individuals with atopic conditions. Both topical and oral supplementation have demonstrated benefit in clinical trials.
Recommended: E.P.O. Evening Primrose Oil — a high-potency evening primrose oil supplement delivering therapeutic levels of GLA to support skin health from within.
Borage Oil
Borage oil contains the highest concentration of GLA of any commercially available plant oil (approximately 20–26%), making it particularly potent for inflammatory skin conditions and hormonal skin changes. It also supports adrenal function and stress resilience, which are closely linked to skin health via the HPA axis.
Recommended: Nordic Beauty Borage Oil — a premium borage oil delivering high-potency GLA to support skin barrier function, reduce inflammation, and promote a healthy complexion.
Black Currant Seed Oil
Uniquely, black currant seed oil contains both GLA (omega-6) and stearidonic acid (SDA, an omega-3 precursor), providing a balanced anti-inflammatory fatty acid profile. It supports skin hydration, elasticity, and immune-mediated skin conditions, and has demonstrated benefit in clinical studies for atopic dermatitis and age-related skin changes.
Recommended: Black Currant Seed Oil — a dual omega-3 and omega-6 botanical oil supporting skin hydration, barrier integrity, and anti-inflammatory pathways.
Cod Liver Oil
Beyond its well-known omega-3 content (EPA and DHA), cod liver oil provides preformed vitamin A (retinol) and vitamin D3 — both critical for skin cell turnover, barrier function, and immune regulation. Vitamin A deficiency is associated with follicular hyperkeratosis and impaired wound healing, while vitamin D plays a key role in keratinocyte differentiation and antimicrobial peptide production.
Recommended: Arctic-D Cod Liver Oil Liquid (Lemon) — a premium Nordic cod liver oil providing omega-3 fatty acids, vitamin A, and vitamin D3 to support skin health, immune function, and systemic anti-inflammatory activity.
Inside-Out Skin Health: The Role of Collagen
Topical oils address the skin barrier from the outside, but optimal skin health requires structural support from within. Collagen — the most abundant protein in the dermis — provides tensile strength, elasticity, and hydration. Collagen synthesis declines at approximately 1% per year from the mid-twenties, accelerated by UV exposure, smoking, high-sugar diets, and — critically — oxidative stress from toxic chemical exposure.
Hydrolysed collagen peptides have demonstrated in clinical trials the ability to stimulate fibroblast collagen synthesis, improve skin elasticity, reduce wrinkle depth, and increase dermal hydration.
Recommended: Designs for Health Whole Beauty Collagen — a practitioner-grade hydrolysed collagen peptide formula designed to support dermal collagen synthesis, skin elasticity, and whole-body connective tissue health.
Practical Guidance: Transitioning to Clean Skincare and Makeup
Transitioning away from conventional skincare and makeup products requires a systematic approach. The following framework is recommended:
- Audit your current products — use resources such as the Environmental Working Group's Skin Deep database to assess the safety profile of your existing products
- Prioritise leave-on and lip products first — moisturisers, foundations, and lip products have the highest absorption and ingestion potential and should be replaced before rinse-off products
- Avoid loose powder and spray cosmetics — these present the highest inhalation risk for titanium dioxide nanoparticles and other airborne particulates
- Choose certified clean makeup brands — look for products independently tested for heavy metals and PFAS, and certified free from talc, synthetic fragrance, and formaldehyde-releasing preservatives
- Simplify your routine — a single high-quality botanical oil often replaces multiple conventional products (moisturiser, serum, facial oil, and primer)
- Introduce oils gradually — begin with one oil and allow 4–6 weeks to assess skin response before adding additional products
- Support detoxification internally — as the body clears accumulated toxicants from years of conventional product use, nutritional support for hepatic and antioxidant pathways is advisable
Conclusion
The conventional skincare and makeup industry's reliance on synthetic preservatives, petrochemical derivatives, heavy metals, PFAS, and endocrine-disrupting compounds represents a significant and underappreciated source of chronic toxic exposure. For individuals seeking to reduce their total toxic burden and support long-term skin and systemic health, transitioning to pure botanical oils — supported by targeted internal supplementation — represents a clinically sound and evidence-informed strategy.
As with all health interventions, individual responses vary, and navigating the world of clean beauty and targeted supplementation can feel overwhelming.
That is why Ritu and her team at The Wellness Store are here to help. Whether you are unsure where to start, looking for personalised product recommendations, or seeking guidance on a comprehensive skin health protocol, our practitioners are available to support you every step of the way. We invite you to reach out, book a consultation, or visit us in store — because your skin health journey deserves expert, compassionate care.
This article is intended for informational and educational purposes only and does not constitute medical advice. Please consult a qualified healthcare practitioner before making changes to your health, skincare, or makeup regimen.