Salt Water Gargles and Nasal Rinses: What Sources Say and the Water Safety Rule
What sources say about salt water gargles and saline nasal rinses, and the water-safety rule from the FDA: distilled, sterile or boiled-and-cooled water, never straight tap water.
Content last updated . This page has not been medically reviewed.
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What is Salt-Water Gargles and Nasal Rinses good for?
What the body uses it for, and how strong the evidence is. A normal job in the body is not proof that extra supplements add benefit; each card says which.
Saline nasal rinses for nose and sinus conditions
Preliminary or mixedA 2022 systematic review of 69 studies (10 meta-analyses and 59 randomized trials) recommended nasal saline for most sinonasal diseases, with the best device depending on the condition and age. A 2026 review of eight trials in rhinosinusitis found the results statistically fragile.
Supplements: Promising but limited; fragile trial results.
Isotonic versus stronger (hypertonic) saline
Preliminary or mixedThe 2022 review found isotonic saline preferred over hypertonic saline because it caused fewer adverse events, and buffered isotonic saline was better tolerated than nonbuffered or hypertonic.
Supplements: Based on one review; exact mixing strengths are not given here.
Salt water gargles and sore throat: mainstream advice
Preliminary or mixedThe NHS lists gargling warm salty water as a way to soothe a sore throat, says to spit it out without swallowing, says children should not try it, and notes most sore throats clear in about a week.
Supplements: Soothing advice only; not shown to cure or shorten a sore throat.
Gargling to prevent colds: the trial tested plain water, not salt water
Preliminary or mixedIn 387 healthy adults in Japan followed for 60 days, plain water gargling was linked to fewer upper respiratory infections than usual care. Diluted povidone-iodine showed no clear difference from usual care.
Supplements: Salt water versus plain water: proper evidence not found in the sources we read.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Health goals (1)
- Breathing SupportPreliminary or mixed
Saline rinses for nose and sinus problems: promising but limited, results fragile.
Body systems (2)
- Respiratory HealthPreliminary or mixed
Saline rinses are recommended in a 2022 review for most sinonasal diseases, but a 2026 review found the trial results fragile.
- Respiratory SystemPreliminary or mixed
Nose and sinus conditions: promising but limited evidence for saline rinses.
Conditions & symptoms (3)
- SinusitisPreliminary or mixed
A 2022 review recommended nasal saline for most sinonasal diseases; a 2026 review found rhinosinusitis trials statistically fragile.
- Sore ThroatPreliminary or mixed
The NHS lists warm salt water gargling as a way to soothe a sore throat; no trial of salt water was found.
- RhinitisPreliminary or mixed
The 2022 review found large-volume devices worked better for adults with allergic rhinitis.
Documented risks and interactions (5)
- Nasal rinse water safety: use distilled, sterile or boiled-and-cooled water. The FDA says tap water is not suitable for a nasal rinse. Safe choices are distilled or sterile water, tap water boiled for 3 to 5 minutes and cooled to lukewarm, or water passed through a filter made to trap infectious organisms. Organisms in tap water that stomach acid may neutralize can survive in the nose and cause serious infections that are rarely fatal.
- Immune-compromised people and worsening symptoms. The FDA says anyone with a weakened immune system should ask a health care provider before using a nasal irrigation device, and anyone whose symptoms worsen or who gets fever, nosebleeds or headaches should go back to a provider.
- Children and nasal rinsing or gargling. The FDA says very young children may not tolerate rinsing, that some children with nasal allergies from about age 2 may use a device if a pediatrician recommends it, and to check with a provider first. The NHS says children should not try salt water gargles.
- Swallowing the gargle. The NHS says to spit the salty water out and not swallow it. The sources we read give no figures for harm from swallowing a mouthful. If someone swallows a large amount and seems unwell, call Poison Help (US 1-800-222-1222) or your local emergency number.
- Sore throat emergency signs. The NHS lists trouble breathing, being unable to swallow, drooling and a high-pitched sound when breathing as reasons to call 999 or go to A&E; children under 5 with a sore throat need to see a GP.
The claim as marketed: a salt water gargle or a saline nasal rinse is a gentle, natural way to ease a sore throat or a stuffy nose. What we found: both are mainstream, low-cost habits, and the evidence for them is modest. The one rule that matters most is about the water used for the nose.
The water-safety rule for nasal rinsing
The US Food and Drug Administration (FDA) says to rinse only with distilled, sterile or previously boiled water. [1] It says tap water is not safe for a nasal rinse because it is not adequately filtered or treated. [1] Some tap water carries low levels of organisms, including amoebas, that may be safe to swallow because stomach acid kills them. [1] In the nose, though, those organisms can stay alive and cause potentially serious infections, and the FDA notes they can even be fatal in rare cases. [1]
The FDA page lists the safe water types: distilled or sterile water labeled as such, tap water boiled for 3 to 5 minutes and then cooled until lukewarm, or water passed through a filter designed to trap infectious organisms. [1] It also says to wash the device and let it dry between uses. [1] The CDC's sinus-rinsing page (July 2025) also says to use distilled, sterile or boiled-and-cooled water, but gives a shorter boiling time: a rolling boil for 1 minute, or 3 minutes above 6,500 feet, then let it cool. [6] The two agencies differ on boiling time, so check the instructions that come with your device.
If your immune system is not working properly, the FDA says to check with your health care provider before using any nasal irrigation system. [1] If symptoms get worse, or you develop fever, nosebleeds or headaches while rinsing, it says to go back to your health care provider. [1] Problems with these devices can be reported to the FDA's MedWatch program; see Side Effects, Allergic Reactions and Reporting.
Salt water gargles: what sources say
Mainstream advice. The UK National Health Service (NHS) lists gargling with warm, salty water among ways to soothe a sore throat, and says children should not try it. [2] It says to spit the solution out and not swallow it. [2] The NHS adds that sore throats are usually caused by viruses or smoking and normally get better within a week. [2]
Research. The best-known gargling trial we read tested plain water, not salt water. In 387 healthy adults followed for 60 days in Japan, water gargling was linked to fewer upper respiratory infections than usual care. [3] The group using diluted povidone-iodine did not show a clear difference from usual care in that trial. [3]
Proper evidence not found for salt water specifically versus plain water. We searched PubMed for gargle trials involving saline or salt water and found no trial comparing the two that we could read. The NHS advice is common-practice guidance, and we did not find in its text a trial it relies on.
Saline nasal rinses: what reviews found
| Question | What the source found | Strength of evidence |
|---|---|---|
| Do saline rinses help nose and sinus conditions? | A 2022 systematic review of 69 studies recommended nasal saline for most sinonasal diseases, with results varying by condition and device. [4] | Promising but limited |
| Which saline strength is gentler (allergic rhinitis)? | For allergic rhinitis, the same review found isotonic saline preferred over hypertonic saline because of fewer adverse events. [4] | Promising but limited |
| How firm are the trial results? | A 2026 review of eight trials found moderate-to-high statistical fragility: small outcome changes could reverse conclusions. [5] | Mixed |
These results are for rinses made and delivered as in those studies; they do not tell you that home-mixed solutions or any particular device perform the same way.
When to see a clinician
The NHS lists trouble breathing, being unable to swallow and drooling as emergency signs for a sore throat. [2] In the US, call 911 for those. See a clinician if a sore throat lasts more than a week, keeps returning, or comes with a very high temperature. [2] For children, ask a pediatrician first: the FDA says very young children may not tolerate rinsing, and some could use it from about age 2 if a pediatrician recommends it. [1]
Related reading: Natural Does Not Mean Safe, Detox Claims Checked and Baking Soda: Household Uses and Health Claims Checked.
Frequently asked questions
Can I use tap water in a neti pot?
The FDA says tap water is not safe for a nasal rinse because it is not adequately filtered or treated. [1] It lists distilled or sterile water, previously boiled and cooled water, or specially filtered water as safe types. [1]
Why is tap water a problem in the nose but fine to drink?
The FDA explains that organisms in some tap water may be harmless to swallow because stomach acid kills them, but can survive in the nasal passages and cause serious infections. [1]
Does a salt water gargle cure a sore throat?
No source we read says it cures one. The NHS lists it as a way to soothe a sore throat, notes sore throats usually clear within a week, and says children should not try it. [2]
Is plain water gargling any different from salt water?
A randomized trial in healthy adults found fewer upper respiratory infections with plain water gargling than with usual care. [3] We did not find a readable trial comparing salt water with plain water.
Should I swallow the gargle?
The NHS says to spit it out and not swallow it. [2] If a child or anyone swallows a large amount of salt solution and seems unwell, call Poison Help at 1-800-222-1222 (US).
References
- U.S. Food and Drug Administration, Is Rinsing Your Sinuses With Neti Pots Safe? (consumer update, current as of 04/28/2025). Read 2026-10-23.
- NHS (UK), Sore throat (page last reviewed 08 April 2024). Read 2026-10-23.
- Satomura K et al., Prevention of upper respiratory tract infections by gargling: a randomized trial. Am J Prev Med 2005. Read 2026-10-23.
- Optimal Device and Regimen of Nasal Saline Treatment for Sinonasal Diseases: Systematic Review. PubMed 35720767. OTO Open 2022. Read 2026-10-23.
- The Statistical Fragility of Saline Nasal Irrigation for Rhinosinusitis: A Systematic Review. PubMed 42053165. The Laryngoscope 2026. Read 2026-10-23.
- Centers for Disease Control and Prevention, How to Safely Rinse Sinuses (page dated 2025-07-16). Read 2026-10-24.