Vaseline is one of the most effective over-the-counter options for dry skin. Its active ingredient, petrolatum, reduces water loss from the skin by up to 98%, far outperforming other oil-based moisturizers, which typically reduce water loss by only 20% to 30%. It’s inexpensive, widely available, and has a long safety record for use on dry, cracked, or dehydrated skin.
How Vaseline Actually Works
Vaseline doesn’t add moisture to your skin. Instead, it creates a physical barrier on the surface that traps the water already there and prevents it from evaporating. In skincare terms, this makes it an “occlusive,” one of three broad categories of moisturizing ingredients. Humectants (like hyaluronic acid or glycerin) pull water into the skin. Emollients (like ceramides or squalane) fill gaps between skin cells to smooth texture. Occlusives sit on top and seal everything in.
This distinction matters for how you use it. Because Vaseline locks in existing moisture rather than providing its own, applying it to bone-dry skin won’t do much. The best results come from applying a thin layer while your skin is still slightly damp, such as right after a shower or after washing your face. That way, you’re trapping a layer of water against the skin before it can evaporate.
Why It Works So Well for Dry Skin
Dry skin happens when the outermost layer of skin loses water faster than it can be replaced. This can be caused by cold weather, low humidity, hot showers, harsh soaps, or skin conditions like eczema. The skin’s natural lipid barrier breaks down, and water escapes more easily.
Petrolatum is uniquely effective here because of how thoroughly it blocks that water loss. At 98% reduction, no other readily available occlusive comes close. That’s why dermatologists frequently recommend plain petroleum jelly for conditions involving a damaged skin barrier, including eczema flare-ups, windburned skin, and the peeling that follows certain skin treatments. It also helps skin repair itself overnight by preventing further dehydration while your body does its natural restoration work during sleep.
The “Slugging” Technique
Slugging is the practice of applying a thin coat of petroleum jelly over your entire face (or just the driest areas) as the last step in your nighttime skincare routine. The name comes from the shiny, slug-like appearance it gives your skin. Cleveland Clinic dermatologists note that slugging can help retain moisture, repair a damaged skin barrier, and protect skin from environmental irritants by keeping outside molecules from penetrating the surface.
There are a few important caveats. You should avoid trapping active ingredients like alpha hydroxy acids, beta hydroxy acids, or retinoids underneath petroleum jelly. These can irritate the skin when sealed beneath an occlusive layer. If you use any of these products, either skip them on slugging nights or apply the petroleum jelly only to areas where you haven’t used actives.
Does Vaseline Clog Pores?
This is one of the most persistent concerns about petroleum jelly, and the evidence suggests it’s largely unfounded. A comprehensive review published in the Journal of the American Academy of Dermatology found that claims about petrolatum being comedogenic (pore-clogging) lacked supporting references. One early study did show mild comedogenicity when petrolatum was applied continuously under occlusion for six weeks, but the same researchers later reported that petrolatum actually improved acne papules. The review concluded that petrolatum is noncomedogenic and rarely causes allergic reactions.
That said, if you have oily or acne-prone skin, a thick occlusive layer may not be ideal. Your skin already produces a robust lipid layer, and adding more on top can worsen breakouts. This isn’t because Vaseline clogs pores directly, but because the extra occlusion can trap oil and bacteria that are already present. For people with normal to dry skin, pore clogging is not a realistic concern with regular use.
Who Should Skip It
Vaseline is safe for most people, but a few groups should be cautious:
- Oily or acne-prone skin: The additional barrier can trap excess oil and potentially worsen breakouts.
- Infected or wounded skin: Don’t apply petroleum jelly to deep wounds, puncture wounds, animal bites, or serious burns. It can seal bacteria into the wound.
- Skin with active irritation from acids or retinoids: Trapping these ingredients under an occlusive layer intensifies their effects and can cause redness or irritation.
If your skin becomes red or irritated after using Vaseline, that’s a signal to stop and reassess. True allergic reactions to petrolatum are rare, but they do exist.
How to Get the Most Out of It
For dry skin on your body, the simplest routine is to shower with lukewarm water (hot water strips skin oils), pat yourself mostly dry with a towel, and immediately apply a thin layer of Vaseline to the driest areas: hands, elbows, knees, heels, and shins. Your skin should still feel slightly damp when you apply it.
For your face, you can use it the same way after your evening cleansing routine. A pea-sized amount is enough for the whole face. You don’t need a thick layer. If the greasy feeling bothers you, apply it only to the patches that feel tightest or flakiest, like around the nose, on the cheeks, or along the jawline.
You can also layer it over a humectant serum or a lighter moisturizer for even better results. The humectant draws water into the skin, and the Vaseline locks it there. This combination addresses both sides of the hydration equation and tends to work better than either product alone for severely dry skin.
Choosing the Right Product
Look for products labeled “white petrolatum” or “USP petrolatum,” which meet United States Pharmacopeia purity standards. These designations mean the product has been refined to strict specifications, including limits on ultraviolet absorbance that ensure contaminants have been removed. Standard Vaseline brand petroleum jelly meets these requirements. Store-brand versions labeled USP are equally effective. Avoid unrefined or industrial-grade petrolatum, which is not intended for skin use.