Mineral Oil.
A lubricant excipient in supplements. Also used as a traditional laxative, but not ideal for long-term use. Lubricates supplement manufacturing equipment and tablet surfaces. Not a health ingredient at excipient doses.
Reviewed March 2026
- Category
- General
- Also filed under
- Manufacturing lubricantMild laxative (standalone use)
What Mineral Oil is, and what it does.
- Does it work
- Pure excipient. Has a legitimate (but declining) use as a laxative at much higher doses.
- How much to take
- Not applicable as a supplement. As a laxative: 15-45mL (but modern options are better).
- Time to feel it
- It works during manufacture and on the tablet surface, not inside you. It isn't an active and has no onset of its own. At excipient amounts nothing here is timed to a dose.
- The first dose
- At excipient amounts, day one is simply the tablet behaving properly. It isn't absorbed and has no dose timeline of its own, because its work is done on the tablet surface.
- With regular use
- At excipient levels, no concerns. Long-term laxative use can deplete vitamins A, D, E, and K.
- How well tolerated
- Well tolerated at trace excipient amounts. Problematic at therapeutic laxative doses long-term.
- How it feels
- There's nothing to sense at excipient levels, and that is the design. It's a lubricant keeping tablets releasing cleanly, not an active with a subjective effect.
- The overlooked benefit
- It has no ester bonds, so pancreatic lipase can't touch it and it passes through unabsorbed. That chemical inertness is exactly why it works as a lubricant and carrier.
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
- Well tolerated as excipient
- Depletes fat-soluble vitamins
Questions people ask about Mineral Oil.
- Should I worry about mineral oil in my supplements?
- No. The trace amounts used as lubricant in manufacturing are negligible. You get more mineral oil exposure from touching a treated cutting board.
- Is mineral oil the same as petroleum?
- It's derived from petroleum, but heavily refined and purified to pharmaceutical grade. The final product is very different from crude oil.
- Does mineral oil block vitamin absorption?
- At laxative doses (15-45mL), yes. At the trace amounts in supplements (under 1mg), absolutely not.
- Why do some brands avoid mineral oil?
- Consumer perception. Some people don't want petroleum-derived ingredients regardless of safety data. Brands respond to market preferences.
- Is mineral oil well tolerated in long-term use?
- As an excipient in supplements, yes. As a laxative, no. Long-term laxative use should be supervised by a doctor.
- What are alternatives to mineral oil in supplements?
- Magnesium stearate, stearic acid, and MCT oil are common alternatives. All are functionally similar as manufacturing lubricants.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Mineral oil is not digested or absorbed, so retinol partitions into the oil phase and stays in the gut lumen instead of entering mixed micelles. Taken in the same window it lowers how much vitamin A reaches circulation.
Cholecalciferol needs bile salt micelles to cross the intestinal wall, and it dissolves preferentially into mineral oil that the gut cannot take up. Co-dosing carries a share of the vitamin D straight through.
Tocopherols are highly lipophilic and distribute into the mineral oil phase rather than into absorbable micelles. The result is less tocopherol delivered when the two are taken together.
Phylloquinone depends on bile and micelle formation for uptake, and mineral oil holds it in the lumen. Because vitamin K supports normal clotting factor production, the timing matters for anyone relying on a steady intake.
Menaquinone-7 is absorbed with dietary fat through micelles, so a non-absorbable oil in the same meal captures part of the dose. Separating the two by several hours removes the overlap.
Carotenoids are among the most lipophilic dietary compounds and dissolve readily into mineral oil that the intestine cannot absorb. Less beta-carotene reaches the enterocyte for cleavage into retinal.
Lutein uptake depends on incorporation into mixed micelles with digestible fat. Mineral oil takes up the xanthophyll instead and carries it through unabsorbed.
Lycopene is a non-polar hydrocarbon carotenoid with strong affinity for any oil phase present. When that phase is mineral oil, the carotenoid is not delivered to the intestinal wall.
Ubiquinone is a large lipophilic quinone that relies on dietary fat and micelle formation for the limited absorption it gets. A mineral oil phase in the same dose competes for it and lowers delivery.
Astaxanthin is a lipophilic carotenoid that depends on mixed micelle formation to cross the intestinal wall. Non absorbed mineral oil in the gut lumen provides a competing oil phase that lipophilic compounds partition into and then leave with. The interaction is one of physical partitioning, not of chemistry, and it applies to oral mineral oil rather than to topical use.
Zeaxanthin behaves like the other xanthophyll carotenoids and requires dietary fat and bile for micellar uptake. Mineral oil taken orally is not digested or absorbed, so any zeaxanthin that dissolves into it passes through unabsorbed. Separating the doses in time is the usual formulation and dosing response.
Tocotrienols are the unsaturated side chain members of the vitamin E family and are absorbed by the same fat dependent route as tocopherols. A non absorbable oil phase in the lumen reduces the fraction that reaches the enterocyte. The same reasoning applies to any vitamin E form on a label.
Mixed tocopherol preparations are fully lipophilic and are taken up in mixed micelles alongside dietary fat. Oral mineral oil sequesters them in a phase the gut does not absorb. This is the same established interaction that applies to vitamins A, D and K.
Retinol and retinyl esters are absorbed with dietary fat after micellar solubilisation. Non absorbed mineral oil competes for those lipophilic molecules and carries them through. Preformed vitamin A and its provitamin carotenoid precursors are both affected.
Plant sterols are poorly absorbed to begin with and depend on micellar incorporation for the fraction that does cross. An unabsorbed oil phase reduces that fraction further. Both agents act inside the intestinal lumen, so the timing of the doses is what determines whether they meet.
Curcumin is highly lipophilic and already absorbs poorly, which is why so many formulations exist to improve it. A non absorbable oil in the same lumen offers a phase for it to dissolve into and leave with. Read this as a dosing separation point rather than a formulation pairing.
Ubiquinol is a large lipophilic quinol whose absorption depends on bile and dietary fat. Mineral oil taken by mouth provides a competing unabsorbed lipid phase. The same applies to the ubiquinone form.
Dietary long chain fatty acids are hydrolysed by lipase and taken up as free fatty acids and monoglycerides. Mineral oil is a mixture of saturated hydrocarbons with no ester bonds, so lipase does not act on it and it stays in the lumen. Its presence dilutes the lipid phase from which absorbable fatty acids are extracted.
EPA follows the same digestion and micellar uptake route as other long chain fatty acids. An unabsorbed hydrocarbon oil in the same compartment competes as a solvent phase. Separating oral mineral oil from a fish oil dose is the practical consequence.
MCT oil is a triglyceride that is hydrolysed and absorbed, with medium chain fatty acids passing largely into the portal circulation. Mineral oil is a hydrocarbon that is not hydrolysed at all. The two look alike on a label and behave in opposite ways in the gut, which is a distinction worth stating plainly.
Squalane and mineral oil are both used as occlusive emollients that slow water loss from the skin surface. In a topical base they are interchangeable in function and are sometimes combined to tune spreadability and feel. This is formulation practice on the skin, entirely separate from the oral absorption interaction.
Ceramides supply the lipid species that make up the skin barrier, while mineral oil sits on top as an occlusive film that reduces transepidermal water loss. The two work at different levels of the same barrier. Mineral oil does not integrate into the lamellar lipid structure the way ceramides do.
Both are used in the gut lumen to alter stool consistency, psyllium by holding water in a viscous gel and mineral oil by acting as a lubricant that resists absorption. Their effects add rather than overlap. Viscous fibre also slows the absorption of anything else taken at the same time, which compounds the mineral oil effect on fat soluble nutrients.
Phospholipids are the natural emulsifiers of the gut and are part of what forms mixed micelles with bile salts. Adding a phospholipid emulsifier changes how an oil phase disperses in the lumen. Mineral oil remains unabsorbed regardless, so what shifts is the partitioning of the other lipophilic compounds present.
Talk to a doctor before taking Mineral Oil if any of these apply to you: Blocks fat-soluble vitamin absorption (A, D, E, K), Aspiration risk in elderly, Not for long-term use. These are flags to check first, not effects Mineral Oil is known to cause.
Not medical advice. Show the label to your pharmacist.What Mineral Oil actually does.
Mineral oil is a mix of fats without the chemical bonds the body's digestive enzyme needs to break them down, so it passes through the gut essentially unabsorbed.
Because it stays as a separate oil layer in the gut, mineral oil acts like a solvent, and anything dissolved into it leaves the body along with it instead of being absorbed.
Vitamins A, D, E and K, along with carotenoids, all need to form tiny particles with bile to be absorbed, and an unabsorbed oil layer can get in the way of that process.
Taking mineral oil separately from meals and from fat-soluble nutrients is the usual way to avoid this interaction, since both have to be in the gut at the same time for it to happen.
Where Mineral Oil comes from.
This comes from crude oil, not from a plant. The oil is distilled to pick out the right weight of molecules, then cleaned under hydrogen pressure to strip out everything aromatic or sulphur containing until what is left is a colourless, odourless mixture of plain hydrocarbons. Thin, thick and jelly versions all come from the same stream and differ in how heavy they are.
From a mineral source, then refined and usually bound to a carrier so the body can take it up.
The starting material is a vacuum distillate cut from crude oil, chosen for its boiling range and its saturated hydrocarbon content. Chain length and the resulting viscosity of the finished oil are set at this stage.
The distillate is hydrotreated over a catalyst under hydrogen pressure, or in older routes acid treated, to saturate and remove aromatic, sulphur and nitrogen containing compounds. This step is what separates a white oil from a technical lubricant base.
Waxy paraffins are crystallised out with a solvent and removed, and the oil is polished over clay or activated carbon to strip residual colour bodies and trace aromatics.
The finished oil is tested against a pharmacopoeial or food grade monograph covering viscosity, relative density, colour, acidity, readily carbonisable substances and limits on polycyclic aromatic hydrocarbons. The grade is the specification, not a different molecule.
Fractions are blended to hit the target viscosity for light or heavy grade, or combined with microcrystalline wax to make petrolatum, then packaged under conditions that keep the oil free of particulates and moisture.
Getting Mineral Oil from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
The studies, linked.
2 sources behind our Mineral Oil verdict: peer-reviewed studies and registered clinical trials. Every one links straight to PubMed, the journal, or ClinicalTrials.gov. Read them yourself.
- Clinical trialEffect of Nano-PSO in Patients With Parkinson's Disease: Clinical Efficacy and Results in Molecular Imaging.ClinicalTrials.gov ↗170 participants, Unknown
- Clinical trialProspective Blinded Randomized Controlled Trial Evaluating the Outcomes of Cannabinoid (CBD) Roll-on Topical Stick in Primary Total Knee ArthroplastyClinicalTrials.gov ↗92 participants, Unknown
Evidence surfaced via Semantic Scholar (Allen Institute for AI) and ClinicalTrials.gov. Ranked by study type and citation weight, not cherry-picked.
Problems people have reported.
Read this carefully. These are 26,662 voluntary, unverified reactions reported to the FDA (openFDA). The number mostly reflects how popular Mineral Oil is, not how risky it is. A report is not proof Mineral Oil caused anything. It is a signal of what to watch for, nothing more.
Source: openFDA adverse-event reports. Voluntary reporting, not an incidence rate.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.
