A skin cream can appear to work remarkably well for a simple reason the label never mentions: it may contain a real drug.
That is the concern raised by a new laboratory study of over-the-counter skin products sold online. Researchers found undisclosed clobetasol propionate—a superpotent prescription corticosteroid—in six products marketed for skin lightening, eczema, psoriasis, or dermatitis. Two of those products also contained an undeclared antifungal drug.
The finding deserves attention. It does not justify panic, and it does not show that one-third of all online skin products are contaminated. The researchers deliberately chose a small group of products that looked more likely to contain hidden active ingredients. What the study does show is that some widely reviewed products can contain prescription-strength drugs at clinically meaningful concentrations while presenting themselves as ordinary cosmetic, herbal, or over-the-counter treatments.
In this article
- What the researchers tested
- What they found
- Why hidden clobetasol matters
- What the study cannot tell us
- Product red flags worth noticing
- What to do if you use one of these products
What the researchers tested
The study, published online October 8, 2026, in JAMA Network Open, evaluated 18 skin products purchased from major online retail platforms. Products were selected if they made claims for persistent or inflammatory skin conditions without listing a clinically proven active ingredient, had at least 100 consumer reviews, or resembled products previously reported to contain undisclosed drugs.
This was a targeted laboratory investigation, not a random survey of the online marketplace. The researchers screened products for 28 corticosteroids and antifungals using high-resolution liquid chromatography–mass spectrometry, then used tandem mass spectrometry to confirm suspected findings. When a hidden active ingredient was detected, they bought and tested two additional units of the same product.
That confirmation step strengthens confidence that the detected substances were real rather than laboratory noise or an anomaly in one container.
What they found
Six of the 18 preselected products contained undeclared clobetasol propionate in all three tested units. The products identified in the paper were Neoprosone gel, Neoprosone cream, Neoprosone serum, Qian Nian Qi Cao cream, Psor-Val spray, and Zudaifu cream. The researchers also detected undeclared terbinafine in Qian Nian Qi Cao and undeclared miconazole in Zudaifu.
The measured clobetasol concentrations ranged from about 0.01% to 0.46%. Standard prescription clobetasol products commonly use a 0.05% concentration. Several samples were in that general range or above it, and the highest measured concentration was roughly nine times 0.05%.
The labels did not disclose these active drugs. Some products instead emphasized ingredients such as arbutin, vitamin C, herbal ingredients, castor oil, lactic acid, zinc pyrithione, or hydrocortisone. Collectively, the positive products had more than 10,000 consumer reviews when the researchers recorded marketplace data.
The practical problem is not that clobetasol is an inherently bad medicine. Used for the right condition, in the right place, for an appropriate duration, it can be effective. The problem is exposure without informed consent, dosing instructions, contraindications, monitoring, or even knowledge that a prescription-strength corticosteroid is present.
Why hidden clobetasol matters
Clobetasol is among the most potent topical corticosteroids. Its effectiveness is also why it requires care. FDA-approved labeling warns that absorption through the skin can suppress the hypothalamic-pituitary-adrenal axis, the hormonal system involved in the body’s stress response and cortisol production. Risk rises with stronger products, larger treatment areas, prolonged use, occlusion, damaged skin, liver disease, and young age.
Local harms can include thinning skin, stretch marks, visible small blood vessels, acne-like eruptions, irritation, and changes in pigmentation. Facial and skin-fold areas generally absorb topical steroids more readily and are more vulnerable to injury. Use around the eyes can create additional concern. Abruptly stopping prolonged exposure can also allow the underlying condition to rebound or uncover systemic steroid suppression.
Undeclared antifungals create a different problem. A person cannot consider allergies, interactions, resistance, or whether the treatment matches the actual diagnosis when the active ingredient is hidden. A rash that improves temporarily under a potent steroid may also return, worsen, or become harder to diagnose after inflammation has been suppressed.
This is one reason a product’s apparent effectiveness cannot establish its honesty or safety. Strong results may reflect a pharmacologically active ingredient rather than the herbal blend, cosmetic ingredient, or wellness story used to market it.
What the study cannot tell us
The study is strong at answering a narrow question: were selected drugs present in the tested samples? Its analytical method and repeat testing make the positive findings credible. The authors reported no conflicts of interest.
It is weak at answering a broader question: how common is this across all skin products sold online? The sample included only 18 products, and the researchers intentionally enriched it for products with suspicious claims, labeling, or similarities to products previously associated with hidden drugs. The 33% positive rate is therefore a detection yield within a high-risk sample, not a market-wide prevalence estimate.
The study also did not measure how many people used the products, how much they applied, how long they used them, or how many experienced harm. It screened for a defined set of corticosteroids and antifungals, so it could miss other undisclosed drugs or unfamiliar chemical forms. Products, sellers, and formulations may change over time, which means a brand name alone cannot establish what is inside every unit now on the market.
The evidence is therefore important and actionable, but it should be described precisely: confirmed hidden drugs were found in repeated samples of six specifically selected products. The study does not prove that most online skin care is unsafe.
Product red flags worth noticing
No consumer checklist can detect a hidden drug. Laboratory testing can. Still, several features should raise the threshold for trust:
- Disease-treatment claims without a credible active ingredient. A product promises to control psoriasis, eczema, dermatitis, fungal infection, or another persistent condition while listing only vague botanical or cosmetic ingredients.
- Very rapid or unusually dramatic results. Potent drugs can make a product seem exceptional. Speed is not proof of contamination, but it is not proof of a superior “natural” formula either.
- Incomplete labeling. Missing manufacturer information, unreadable ingredients, inconsistent packaging, or no clear directions make responsible use difficult.
- Marketplace popularity treated as quality control. Thousands of reviews show reach, not chemical identity, manufacturing consistency, or regulatory compliance.
- “Herbal,” “natural,” or imported used as a safety guarantee. Those words do not reveal whether the contents match the label.
- A product that suppresses symptoms but requires continuous use. Recurrence can happen for many legitimate reasons, but repeated dependence on an unlabeled cream deserves clinical review.
The FDA advises consumers to be cautious with products marketed through online marketplaces and maintains notifications about products found to contain hidden ingredients. Its database is useful but incomplete; the absence of a warning does not certify a product as clean.
What to do if you use one of these products
If you use a product named in the study, stop treating the label as a complete account of what may be inside. Do not assume, however, that a current container is identical to the units tested in 2025 and 2026. Save the packaging, ingredient list, seller information, lot number, and purchase record.
Contact a dermatologist, pharmacist, or other qualified healthcare professional—especially if you have used the product regularly, applied it to the face or around the eyes, used it over a large area, used it on a child, or developed skin thinning, stretch marks, acne-like changes, unusual pigmentation, eye symptoms, or a severe rebound after stopping.
After prolonged or extensive exposure, do not improvise a taper based on an online article. A clinician can help determine whether gradual withdrawal, examination, laboratory assessment, or treatment of the original skin condition is appropriate.
Suspected adverse events or quality problems can be reported through FDA MedWatch. If a marketplace listing remains active, reporting it to the platform may also help, although a seller’s removal is not a substitute for regulatory investigation.
The broader lesson
Most people cannot send a cream to a mass-spectrometry laboratory. That creates an uncomfortable information gap: the buyer must often rely on the label, seller, manufacturer, marketplace, and regulatory system to tell the truth.
The reasonable response is neither blind trust nor fear of every unfamiliar ingredient. It is to match scrutiny to consequence. A basic moisturizer making modest cosmetic claims carries a different decision burden from an online product promising to treat chronic inflammatory disease or rapidly alter skin pigmentation.
For persistent eczema, psoriasis, dermatitis, fungal symptoms, or unexplained pigment changes, an accurate diagnosis is usually more valuable than another anonymous jar. A properly prescribed drug has known ingredients, defined strength, instructions, contraindications, and a clinician who can judge whether it belongs in the plan. An undeclared drug offers the pharmacology without the safeguards.
Related reading
- Room by Room: A Practical Guide to Reducing Unnecessary Chemical Exposures at Home
- Supplements, Wellness Culture, and the Business of Keeping People Searching
- Hidden Dangers in Health Foods and Supplements
Sources and further reading
- Abilov Z, James MJ, Porter ML, Popov YV. Undeclared Pharmacologically Active Ingredients in Over-the-Counter Skin Products. JAMA Network Open. Published October 8, 2026.
- U.S. Food and Drug Administration. Avoiding Products Contaminated with Hidden Ingredients.
- U.S. National Library of Medicine. Clobetasol Propionate Cream prescribing information. DailyMed.
- U.S. Food and Drug Administration. Sleep, Skin, Bodybuilding and Other Product Notifications.
Disclaimer
Content on Real David Julian is provided for educational and informational purposes and may include research-based discussion, personal experience, and opinion. It is not medical advice and is not a substitute for individualized care from a qualified healthcare professional. Always discuss your specific health needs, diagnoses, medications, supplements, treatments, or major health decisions with an appropriate healthcare professional. See the full Disclaimer for additional information.