Black Seed Oil in the Belly Button: What the Anatomy Actually Says
The black seed oil belly button trend arrived the way most wellness trends arrive now — as a short video with a confident voiceover and no sources. The claim, repeated across thousands of clips, is that the navel is a shortcut: that oil placed there is absorbed directly into the bloodstream, reaches the gut and the liver, and does something that swallowing the same oil apparently would not. Some versions name a "pechoti gland" sitting behind the navel, connected to tens of thousands of vessels. It is a memorable story. It is also not what the navel is. This article sets out what is actually under your navel, what happened to the vessels that once ran through it, where the Ayurvedic tradition genuinely sits, and what the honest answer looks like.
For our own oil, see our cold-pressed Ethiopian black seed oil.
The Short Answer
- The navel is skin over a scar. In an adult it is ordinary keratinised skin at the point where the abdominal wall was once tethered to the umbilical cord — not an opening, and not a gland.
- The umbilical vein — the vessel that genuinely carried blood before birth — closes in the first days of life and obliterates into the ligamentum teres hepatis, the round ligament of the liver. It becomes a fibrous cord, not a channel.
- There is no "pechoti gland" in the medical literature. The term returns zero records in PubMed and zero in Europe PMC, and it does not appear in standard anatomical nomenclature.
- Nabhi chikitsa — navel treatment — is a genuine, documented Ayurvedic tradition, and the nabhi is discussed at length in the classical texts. What is not in those texts is a pechoti gland, or the claim that oil in the navel enters the bloodstream.
- Every published study in which thymoquinone crossed skin used an engineered delivery vehicle — nanovesicles, liposomes, or chemical penetration enhancers — precisely because plain oil does not cross well on its own.
- Sidr & Stone's black seed oil is independently verified at 2.67% thymoquinone per batch by Analytice, an ISO-accredited French laboratory — a measured figure you can check, which is a more useful thing to look for than a novel application site.
What Your Navel Actually Is
Before birth, the umbilical cord carried one vein and two arteries between the placenta and the fetal circulation. That arrangement ends at delivery. The arteries constrict first; the vein closes shortly afterwards, which is why a newborn's umbilical vein remains cannulable for roughly two weeks and an adult's does not. Each vessel then fibroses into a ligament.
| Structure before birth | What it becomes in an adult |
|---|---|
| Left umbilical vein | Ligamentum teres hepatis — the round ligament of the liver |
| Two umbilical arteries | Medial umbilical ligaments |
| Urachus (the stalk to the bladder) | Median umbilical ligament |
| Cord attachment site | The umbilicus — a scar in the abdominal wall |
Anatomy references are consistent on this. Flynn and Vickerton's Anatomy, Abdomen and Pelvis: Abdominal Wall chapter in StatPearls (PMID 31869113) describes the ligaments converging on the umbilicus; Heil and Bordoni's Embryology, Umbilical Cord chapter (PMID 32491422) sets out the closure sequence and the round-ligament outcome. There is one well-described situation in which the umbilical and paraumbilical veins reopen: portal hypertension, where recanalisation produces the engorged abdominal veins known as caput medusae. That is a sign of advanced liver disease, not a normal route, and nobody selling navel oil is describing it.
One popular detail is worth correcting because it is repeated so often. The navel is not a patch of skin with nothing behind it. A five-cadaver dissection study by Asakuma and colleagues in Surgical Innovation in 2019 (PMID 30191768) found a small fascial defect deep to the centre of the umbilicus — which is why surgeons use it as a natural access point for single-port laparoscopy — but also found fatty tissue immediately beneath the central skin, with the skin itself intact. The surgical usefulness of the umbilicus comes from cutting through it, not from anything passing through it on its own.
The "Pechoti Gland" and Why You Will Not Find It in an Anatomy Book
The pechoti is the load-bearing part of the whole trend. If it exists, the rest follows; if it does not, the mechanism collapses. So it is worth being specific rather than dismissive.
Searching PubMed for pechoti returns no results at all — the database offers an unrelated Russian word instead. Europe PMC, which indexes around 44 million records including MEDLINE, PMC, preprints and patent-linked literature, returns a hit count of zero. The term does not appear in Terminologia Anatomica, the international standard for anatomical naming. It appears in wellness articles, product listings and social media, and essentially nowhere else. Even the consumer health sites that cover the trend concede there is no clinical evidence the structure exists.
| The claim | What is actually documented | Honest verdict |
|---|---|---|
| A "pechoti gland" sits behind the navel | Zero records in PubMed; zero in Europe PMC; absent from Terminologia Anatomica | Not a described anatomical structure |
| It connects to tens of thousands of vessels reaching every organ | No source in the anatomical literature | Unsupported |
| Oil in the navel passes directly into the bloodstream | The umbilical vein obliterates into the round ligament in infancy | Anatomically closed in a healthy adult |
| There is no fat under the navel, so absorption is easier there | Asakuma et al., Surgical Innovation, 2019 (PMID 30191768) found fat immediately beneath the central umbilical skin | Contradicted by dissection |
| Navel oiling is an ancient practice | Nabhi is discussed in the classical Ayurvedic texts; nabhi puran appears in the indexed literature | The tradition is genuine; the mechanism claims are modern additions |
It is worth separating two different questions here, because they get conflated. "Does a pechoti gland exist?" is a question about anatomy, and the answer is that no such structure is described anywhere in the medical literature. "Is navel oiling a real tradition?" is a question about history, and there the answer is yes. Those are not the same question, and answering the first honestly does not require dismissing the second.
Nabhi Chikitsa: The Tradition, Described Accurately
The Ayurvedic material on the nabhi is substantial and specific, and it deserves better than being used as a citation of convenience. A 2017 review by Satani, Raghavani and Bhatt in the Journal of Ayurveda and Integrated Medical Sciences collects the classical references: the Sushruta Samhita places the nabhi between the amashaya and the pakvashaya (Sharirasthana 7/5) and counts it among the marma, the vital points (Sharirasthana 6/25); the Charaka Samhita lists it among the fifteen koshthangas (Sharirasthana 7/10); the Ashtanga Hridaya names it a seat of pitta (Sutrasthana 12/2). Sira and dhamani — channels — are described as originating from the nabhi (Sushruta, Sharirasthana 9/2).
The practice of filling the navel with warm oil, nabhi puran, is real and still used. It appears in the indexed biomedical literature in a 2024 case report in the Journal of Ayurveda and Integrative Medicine (PMID 38241882), where it was one of several concurrent interventions in a single patient. That is the entire indexed footprint: one case report, one patient, multiple simultaneous treatments. There is no controlled trial of navel oiling with any substance.
What is striking is that the review's own authors argue against the flattest reading. They suggest that treating nabhi as simply "the navel" does not make sense of the classical descriptions, and that it more plausibly denotes a central physiological process. In other words, the most literal interpretation — a hole in your stomach that leads to your organs — is not the one the tradition's own scholars defend. The "72,000 channels reaching every organ" figure and the bloodstream claim are not in the classical citations. They are contemporary accretions, added on the way to the algorithm.
What Getting Anything Through Skin Actually Requires
Skin is a barrier before it is anything else, and the barrier is the stratum corneum — the outermost layer of dead, flattened, lipid-embedded cells. Bos and Meinardi's much-cited review in Experimental Dermatology in 2000 (PMID 10839713) set out the practical consequence as the "500 Dalton rule": molecules much above 500 Da rarely cross intact skin in meaningful quantity, which is why virtually every drug in a transdermal patch sits below that ceiling.
Permeability also varies by body site. A 2022 systematic review by Feschuk and colleagues in the Journal of Toxicology and Environmental Health, Part B (PMID 35094673) pooled in-vitro human data across fifteen anatomical locations and found that site mattered more than the penetrant's own physicochemical properties, with hair-follicle density doing much of the work. The abdomen was not among the more permeable sites. And the umbilicus was not among the fifteen locations at all — there is no published permeability measurement for umbilical skin. That is a genuine gap rather than a hidden answer, and it should be stated as one.
Thymoquinone specifically has been studied crossing skin, and the pattern in that literature is the most informative thing in this article.
| Study | Model | Vehicle | What it showed |
|---|---|---|---|
| Haq & Michniak-Kohn, Drug Delivery, 2018 (PMID 30463442) | Human cadaver skin, Franz diffusion cells | Ethanol / propylene glycol with chemical enhancers | Usable thymoquinone flux was achieved only with penetration enhancers present |
| Bruno et al., Journal of Controlled Release, 2022 (PMID 36228953) | Human stratum corneum and viable epidermis | Engineered oleic-acid vesicles with 15% ethanol | 22.63 ± 1.49% of applied thymoquinone permeated, using the nanovesicle |
| Mostafa et al., AAPS PharmSciTech, 2018 (PMID 30218265) | Ex vivo skin | Liposomes in a chitosan gel | Formulated delivery system, not plain oil |
| Zaid Alkilani et al., Pharmaceutics, 2025 (PMID 39861696) | Ex vivo skin | Spanlastic nanovesicle gel | Formulated delivery system, not plain oil |
| Plain black seed oil, applied to umbilical skin | — | — | No published study exists |
The Bruno paper is unusually candid about why the vesicle was built at all: thymoquinone's physicochemical properties are, in the authors' framing, not suitable for overcoming the stratum corneum. Researchers construct ethosomes and nanoemulsions because a plain oil base does not get thymoquinone through skin efficiently. A drop in the navel is a plain oil base.
The Objections Worth Taking Seriously
"Absence of evidence is not evidence of absence." Fair, and worth conceding: nobody has run a pharmacokinetic study of navel-applied oil, in humans or animals. But this is not a case of an untested question. The specific mechanism being claimed — a direct route from the navel into the circulation — is not unstudied. It is described, and it closed in your first fortnight of life. When a claim rests on a structure that anatomy has already accounted for, the burden sits with the claim.
"People say they feel better." They do, and that is not nothing — but it is not evidence of navel absorption either. Navel oiling involves warmth, occlusion, a few minutes of abdominal massage and a nightly ritual, any of which can feel good on its own. Digestive symptoms also fluctuate, so anything begun on a bad week tends to be followed by a better one. Without a comparison group, none of that can be attributed to the site of application.
"Are you dismissing traditional medicine?" No. The nabhi material is textually attested and we have cited it above by chapter and verse. Our position is narrower than dismissal: the tradition is real, and the pechoti gland and the bloodstream mechanism are not part of it. Defending a tradition does not require defending claims that were bolted onto it in the last decade.
Is It Harmful?
Probably not, for most people, but the honest answer is that the risk is unquantified rather than measured. There is no case report in PubMed or Europe PMC of dermatitis or irritation caused by oil applied to the navel — we looked, and we would rather tell you that than cite something that does not exist.
Two things are worth knowing anyway. The umbilicus is a deep, occluded, poorly ventilated skin fold that accumulates debris and carries a dense microbial population; adult omphalitis, though rare, is associated with retained material rather than with any particular substance. And black seed oil itself has a documented contact-allergy signal: Kurihara and colleagues, writing in Contact Dermatitis in 2020 (PMID 32232855), identified thymoquinone as the causative allergen in Nigella sativa oil contact dermatitis, with cross-reactivity to tert-butylhydroquinone. If you use black seed oil anywhere on skin, patch-test it on a small area first. Our guide to black seed oil side effects and safety covers this in more detail, and our article on black seed oil and the scalp works through what an oil does and does not do on skin generally.
The Better Question
If black seed oil interests you, the useful question is not where to put it but what is in the bottle. Thymoquinone content varies enormously between retail products — Khaikin and colleagues, in Nutrients in 2022 (PMID 36079759), measured 3.08 to 809.4 mg per 100 g across eleven commercial oils, a spread of more than 260-fold. Two bottles labelled identically can differ by two orders of magnitude in the compound the research is actually about.
That is the variable worth controlling, and it is checkable in a way that a navel is not. For a fuller walkthrough, see our guide to choosing a quality black seed oil, and our explainer on thymoquinone for why the compound matters. For practical use — dose, timing, taste — our guide to using black seed oil is the place to start. It should be said plainly that the wider evidence base for black seed oil is itself early: an umbrella review by Li and colleagues in Frontiers in Nutrition in 2023 (PMID 37057067) graded 88 of 110 pooled outcomes as very low certainty. That is the honest state of things, and it is a reason to buy carefully rather than a reason to look for a novel delivery site.
Why Sidr & Stone
This article has spent most of its length taking a claim apart. The reason we can do that without embarrassment is that our own case rests on a number anyone can check rather than a mechanism nobody can find.
- Independently verified 2.67% thymoquinone, tested per batch
- Tested by Analytice, an ISO-accredited French laboratory
- Organically grown Ethiopian highland Nigella sativa — selected after a 36-supplier evaluation
- Cold-pressed below 40°C to protect the heat-sensitive thymoquinone
- 100% pure — a single ingredient, nothing added
- Unrefined, which preserves the oil's natural integrity and means you may see fine natural sediment
- Bottled in matte black UV-protective glass
- Halal certified
- 10% of profits to charity
- Fulfilment in the UK, EU, and US
We will not tell you Sidr & Stone is the strongest or the best — that would be exactly the kind of unfalsifiable claim this article has been arguing against. What we will say is that our thymoquinone figure is 2.67%, independently verified per batch, and the certificate is there to read.
Frequently Asked Questions
Does putting black seed oil in your belly button do anything?
Nothing has been demonstrated. There is no published pharmacokinetic study of navel-applied oil in humans or animals, and the anatomical route the trend describes — the umbilical vein — obliterates into the round ligament of the liver in infancy. Any pleasant sensation is more plausibly warmth, occlusion and massage than absorption at that particular site.
Can anything you put in your navel reach your bloodstream?
Only in the way anything on skin can: by crossing the stratum corneum, which strongly favours small molecules under roughly 500 daltons. There is no separate navel route. Published permeability data cover fifteen anatomical sites and the umbilicus is not one of them, so there is no measurement showing it is more permeable than anywhere else.
What is the pechoti gland?
It is a term that circulates in wellness content and does not appear in the medical literature. A search returns zero records in PubMed and zero in Europe PMC, and it is absent from standard anatomical nomenclature. No dissection, imaging study or anatomy text describes such a structure.
Will black seed oil in the belly button flatten your stomach?
No study supports that, and we would not claim it. The one adjacent trial we could find applied oil to the whole abdomen rather than the navel, and measured tape and caliper readings in an unblinded design. Abdominal fat is a whole-body energy question, not a topical one — for anything concerning your weight or metabolism, speak to a qualified medical professional.
Is navel oiling really part of Ayurveda?
Yes, as a practice. The nabhi is discussed in the Sushruta Samhita, the Charaka Samhita and the Ashtanga Hridaya, and nabhi puran — filling the navel with oil — appears in the indexed literature. The pechoti gland and the bloodstream mechanism are not part of that classical material; they are recent additions.
Is it harmful to put oil in your belly button?
There is no published case report of harm from oil applied to the navel, so the risk appears low but is genuinely unmeasured. The umbilicus is an occluded fold that accumulates debris, and thymoquinone has been identified as a contact allergen in Nigella sativa oil dermatitis, so patch-test on a small area first and stop if the skin reacts.
How should I actually use black seed oil?
As a food. Most of the human research uses oral doses, taken with food, over a defined period — our guide to using black seed oil covers dose and timing. If you want to use it topically, use it on skin as an emollient and judge it on how the skin feels, not on what it is claimed to reach.
Is black seed oil a medicine?
No. Black seed oil is a food supplement, not a medicine. It has a long traditional history and an interesting body of research around thymoquinone, and can be a worthwhile part of a healthy routine — but it does not cure diseases and is not a substitute for medical care. Be cautious of any black seed oil marketed with specific disease-cure claims.
Final Thoughts
The belly button trend is a good example of a claim that is easy to spread and easy to check, and almost nobody checks it. The vessel it depends on closed within days of your birth and became a ligament. The gland it names has no entry in any anatomical database. The tradition it borrows from is real, well documented, and says something rather more careful than the videos do.
None of that makes black seed oil less interesting. It makes the interesting part sit somewhere else — in the composition of the oil, in the thymoquinone that varies more than 260-fold between retail bottles, and in whether the producer will publish a number you can hold them to. That is a question with an answer, which is more than the navel offers.
Our cold-pressed Ethiopian black seed oil — independently verified at 2.67% thymoquinone — is available now, with fulfilment in the UK, EU, and US.
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Disclaimer: This article describes published anatomical and dermatological research, and the Ayurvedic textual tradition, as they stand at the time of writing; research findings and reference sources may change, and readers should check current sources. Black seed oil is a food supplement, not a medicine, and is not a substitute for medical treatment of any condition. For any health concern, consult a qualified medical professional.