Baking Soda: Household Uses and Health Claims Checked
Baking soda (sodium bicarbonate) checked against sources: what it is, why swallowing it for heartburn or "alkalizing" carries real risks, and what trials found for teeth and kidney disease.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
Swallowing baking soda can cause serious harm. Case reports describe dangerous changes in blood chemistry and, after large amounts at once, rupture of the stomach. [1] If someone has swallowed too much, call Poison Help at 1-800-222-1222. Call 911 if the person has collapsed, had a seizure, has trouble breathing or cannot be awakened. [2] The same page lists severe headache, vomit that looks like coffee grounds, weakness and slow breathing as reasons to call a doctor right away. [2] This page gives no amounts and no how-to steps.
What baking soda is
Baking soda is the household name for sodium bicarbonate. A MedlinePlus drug page lists "baking soda" as another name for it. [2] A 2025 emergency-medicine teaching article describes it as having countless everyday uses, including cooking and cleaning. [3] The same compound is also a medicine: sodium bicarbonate is an antacid used to relieve heartburn and acid indigestion, and a doctor may prescribe it to make blood or urine less acidic in certain conditions. [2]
The claims, checked
| Claim as marketed | What the sources found | Evidence label |
|---|---|---|
| A spoonful in water fixes heartburn | It is a recognized antacid, but the MedlinePlus drug page says not to use it longer than 2 weeks unless a doctor says so. [2] Case reports document harm from swallowing it for indigestion. [4] | Established as an antacid; evidence of harm with misuse |
| It "alkalizes" the body and prevents or treats cancer | A 2016 systematic review found one eligible study and no trials; it concluded that promoting alkaline diet and water for cancer prevention or treatment is not justified. [5] | No good evidence of benefit |
| It protects the kidneys | In people with chronic kidney disease and metabolic acidosis, sodium bicarbonate raised blood bicarbonate in a 2025 meta-analysis of 22 trials, with no significant change in kidney filtration (eGFR). [6] These were clinical trials, not kitchen remedies. | Promising but limited, in a clinical setting only |
| Baking soda toothpaste cleans teeth | A 2019 systematic review of 21 trials found promising results for plaque removal in single-use studies, only partly confirmed in follow-up studies. [7] | Promising but limited (toothpaste, not swallowed) |
What heartburn guidance says
The NHS suggests speaking to a pharmacist about antacids or alginates and says they help symptoms short term but will not cure the problem. [10] It advises seeing a GP if heartburn happens most days or comes with symptoms such as food sticking in the throat, frequent vomiting, or weight loss for no reason. [10]
What a reader can safely do
Ask a pharmacist or clinician about heartburn that keeps coming back. Keep baking soda out of reach of children. For related checks see Baking Soda for Heartburn: Why Sources Advise Caution, Alkaline Water and "pH Diet" Claims and Natural Substances Not Meant to Be Swallowed. Kidney questions are covered in Kidney Disease and Supplements.
Frequently asked questions
Is baking soda the same as sodium bicarbonate?
Yes. MedlinePlus lists "baking soda" as an other name for sodium bicarbonate. [2]
Is it safe to swallow baking soda for heartburn?
Not as a casual home remedy. It is a recognized antacid, but case reports document metabolic problems and stomach rupture from swallowing too much. [4] Ask a pharmacist or clinician.
Can baking soda cure or prevent cancer?
No good evidence supports that. A systematic review found no trials of alkaline diet or water for cancer treatment. [5]
Does baking soda toothpaste work?
Trials show promising plaque results in single-use studies, only partly confirmed over time. [7]
Who should be most careful?
People with kidney disease, heart failure or high blood pressure, who are pregnant or breastfeeding, who take other medicines, and children under 12 are named on the MedlinePlus page. [2]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Why swallowing it is risky
- Body chemistry: a 1994 review lists metabolic alkalosis, high blood sodium, high blood pressure, gastric rupture and low potassium among the risks of acute and chronic oral bicarbonate. [4] A 1999 report says presentations can include seizures, abnormal heart rhythms and cardiopulmonary arrest. [8]
- Large single amounts: a 2026 report and review of 78 cases found acute, massive ingestion was often complicated by gastric rupture and associated with high mortality. [1]
- Long-term use: the same review found chronic ingestion mainly caused severe alkalosis and electrolyte problems, and noted that reasons for use had shifted to include natural remedies. [1]
- Sodium load: the MedlinePlus page says the medicine increases the amount of sodium in the body, and asks people with high blood pressure, heart failure or kidney disease to tell their doctor. [2]
- Kidney disease: one case involved a dialysis patient with life-threatening alkalosis from eating baking soda as a pica behavior. [9]
Medicines, pregnancy and children
- Medicines: the drug page says to take sodium bicarbonate at least 2 hours apart from other medicines. [2] See How Interactions Work.
- Pregnancy and breastfeeding: the page asks readers to tell their doctor if pregnant, planning pregnancy or breastfeeding. [2]
- Children: it says not to give sodium bicarbonate to children under 12 unless a doctor says so. [2]
- Pre-surgery, allergy, older adults, contamination: not described in the sources we read, so we make no claims. Tell the surgical team about anything you take regularly.
References
- Inokuchi R, Maeda A, Komaru Y, et al. Severe metabolic alkalosis and hypernatremia induced by excessive sodium bicarbonate intake: a case report and literature review. Am J Emerg Med. 2026. PubMed 41650758. Read 2026-10-23.
- MedlinePlus Drug Information (American Society of Health-System Pharmacists). Sodium Bicarbonate. Last revised 2017-04-15. Read 2026-10-23.
- Kosoko AA, Ogoke A, Vogt K. A Recipe for Disaster - Sodium Bicarbonate Overdose. J Educ Teach Emerg Med. 2025. PubMed 40766935. Read 2026-10-23.
- Thomas SH, Stone CK. Acute toxicity from baking soda ingestion. Am J Emerg Med. 1994. PubMed 8285975. Read 2026-10-23.
- Fenton TR, Huang T. Systematic review of the association between dietary acid load, alkaline water and cancer. BMJ Open. 2016. PubMed 27297008. Read 2026-10-23.
- Siddiqui AH, Batool F, Khan S, et al. Safety and efficacy of sodium bicarbonate for treating metabolic acidosis in chronic kidney disease: a systematic review and meta-analysis. World J Nephrol. 2025. PubMed 40134641. Read 2026-10-23.
- Valkenburg C, Kashmour Y, Dao A, et al. The efficacy of baking soda dentifrice in controlling plaque and gingivitis: a systematic review. Int J Dent Hyg. 2019. PubMed 30734996. Read 2026-10-23.
- Fitzgibbons LJ, Snoey ER. Severe metabolic alkalosis due to baking soda ingestion: case reports of two patients with unsuspected antacid overdose. J Emerg Med. 1999. PubMed 9950389. Read 2026-10-23.
- Sarwal A, Kim S, Gnanasekaran I. Life-threatening alkalosis from baking soda pica in an end stage renal disease hemodialysis patient. Hemodial Int. 2022. PubMed 34907640. Read 2026-10-23.
- NHS (UK). Heartburn and acid reflux. Read 2026-10-23.