herb · for bloating
Black Seed Oil
Traditionally used to settle the gut and ease trapped wind and cramping.
Say that in clinical terms
Carminative and antispasmodic properties reduce intestinal gas accumulation and smooth muscle spasm.
How strong is the research?
1 paper read, 1 supporting.
Tested as: honey-based N. sativa seed oil formulation (5 mL oil/day co-administered with honey)
Who was studied: The trials are in people with fatty liver, diabetes or metabolic syndrome, not everyday bloating.
A proper search found trials of this compound, but not in the form named here — honey-based N. sativa seed oil formulation (5 mL oil/day co-administered with honey). Evidence for one form is not evidence for another.
How much to take
daily
500–1000 mg
Carminative effects reduce intestinal gas. Take with meals.
Before you take it
- No NIH/IOM Tolerable Upper Intake Level (UL) is established for Nigella sativa or its primary bioactive thymoquinone; published clinical trials have generally been limited to 1–2 g/day of seed oil for up to 3 months.
- Thymoquinone competitively inhibits CYP2C9 (warfarin 7-hydroxylase), CYP3A4, and CYP2D6; risk modeling indicates co-administration with NS oil above approximately 1 g/day may meaningfully elevate INR in patients on warfarin; clinically relevant pharmacokinetic interactions are also expected with phenytoin and other narrow-therapeutic-index drugs, antidiabetic agents, and antihypertensives metabolized by these isoforms.
- Contraindicated in pregnancy: rodent studies document dramatic reductions in fetal survival rates at supplemental doses; a 2024 clinical trial confirmed NS accelerates uterine emptying in cases of missed abortion; no established safe human dose in pregnancy has been identified.
- Thymoquinone content in commercial black seed oils varies approximately 13- to 57-fold across products and by geographic origin; dose equivalence between commercial preparations and clinical trial formulations is unreliable without standardized thymoquinone quantification.
- High-dose use has been associated with hepatotoxicity in case reports; contact dermatitis has been reported following topical application; at least one case of DRESS (drug reaction with eosinophilia and systemic symptoms) was reported after NS oil use.
- Nigella sativa oil has been reported to cause or worsen bloating, borborygmi, and burping in some functional dyspepsia patients during NS oil trials; users seeking relief from bloating may experience exacerbation of the symptom
What we make of it
No trial has ever measured bloating as an outcome.
The detail
Bloating appears in this literature only as a mild side effect reported in both treatment and placebo groups of an indigestion trial, with no difference between them. Nobody has tested it as a thing to fix.