Vaseline, which is pure white petrolatum, is one of the most effective skin protectants available. It reduces moisture loss from the skin by up to 98%, far outperforming other oil-based moisturizers, which typically reduce it by only 20% to 30%. It’s inexpensive, widely available, and backed by decades of clinical use for everything from dry skin to post-surgical wound care.
How Petrolatum Protects Your Skin
Vaseline doesn’t actually add moisture to your skin. Instead, it creates a nearly impermeable film on the surface that traps the water already there. This is why dermatologists call it an “occlusive” moisturizer: it seals hydration in rather than delivering it. The practical takeaway is that Vaseline works best when applied to slightly damp skin, such as right after washing your face or stepping out of the shower, so there’s actually moisture to lock in.
Unlike many plant-based alternatives, petrolatum stays on the skin’s surface rather than absorbing into it. The hydrocarbon molecules that make up petrolatum are too large to pass through the outer layer of skin (the stratum corneum) and enter your bloodstream. A comprehensive review of dermal penetration studies found no evidence that cosmetic-grade mineral oils and waxes become systemically available. They sit on the surface, do their job, and wash off.
Skin Barrier Repair and Eczema
Petrolatum does more than just sit passively on your skin. Research published in The Journal of Allergy and Clinical Immunology found that applying petrolatum increased the production of filaggrin and loricrin, two proteins essential for building a strong skin barrier. It also thickened the outermost layer of skin and reduced inflammatory immune cells in people with atopic dermatitis (eczema), even in skin that appeared normal.
This is significant because eczema-prone skin carries hidden barrier and immune defects even between flares. By reinforcing the barrier and calming that low-level inflammation, petrolatum acts as more than a simple moisturizer. It’s a genuinely therapeutic option for people with chronically dry or eczema-prone skin, and it’s one of the least likely ingredients to cause an allergic reaction. Petrolatum is chemically inert and non-allergenic, which matters when your skin is already irritated.
Wound Healing Without Antibiotics
If you’ve ever reached for antibiotic ointment after a minor cut or scrape, plain petrolatum may work just as well. A study in the Journal of the American Academy of Dermatology compared petrolatum-based skin protectant to a combination antibiotic ointment for post-procedure wound healing. The results showed no differences in redness, swelling, crusting, or how quickly the skin sealed back together at any time point.
The antibiotic group actually fared slightly worse in one respect: participants reported significantly more burning at the one-week mark, and one case of allergic contact dermatitis was reported. Antibiotic ointments contain active ingredients that a subset of people react to, while petrolatum carries essentially zero allergy risk. For everyday minor wounds, keeping the area moist with plain Vaseline and a bandage is a simple, effective approach.
Vaseline vs. Natural Oils and Butters
Shea butter, coconut oil, beeswax, and other plant-based alternatives are popular, and they do provide some barrier protection. But they’re meaningfully less occlusive than petrolatum. Where Vaseline blocks nearly all water loss, natural emollients create a more breathable but less effective seal. For someone with mildly dry skin who prefers a lighter feel, that tradeoff may be fine. For someone dealing with cracked, severely dry, or eczema-prone skin, petrolatum’s superior occlusion is the better choice.
There’s also a stability difference. Petrolatum is extremely shelf-stable and requires no preservatives. Plant oils can oxidize over time, which changes their scent and color, and occasionally triggers allergic reactions. If you have sensitive skin, this predictability is a real advantage.
Is It Safe to Use on Your Face?
Highly purified petrolatum is considered non-comedogenic, meaning it’s not expected to clog pores in most people. That said, the American Academy of Dermatology does not recommend applying petrolatum-based products to your face if you have acne-prone skin. The reasoning is straightforward: acne-prone and oily skin already has an adequate (or excessive) lipid layer, and adding a heavy occlusive on top can trap sebum and bacteria beneath it, potentially worsening breakouts.
The “slugging” trend, where people apply a thin layer of Vaseline as the final step of their nighttime skincare routine, has gained popularity for good reason. For dry, dehydrated skin, it effectively locks in the products applied underneath and supports overnight barrier repair. But dermatologists at the Cleveland Clinic advise skipping slugging entirely if you have oily skin, active acne, or any kind of skin infection.
Purity Matters
One legitimate concern about petrolatum is contamination with polycyclic aromatic hydrocarbons (PAHs), which are carcinogenic compounds found in unrefined petroleum products. This is where the distinction between industrial-grade and cosmetic-grade petrolatum matters enormously. The United States Pharmacopeia (USP) sets strict refining standards for white petrolatum and specifically tests for PAH contamination. Any product labeled “USP white petrolatum,” including Vaseline brand, has been refined to meet these safety thresholds.
The concern about PAHs applies to poorly refined petrolatum found in some unregulated products, not to major brands sold in pharmacies. If you’re buying a recognized brand in the U.S. or Europe, the petrolatum has gone through extensive purification.
How to Get the Most Out of It
Because Vaseline seals in whatever is already on your skin, applying it to a clean, slightly damp face or body gives you the best results. After cleansing, pat your skin so it’s still a little moist, apply any serums or lighter moisturizers you use, then layer a thin coat of Vaseline on top. You don’t need much. A pea-sized amount covers most of the face, and a thin, even layer on the body is plenty.
For cracked heels or dry hands, applying Vaseline and then covering with cotton socks or gloves overnight creates an intense moisture treatment that most people notice by morning. On lips, it works as well as or better than most dedicated lip balms, since it contains no fragrances, flavors, or potential irritants. For minor cuts and scrapes, a thin layer keeps the wound moist and protected while it heals.
Vaseline is not a complete skincare routine on its own. It won’t deliver active ingredients like retinol or vitamin C, and it won’t exfoliate or treat hyperpigmentation. Think of it as the final protective layer: simple, effective, and remarkably versatile for what it costs.