Is petroleum jelly safe, and is it better than 'natural' moisturizers?

Petroleum jelly (petrolatum) is a semi-solid blend of saturated hydrocarbons refined from petroleum⁹. The FDA lists petrolatum, white petrolatum and mineral oil among its skin-protectant ingredients¹¹.

What it does well. It is an occlusive, meaning it holds water in the outer skin layer. Under a Raman microscope petrolatum swelled that layer by 40 to 60 percent, against 10 to 20 percent for paraffin oil and two vegetable oils¹. It is not only a surface film: in volunteers it also seeped between the outer skin cells and sped barrier recovery after the barrier was disrupted with acetone². For wounds, it matched bacitracin on healing and overall infection in 922 patients after skin surgery, although it had more Staphylococcus aureus infections⁸.

How it compares with "natural" options. Across 77 eczema trials, moisturizers lowered severity and flares, and the Cochrane reviewers found no reliable evidence that one beats another³. Single trials point both ways. Virgin coconut oil beat mineral oil in 117 children with mild to moderate eczema (SCORAD down 68 versus 38 percent)⁵, while olive oil weakened the skin barrier in adult volunteers and sunflower oil did not⁴. We found no head-to-head human trials of shea butter, tallow or jojoba against petrolatum; see our pages on shea butter, tallow and eczema.

The hydrocarbon worry. Saturated mineral-oil hydrocarbons (MOSH) accumulate in body fat with age. In 142 women, levels were linked to use of sun cream, hand cream and lipstick but not to diet, which suggests cosmetics may contribute¹⁰. Yet a review of 13 studies found mineral oils and waxes stay in the outer skin layers, with no evidence of absorption into the body⁹. Europe's food regulator concluded in 2023 that current dietary MOSH exposure is not a health concern, while an aromatic fraction (MOAH) remains a possible concern; that judgment concerns food, not skin¹².

Using it sensibly. Choose plain white petrolatum from an established brand and apply it thinly. Keep it out of the nose, because lipid-containing nasal products have been linked to lipoid pneumonia⁶. Do not use daily emollients to try to prevent eczema in newborns, even those at high risk; a large trial found no benefit and more skin infections⁷.

Occlusion and barrier

Stamatas and colleagues used confocal Raman microspectroscopy in nine adults and seven infants. Paraffin oil and two vegetable oils entered only the top layers of the stratum corneum, similarly in adults and infants, and swelled it by 10 to 20 percent; petrolatum swelled it by 40 to 60 percent¹. Ghadially and colleagues applied Vaseline petroleum jelly to volunteers after acetone disruption of the barrier. Recovery was faster, not slower, than at untreated sites, and microscopy placed the jelly in the gaps between cells at every depth of the stratum corneum². Both studies were small and used surrogate measures of barrier function.

Wound care

Smack and colleagues randomized 922 patients having dermatologic surgery (1,249 wounds) to white petrolatum or bacitracin; 440 and 444 were evaluable. Infection occurred in 9 patients with petrolatum (2.0%) and 4 with bacitracin (0.9%) (95% CI for the difference -0.4% to 2.7%; P=.37). Eight of the petrolatum infections were Staphylococcus aureus, against none with bacitracin (P=.004). No petrolatum patient developed allergic contact dermatitis, against 4 (0.9%) with bacitracin (P=.12), and healing did not differ at days 1, 7 or 28⁸. Overall infection rates were not significantly different, but the S. aureus imbalance is a reason to keep wounds clean and watch for infection.

Eczema and moisturizers

The Cochrane review pooled 77 randomized trials (6,603 participants, mean age 18.6 years, mean duration 6.7 weeks); 36 were at high risk of bias. Moisturizers lowered investigator-assessed severity (12 studies, 1,281 participants, standardized mean difference -1.04; high-quality evidence) and flares (six studies, 607 participants, relative risk 0.33; moderate-quality evidence), with no difference in adverse events. The authors found no reliable evidence that one moisturizer is better than another³. Evangelista and colleagues randomized 117 children with mild to moderate atopic dermatitis to virgin coconut oil or mineral oil for eight weeks. SCORAD fell 68.2% with coconut oil and 38.1% with mineral oil (P<0.001), and transepidermal water loss fell from 26.7 to 7.1 versus 24.1 to 13.6. The comparator was mineral oil, not petrolatum, in a single-center trial⁵. In Danby's randomized forearm studies of 19 adults, four weeks of olive oil reduced stratum corneum integrity and caused mild redness, while sunflower seed oil preserved integrity and improved hydration⁴.

Babies

BEEP randomized 1,394 newborns at high risk of eczema to a daily emollient (Diprobase cream or DoubleBase gel) for a year or to standard advice. At age two, eczema was present in 23% (139 of 598) versus 25% (150 of 612) (adjusted relative risk 0.95, 95% CI 0.78 to 1.16). Skin infections were more frequent with emollients (0.23 versus 0.15 per child; incidence rate ratio 1.55, 1.15 to 2.09)⁷. This tested prevention in babies without eczema, not treatment of eczema that is already there.

Residues and absorption

Concin and colleagues measured saturated mineral-oil hydrocarbons in subcutaneous fat from 142 women having elective cesarean sections (median 52.5 mg/kg). Age was the strongest predictor (P<0.001). Sun cream use in pregnancy (P=0.002), hand cream (P=0.011) and lipstick (P=0.007) were independent predictors, diet was not, and fat and milk levels correlated¹⁰. This is a questionnaire-based association and may reflect other exposures. Petry and colleagues reviewed 13 in vivo and in vitro studies of dermal penetration: most of the material was adsorbed to the stratum corneum, only a minor fraction reached deeper layers, and they found no evidence of systemic absorption⁹. The two bodies of evidence do not line up neatly. Lip products are partly swallowed, which might explain some of the residue findings, but that is unproven. The EFSA update of 2023, which concerns food, judged dietary MOSH exposure no concern for any age group because liver effects in one rat strain were tied to wax accumulation that does not occur in humans. It raised a possible concern for aromatic hydrocarbons with three or more rings, which are genotoxic, and noted missing data on one- and two-ring MOAH¹².

Nose and lungs

A German review of drug databases and the literature found that lipoid pneumonia, a potentially lethal condition with no specific treatment, has been described with mineral-oil-containing nasal products, and that evidence suggests some risk with plant oils too. It advised using lipid-containing nasal products only with great caution⁶.

Gaps

No trial compares petrolatum with shea butter, tallow or jojoba that we could find. Most moisturizer trials last weeks, not years, and we found no published measurements of aromatic hydrocarbons in today's consumer petrolatum.

Bottom line (confidence 3 of 5). Plain white petrolatum is an effective, inexpensive occlusive that appears safe on skin and in wounds. The hydrocarbon-residue question is open rather than alarming. Natural oils may suit some people, but no trial shows they beat it overall.