Nitrous oxide, commonly used as an anesthetic during surgery, does not damage DNA or interfere with vitamin B metabolism during short surgical procedures in healthy people. A 2026 study of 18 surgical patients found that 1.5 hours of nitrous oxide exposure caused no changes in DNA damage markers, gene activity, or vitamin B12 and folate levels compared to patients who didn’t receive the gas. According to Gram Research analysis, these findings validate the continued safe use of nitrous oxide in minimally invasive procedures.
Nitrous oxide, commonly known as laughing gas, is one of the most popular anesthetics used during surgery. Scientists have long worried that it might damage DNA and interfere with vitamin B metabolism. A new study of 18 healthy surgical patients examined whether short-term exposure to nitrous oxide during anesthesia caused any genetic damage or vitamin problems. According to Gram Research analysis, the findings show that 1.5 hours of nitrous oxide exposure did not harm DNA, change gene expression, or affect B vitamin levels in healthy patients. This research provides reassurance that nitrous oxide remains safe for routine surgical procedures.
Key Statistics
A 2026 study of 18 healthy surgical patients found that 1.5 hours of nitrous oxide anesthesia did not increase DNA damage, alter vitamin B12 or folate levels, or change the activity of protective genes compared to patients receiving other anesthetics alone.
Research published in Molecular Biology Reports showed that nitrous oxide exposure during surgery did not modulate the expression of DNA repair genes (OGG1 and XRCC1) or antioxidant genes (HO-1) in healthy surgical patients.
A molecular analysis of 18 surgical patients found no differences in homocysteine levels or antioxidant concentrations between those exposed to nitrous oxide and control patients, indicating normal vitamin B metabolism during short-term anesthetic use.
The Quick Take
- What they studied: Whether nitrous oxide (laughing gas) used during surgery damages DNA or interferes with vitamin B12 and folate metabolism in the body.
- Who participated: 18 healthy adult surgical patients without serious health conditions. Half received nitrous oxide during surgery, and half received only other anesthetics.
- Key finding: Nitrous oxide did not cause DNA damage, did not change how genes worked, and did not affect vitamin B levels or homocysteine (a marker of B vitamin metabolism) in healthy patients after 1.5 hours of exposure.
- What it means for you: If you’re having surgery and your doctor uses nitrous oxide, this research suggests it’s safe for your genes and vitamins in the short term. However, this study only looked at healthy people having brief procedures, so results may differ for people with health conditions or longer surgeries.
The Research Details
This was a controlled research study where scientists compared two groups of surgical patients. One group received nitrous oxide mixed with other anesthetics, while the other group received only the other anesthetics without nitrous oxide. Both groups had their blood tested and cells examined at three time points: before surgery, during the 1.5-hour surgery, and 24 hours after surgery.
The researchers used several advanced laboratory techniques to check for problems. They used a test called a comet assay to look for breaks in DNA strands. They measured how active certain genes were using a technique called RT-qPCR, specifically looking at genes responsible for fixing DNA damage and protecting cells from harm. They also measured vitamin B12, folate (vitamin B9), homocysteine levels, and antioxidants in the blood using specialized chemistry equipment.
This approach allowed the scientists to detect even small changes in genetic material or metabolism that might indicate harm from the anesthetic.
Nitrous oxide has been used safely in surgery for over 150 years, but scientists have theoretical concerns that it might interfere with vitamin B12 function and cause DNA damage. By directly measuring DNA damage and gene activity in real patients, this study provides concrete evidence rather than just theory. This type of molecular-level testing is the gold standard for determining whether a drug is truly safe at the genetic level.
This study has both strengths and limitations. Strengths include the use of multiple advanced laboratory techniques to measure different aspects of potential harm, and the careful timing of measurements before, during, and after surgery. The main limitation is the small sample size of only 18 people per group, which means the results might not apply to everyone. The study also only looked at healthy people, so we can’t be sure the results apply to people with existing health problems. Additionally, the study only measured short-term effects (24 hours), so we don’t know about any potential long-term effects from repeated nitrous oxide exposure.
What the Results Show
The most important finding was that nitrous oxide did not cause DNA damage in healthy surgical patients. While the researchers did observe a small increase in DNA strand breaks after surgery in both groups (those who received nitrous oxide and those who didn’t), this increase was the same in both groups. This suggests the DNA damage came from the stress of surgery itself, not from the nitrous oxide anesthetic.
Nitrous oxide also did not change how genes worked. The researchers measured three specific genes involved in DNA repair and cell protection, and none of them showed different activity levels in the nitrous oxide group compared to the control group. This is important because if nitrous oxide were damaging cells, we would expect to see these protective genes turn on more strongly.
Finally, nitrous oxide did not affect vitamin B metabolism. Blood tests showed no differences between groups in vitamin B12 levels, folate (vitamin B9) levels, or homocysteine (a marker that increases when B vitamins are low). Antioxidant levels, which protect cells from damage, also remained normal in both groups.
The study found that surgical stress itself caused a temporary increase in DNA damage markers in all patients, regardless of which anesthetic they received. This is a normal response to the physical stress of surgery and resolved within 24 hours. The body’s natural repair systems appeared to handle this stress-related damage without problems in both groups.
This study addresses a long-standing theoretical concern about nitrous oxide that has existed since scientists discovered it could interfere with vitamin B12 in the laboratory. Previous research in test tubes and animals suggested potential risks, but human studies directly measuring these effects have been limited. This research provides the most direct molecular evidence to date that short-term nitrous oxide use in healthy humans does not cause the genetic or metabolic problems that laboratory studies suggested might be possible.
The study’s main limitation is its small size—only 18 people in each group. Larger studies might detect effects that this smaller study missed. Second, all participants were healthy adults without medical conditions, so the results may not apply to elderly patients, people with liver or kidney disease, or people with vitamin deficiencies. Third, the study only measured effects for 24 hours after surgery, so we don’t know about effects from repeated nitrous oxide exposure over months or years. Finally, the study only looked at 1.5 hours of nitrous oxide exposure, so results might differ for longer surgeries requiring longer anesthetic exposure.
The Bottom Line
Based on this research, nitrous oxide appears safe for use during routine surgical procedures in healthy adults. The evidence is moderately strong for short-term use (1.5 hours or less) in people without significant health problems. Patients should not avoid nitrous oxide based on genetic safety concerns for brief surgical procedures. However, people with vitamin B deficiencies, liver disease, or kidney disease should discuss nitrous oxide use with their anesthesiologist, as this study doesn’t provide information about these populations.
This research is most relevant to healthy adults undergoing routine surgery who are concerned about anesthetic safety. It’s also important for anesthesiologists and surgeons who need evidence-based information about nitrous oxide safety. People with chronic health conditions, vitamin deficiencies, or those undergoing very long surgeries should have individual conversations with their medical team, as this study doesn’t specifically address their situations.
Any potential effects from nitrous oxide would likely appear within hours to days after surgery. This study measured effects up to 24 hours post-surgery and found no problems. If you’re having surgery with nitrous oxide, you should feel reassured that genetic damage is not a concern based on current evidence.
Frequently Asked Questions
Is laughing gas safe to use during surgery?
For healthy people undergoing routine surgery, yes. A 2026 study of 18 surgical patients found that 1.5 hours of nitrous oxide exposure caused no DNA damage, gene changes, or vitamin B problems. However, people with health conditions should discuss this with their anesthesiologist.
Does nitrous oxide damage your genes or DNA?
Not during short surgical procedures in healthy people. Research showed that nitrous oxide did not cause DNA strand breaks or change how protective genes worked during 1.5-hour surgeries. Any DNA changes observed were from surgical stress, not the anesthetic.
Can nitrous oxide affect your B vitamins?
Not during brief anesthesia in healthy individuals. A 2026 study measured vitamin B12, folate, and homocysteine levels in surgical patients and found no changes from nitrous oxide exposure, indicating normal vitamin B metabolism.
Who should avoid nitrous oxide anesthesia?
This study only examined healthy people, so results may not apply to those with liver disease, kidney disease, vitamin deficiencies, or certain genetic conditions. Discuss your specific health situation with your anesthesiologist before surgery.
How long does nitrous oxide stay in your body?
Nitrous oxide is eliminated quickly from the body, typically within hours. This study measured effects up to 24 hours after surgery and found no lasting changes in DNA, genes, or vitamin levels, suggesting no accumulation of harmful effects.
Want to Apply This Research?
- If using a health app before and after surgery, track energy levels and recovery markers (like return to normal activity) at 24 hours and 1 week post-surgery. This study suggests these should return to normal without complications from nitrous oxide exposure.
- No specific behavior changes are needed based on this research. If you were previously avoiding nitrous oxide due to genetic safety concerns, this study suggests you can safely accept it as an anesthetic option for routine procedures.
- For routine surgical patients, standard post-operative monitoring (checking for normal recovery, energy levels, and return to activities) is sufficient. No special monitoring for genetic or metabolic effects is needed based on this research.
This research applies specifically to healthy adults undergoing short surgical procedures (1.5 hours or less) with nitrous oxide anesthesia. The findings may not apply to people with chronic health conditions, vitamin deficiencies, liver or kidney disease, or those undergoing extended surgeries. This article is for educational purposes and should not replace consultation with your healthcare provider or anesthesiologist. Always discuss anesthetic options and any concerns about your specific medical situation with your surgical team before your procedure. If you have a history of vitamin B deficiency or neurological conditions, inform your anesthesiologist before surgery.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.