Remedies › Black seed oil › Chemotherapy side effects · All remedies for chemotherapy side effects
Black seed oil and chemotherapy side effects: what the evidence says
Small or mixed human studies suggest black seed may ease some side effects of chemotherapy and radiation, such as fever, mouth sores and skin damage, but the trials were small and several had no placebo.
3/5 LimitedPromising, unprovenSome human evidence: small trials, trials on a related outcome, or population studies that disagree. What exists leans positive, but it has not had a fair test: no controlled trial on this outcome, or only small ones. How we score
Small randomized trials point to help with treatment side effects: fewer fevers during chemotherapy in 80 children with brain tumors (2.2% vs 19.3% of low-white-cell episodes), less radiation skin damage with a 5% gel in 62 women with breast cancer, fewer mouth sores with an oil rinse in 54 leukemia patients, and less heart and liver damage in two 40-child leukemia trials from one Egyptian hospital. None was large, and several had no placebo.
These trials measured side effects, not whether the cancer responded, so they say little about black seed as a cancer treatment.
Black seed can interact with cancer care: case reports describe a large bleed during chemotherapy with antiplatelet drugs, very low platelets around surgery, and bone marrow suppression in a leukemia patient. Tell the oncology team if you take it.
- Meta-analyses of trialspooled randomized trials0
- Human studiestrials and population studies6
- Case reportssingle people0
- Animal studiesmostly rodents0
- Lab studiescells, test tubes0
The studies in people, read one by one
| Result | Type | What they did | What they found |
|---|---|---|---|
| Positive | Randomized trial, 2017 80 people | Randomized controlled study (no placebo): 5 g seeds a day during chemotherapy vs nothing, children with brain tumors (Egypt) Measured: Febrile neutropenia (fever with low white cells), hospital stay | 8 of 372 neutropenic episodes had fever on black seed vs 63 of 327 in controls (2.2% vs 19.3%, p = 0.001); median hospital stay 2.5 vs 5 days. PubMed 28349493 |
| Positive | Randomized trial, 2019 62 people | Randomized, double-blind, placebo-controlled; 5% black seed gel on the skin during breast radiotherapy (Iran) Measured: Radiation skin damage, pain, skin quality of life | Radiation dermatitis was less frequent with the gel; grade 2 reactions started later (35 vs 29 days); skin-related quality of life did not differ. PubMed 31780017 |
| Positive | Randomized trial, 2019 54 people | Randomly allocated: black seed oil mouth rinse vs 'magic mouthwash' during 28 days of chemotherapy, acute myeloid leukemia Measured: Mouth sores (oral mucositis), pain, swallowing | Mouth-sore severity was lower (area under the curve 5.9 vs 38.4, P < 0.05), with less pain and better swallowing. PubMed 31781612 |
| Positive | Randomized trial, 2020 40 people | Randomized: black seed oil 80 mg/kg or placebo for a week after each doxorubicin dose, children with acute lymphoblastic leukemia (Tanta, Egypt) Measured: Heart function on echocardiography | Systolic heart function fell less on black seed than on placebo; diastolic measures did not change in either group. PubMed 31964219 |
| Positive | Randomized trial, 2015 40 people | Black seed oil 80 mg/kg/day or placebo for a week after each methotrexate dose, children with acute lymphoblastic leukemia (Tanta, Egypt) Measured: Liver toxicity; remission, relapse, survival | Liver tests rose significantly only in the placebo group; the authors report better remission, relapse, death and disease-free survival, but no difference in overall survival. PubMed 25809628 |
| Positive | Clinical trial, 2019 60 people | Single-blind clinical trial: oil applied near the IV line twice daily during chemotherapy vs no treatment Measured: Chemotherapy-related vein inflammation (phlebitis) | Phlebitis was less frequent at 60 and 72 hours and less severe at 12 and 72 hours with the oil. PubMed 31453801 |
| Positive | Systematic review / meta-analysis, 2026 | Systematic review of 9 studies of antibacterial agents to prevent mouth sores from head and neck radiotherapy Measured: Radiation-induced oral mucositis | Black seed showed potential benefit on mucositis incidence and severity; the evidence for the agents overall was called limited and inconsistent. PubMed 41731134 |
Beyond Google: 13 findings about Black seed oil from trial registries, FDA reports and patent offices that a normal search rarely shows. See them
What people report
None of the 40 public reports we read so far were about this condition. See all reports on the Black seed oil page.
Other conditions Black seed oil has been studied for
- Black seed oil and asthma 3/5 LimitedPromising, unproven
- Black seed oil and blood sugar and type 2 diabetes 4/5 ModerateHeld up in trials
- Black seed oil and cancer 2/5 PreliminaryPromising, unproven
Checked against PubMed on 2026-10-28. Everything we know about Black seed oil