Skin guide
Body serum vs. body lotion: what’s really in the bottle
Updated October 9, 2026 · 7-minute read
The short answer: a typical body lotion is mostly oils, waxes and emulsifiers that coat the skin to slow water loss; many of the best-selling ones are built on petrolatum and mineral oil. A water-based serum works the other way round: it delivers water-binding ingredients into the outer layer of skin and absorbs without a greasy film. Lotion seals; serum hydrates. If you want skin that feels hydrated rather than coated, a serum is the more direct route.
What’s in a typical body lotion
Turn over a bottle of drugstore body lotion and the first few ingredients are usually water, then some mix of petrolatum, mineral oil (often listed as paraffinum liquidum), dimethicone (a silicone), fatty alcohols and waxes, plus emulsifiers to hold oil and water together, preservatives, and often fragrance. One of the best-selling US lotions, Vaseline Intensive Care Advanced Repair, lists petrolatum fourth and mineral oil ninth, alongside dimethicone and two parabens (source).
Those oily ingredients are occlusives: they form a film on the surface that slows water from evaporating. That’s useful, but a film is not the same as hydration. It holds in whatever water is already there and adds none of its own.
Where petrolatum and mineral oil come from
Petrolatum (petroleum jelly) and mineral oil are refined from crude oil. Petroleum jelly was first noticed in 1859 as a waxy residue, called “rod wax,” that built up on oil-drilling rigs; it was later refined by distilling off the thinner oils and filtering what was left (source). Mineral oil and paraffin wax come from the same refining process.
To be fair: cosmetic-grade petrolatum is highly refined, and dermatologists recommend plain petroleum jelly for things like cracked heels and chapped lips (source). The European Union sets limits on certain impurities in it, which is why the refining grade matters (source). Our point isn’t that it’s dangerous. It’s that it’s a seal, not a skincare ingredient: it doesn’t bring water or anything else your skin uses. And the AAD itself cautions that petroleum jelly on the face can cause breakouts in people who are acne-prone (source).
How a water-based serum is different
A serum like Draíocht starts with water and adds ingredients that draw and hold water in the skin, rather than an oily film on top. That changes how it feels: it absorbs in a minute or two, doesn’t transfer to clothes or sheets, and leaves skin feeling soft instead of slick.
- Sodium hyaluronate (hyaluronic acid) 1%: draws water into the outer layer of skin.
- Niacinamide 4%: vitamin B3; helps support a healthy-looking skin barrier and calms the look of redness.
- Panthenol 3%: provitamin B5; softens and soothes the look of dry, rough patches.
- Propanediol 3%: a plant-derived humectant that adds water and helps the formula spread and absorb.
- Trehalose 2%: a sugar that helps skin hold on to water in dry conditions.
- Allantoin 0.4%: softens rough skin and soothes the look of irritation.
No petrolatum, no mineral oil, no silicones, no fragrance.
Side by side
| Draíocht serum | Typical drugstore body lotion | |
|---|---|---|
| Base | Water | Water plus oils, waxes and emulsifiers; often petrolatum and mineral oil |
| Main job | Adds water-binding ingredients to the skin | Coats the surface to slow water loss |
| Feel | Absorbs in a minute or two, no film | Can feel heavy or greasy; can transfer to fabric |
| Skincare actives | Six, every percentage on the label | Varies; percentages rarely shown |
| Fragrance | None | Common |
| Silicones | None | Dimethicone is common |
“Typical” means common drugstore formulas; some lotions are petrolatum-free or fragrance-free. Read the label of the one you use.
The fragrance problem
Fragrance is one of the most common reasons skin products irritate. In an analysis of the 100 best-selling body moisturizers in the US, 88% contained at least one known skin allergen, and 45% of products labeled “fragrance-free” still contained a fragrance ingredient or a botanical that can act like one (source). Dermatologists recommend fragrance-free products for dry skin (source). Draíocht has no fragrance and no essential oils.
Questions
What is the difference between a body serum and a body lotion?
A body lotion is mostly oils, waxes and emulsifiers that coat the skin to slow water loss. A water-based body serum delivers water-binding ingredients such as hyaluronic acid into the outer layer of skin and absorbs without a greasy film. Lotion seals; serum hydrates.
Can a body serum replace lotion?
For everyday dry skin, often yes. A water-based serum with several moisture-binding ingredients can be enough on its own. For very dry or cracked spots, add a thin seal of shea butter or jojoba oil on top.
Where does petrolatum come from?
Petrolatum (petroleum jelly) is refined from crude oil. It was first noticed in 1859 as a waxy residue on oil-drilling rigs and later refined into the jelly used today. Mineral oil and paraffin wax come from the same refining process.
Is petrolatum bad for your skin?
Cosmetic-grade petrolatum is highly refined and dermatologists use it for cracked heels and chapped lips. It is an occlusive: it seals the surface but adds no water or skincare ingredients, and the American Academy of Dermatology notes it can cause breakouts on the face in acne-prone people.
Does Draíocht contain petrolatum, mineral oil or silicones?
No. Draíocht is water-based and made without petrolatum, mineral oil, silicones, parabens or fragrance.
Why do so many lotions contain fragrance?
Fragrance is added for scent, but it is one of the most common causes of skin irritation. An analysis of the 100 best-selling US body moisturizers found that 45% of products labeled fragrance-free still contained a fragrance or botanical cross-reactor.
Sources
- DermFND, “Vaseline Intensive Care Advanced Repair Lotion” (full ingredient list). dermfnd.org/p/vaseline-intensive-care-advanced-repair-lotion/
- Wikipedia, “Petroleum jelly” (history, refining and EU impurity limits, with its cited sources). en.wikipedia.org/wiki/Petroleum_jelly
- American Academy of Dermatology, “Petroleum jelly.” aad.org/public/everyday-care/skin-care-secrets/routine/petroleum-jelly
- American Academy of Dermatology, “How to care for dry, cracked heels.” aad.org/public/everyday-care/skin-care-basics/dry/dry-heels
- American Academy of Dermatology, “Dermatologists’ top tips for relieving dry skin.” aad.org/public/everyday-care/skin-care-basics/dry/dermatologists-tips-relieve-dry-skin
- Xu S, Kwa M, Silverberg JI et al., “Consumer preferences, product characteristics, and potentially allergenic ingredients in best-selling moisturizers,” JAMA Dermatology, 2017; summary by Northwestern University. news.northwestern.edu/stories/2017/september/moisturizers-for-skin-disorder-sufferers
This guide is general skincare information, not medical advice. Draíocht is a cosmetic. For external use only; avoid contact with eyes; stop using it if irritation occurs.
More skin guides: HA for your body · HA + niacinamide · How to use HA serum · Read a serum label · Body serums compared · Dry, crepey skin