Vaseline is made of 100% white petrolatum, a semisolid mixture of hydrocarbons derived from petroleum. Its ingredient list is remarkably short: petrolatum and a trace amount of water. There are no fragrances, preservatives, or stabilizers in the original formula. What makes it unique is the specific combination of hydrocarbons and the purification process that turns crude oil residue into something safe for skin.
What Petrolatum Actually Is
Petrolatum is a blend of saturated hydrocarbons, which are molecules made entirely of hydrogen and carbon atoms. These chains are mainly 25 carbon atoms or longer, and they come in both branched and ring-shaped forms. The substance works as a combination of liquid components (mineral oil) and solid components (paraffin wax and microcrystalline wax) locked together in a way that can’t be replicated by simply mixing those parts in a lab. That’s what gives Vaseline its distinctive texture: solid enough to sit on a shelf, soft enough to spread easily, and capable of melting slightly on warm skin.
The semisolid structure is key to how it works on skin. Petrolatum forms an occlusive barrier that reduces water loss through the skin by about 98%. Other oil-based moisturizers typically manage only 20% to 30%. This is why dermatologists recommend it so often for dry or damaged skin: it doesn’t add moisture so much as it locks in what’s already there.
From Oil Rig Residue to Pharmacy Shelf
The story starts in 1859, when a chemist named Robert Chesebrough noticed a waxy residue building up on oil drilling rigs. Workers called it “rod wax” and were already using it on cuts and burns. Chesebrough extracted the key ingredient, petrolatum, and spent years refining a purification process before eventually branding it as Vaseline.
The raw material comes from the thick residue left over during petroleum refining. In its crude form, this residue contains impurities that make it unsuitable for skin contact. Turning it into pharmaceutical-grade white petrolatum requires multiple purification steps.
How It’s Purified
The purification process involves three core stages: distillation, de-aeration (removing trapped air), and filtration. Vacuum distillation separates the desired hydrocarbons from heavier or lighter fractions. The residue is then filtered through materials like bone char, bleaching earth, or silica gel to strip out color and impurities.
There are several other methods available depending on the manufacturer. Some treat the raw material with sulfuric acid and then neutralize it with sodium hydroxide. Others use catalytic hydrogenation, a process that forces hydrogen gas through the material to break down unwanted compounds. Selective solvent extraction is another option, where specific solvents pull out impurities while leaving the desired hydrocarbons intact.
The biggest safety concern with petroleum-derived products is contamination by polycyclic aromatic hydrocarbons, a class of compounds linked to cancer. The United States Pharmacopeia, which sets purity standards for pharmaceutical ingredients, now requires a specific UV absorbance test designed to detect these contaminants. White petrolatum that meets USP standards has been refined to the point where these compounds are effectively removed. When you see “White Petrolatum, USP” on a label, that designation confirms the product has passed these safety benchmarks.
What’s in the Jar
The FDA’s drug database lists Vaseline Healing Jelly as containing 99.96 grams of petrolatum per 100 grams, with water as the only inactive ingredient. That’s it. No added vitamins, no emulsifiers, no fragrance. This simplicity is actually one of its advantages: with so few ingredients, there’s very little that can trigger an allergic reaction or irritation.
Flavored or specialty versions of Vaseline (like cocoa butter or aloe variants) do contain additional ingredients, but the original product is as close to a single-ingredient formula as you’ll find in any skincare product.
Why the Source Matters
Not all petrolatum is created equal. The difference between pharmaceutical-grade white petrolatum and the industrial stuff used in machinery comes down entirely to how thoroughly it’s been refined. Industrial petrolatum may still carry trace levels of the harmful compounds that purification is meant to remove. The European Union has stricter regulations around petrolatum purity than the United States, requiring proof of full refining history before a product can be used in cosmetics.
If you’re choosing a petroleum jelly product, look for “white petrolatum USP” on the label. That tells you the product meets pharmaceutical purity standards and has been tested for harmful contaminants. Products without that designation, particularly cheap or unbranded versions, may not have undergone the same level of refining.