A 2026 cross-sectional study of 146 teenagers found that those with lower vitamin B12 levels had significantly higher rates of restless legs syndrome and worse sleep quality. Teenagers with deficient or borderline B12 levels experienced RLS more frequently than those with sufficient B12. While this research shows a strong connection between low B12 and RLS in adolescents, it cannot prove that B12 deficiency causes the condition—only that they occur together.
A new study of 146 teenagers found that those with lower vitamin B12 levels were more likely to experience restless legs syndrome (RLS)—a condition where your legs feel uncomfortable and you need to move them, especially at night. The research also showed that teens with RLS had worse sleep quality overall. While this cross-sectional study can’t prove that low B12 causes RLS, it suggests an important connection worth investigating further. Vitamin B12 helps your brain make dopamine, a chemical involved in leg movement control, which may explain why B12 levels matter for this condition.
Key Statistics
A 2026 cross-sectional study of 146 adolescents aged 10-16 years found that serum vitamin B12 levels were significantly lower in teenagers with restless legs syndrome compared to those without the condition.
In the same study, teenagers with restless legs syndrome had statistically higher Pittsburgh Sleep Quality Index scores, indicating substantially worse sleep quality than their peers without RLS.
When teenagers were divided into three groups by B12 status, the prevalence of restless legs syndrome was statistically higher in those with deficient or borderline vitamin B12 levels compared to the sufficient group.
The 2026 research showed that vitamin B12 status appeared to be related to overall sleep quality in the adolescent population, suggesting B12 may affect sleep through multiple biological pathways.
The Quick Take
- What they studied: Whether vitamin B12 levels are connected to restless legs syndrome in teenagers, and how RLS affects sleep quality.
- Who participated: 146 teenagers aged 10-16 years who visited pediatric clinics. Researchers checked their vitamin B12 levels, tested them for restless legs syndrome, and asked about their sleep quality.
- Key finding: Teenagers with lower vitamin B12 levels had significantly higher rates of restless legs syndrome compared to those with normal B12 levels. Teens with RLS also reported much worse sleep quality.
- What it means for you: If you’re a teenager with restless legs at night and poor sleep, getting your B12 levels checked might be worth discussing with your doctor. However, this study shows a connection, not proof that low B12 causes RLS, so more research is needed before making treatment decisions.
The Research Details
This was a cross-sectional study, which means researchers looked at a group of teenagers at one point in time rather than following them over months or years. All 146 teenagers who visited pediatric clinics were evaluated for restless legs syndrome using official diagnostic criteria from the International RLS Study Group. Researchers measured their blood vitamin B12 levels and had them complete a detailed sleep quality questionnaire called the Pittsburgh Sleep Quality Index (PSQI). They then compared B12 levels, RLS symptoms, and sleep quality between teenagers who had RLS and those who didn’t.
The teenagers were divided into three groups based on their B12 levels: deficient (very low), borderline (somewhat low), and sufficient (normal). Researchers looked at how many teenagers in each group had restless legs syndrome. They also checked other blood markers like iron, folate, and glucose to make sure these weren’t explaining the results instead of B12.
This approach is useful for spotting connections between factors like B12 levels and health conditions. However, because it’s a snapshot in time rather than following people over time, it can’t prove that low B12 actually causes RLS—only that they tend to occur together. This type of study is often the first step before doing longer, more expensive studies that can prove cause-and-effect.
The study used established, validated tools for diagnosing RLS and measuring sleep quality, which is good. The sample size of 146 is reasonable for this type of research. However, because this is a cross-sectional study, we can’t be certain about cause-and-effect. The researchers were honest about this limitation. The study was published in a respected pediatric journal, which suggests it met quality standards for publication.
What the Results Show
The main finding was clear: teenagers with restless legs syndrome had significantly lower vitamin B12 levels compared to teenagers without RLS. When researchers divided teenagers into three groups based on B12 levels (deficient, borderline, and sufficient), they found that RLS was much more common in the deficient and borderline groups.
The second major finding involved sleep quality. Teenagers with RLS had much higher scores on the sleep quality questionnaire, which means their sleep was significantly worse. They reported more trouble falling asleep, staying asleep, and feeling rested during the day.
Interestingly, other blood markers that are known to affect RLS—like iron levels, folate, and hemoglobin—were similar between the two groups. This suggests that B12 might be uniquely important for RLS in teenagers, separate from these other factors.
The study found that vitamin B12 status appeared to be related to overall sleep quality in this teenage population, not just in those with RLS. This suggests that B12 might affect sleep through multiple pathways. The researchers noted that the connection between B12 and RLS was found in unadjusted analyses, meaning they didn’t account for other factors that might influence the relationship, so further analysis would be helpful.
According to Gram Research analysis, this study fills an important gap because most previous research on RLS has focused on dopamine dysfunction and iron metabolism, with very little data in teenagers specifically. The finding that B12 is connected to RLS makes biological sense because B12 is a cofactor—a helper molecule—in the production of dopamine, the brain chemical that controls movement. This study is one of the first to explore this connection in young people, where data has been limited and inconsistent.
The biggest limitation is that this is a cross-sectional study, so it shows a connection but cannot prove that low B12 causes RLS. It’s possible that having RLS causes people to have lower B12, or that some other factor causes both. The study doesn’t tell us whether treating low B12 would improve RLS symptoms. Additionally, the study was done at pediatric clinics, so the teenagers studied might not represent all teenagers. The researchers didn’t adjust their analysis for other factors that might influence the results, such as diet, medications, or other health conditions.
The Bottom Line
If you’re a teenager experiencing restless legs, especially at night, and you have poor sleep quality, ask your doctor to check your vitamin B12 levels. This is a simple blood test. If your B12 is low or borderline, your doctor might recommend B12 supplements or dietary changes. However, this research shows a connection, not proof of cause-and-effect, so treatment decisions should be made with your doctor based on your individual situation. Confidence level: Moderate—the connection is clear in this study, but more research is needed.
Teenagers with restless legs syndrome and sleep problems should definitely discuss B12 testing with their doctor. Parents of teenagers with these symptoms should know about this potential connection. Healthcare providers treating adolescents with RLS should consider checking B12 levels as part of their evaluation. This research is less relevant for people without RLS symptoms.
If low B12 is the cause of your RLS, it typically takes several weeks to months of supplementation to see improvement in symptoms. B12 levels gradually build up in your body, and it takes time for the nervous system to respond. Don’t expect overnight results, but consistent treatment should show benefits within 4-12 weeks.
Frequently Asked Questions
Can low vitamin B12 cause restless legs syndrome in teenagers?
Research shows a strong connection between low B12 and RLS in teenagers, but this study cannot prove B12 deficiency causes RLS. The relationship exists, but more research is needed to confirm whether treating low B12 improves RLS symptoms.
What are the signs of restless legs syndrome in teens?
RLS causes uncomfortable sensations in the legs (tingling, crawling, aching) that make you need to move them, especially at night or when sitting. Symptoms typically get worse in the evening and improve with movement, disrupting sleep and daily activities.
How can I get my B12 levels checked?
Ask your doctor for a simple blood test that measures serum vitamin B12 levels. This is a standard test available at any clinic or hospital. Results typically come back within a few days and show whether your B12 is deficient, borderline, or sufficient.
How long does it take for B12 supplements to help restless legs?
If low B12 is contributing to your RLS, improvement typically takes 4-12 weeks of consistent supplementation. B12 builds up gradually in your body, and the nervous system needs time to respond to normalized levels.
What foods have vitamin B12 for teenagers?
B12 is found mainly in animal products: eggs, milk, cheese, yogurt, meat, poultry, and fish. Some fortified cereals and plant-based milks also contain B12. Vegetarians and vegans should pay special attention to getting enough B12 from fortified foods or supplements.
Want to Apply This Research?
- Track the frequency and intensity of restless leg sensations each night on a scale of 1-10, along with your sleep duration and quality rating. Record this daily for at least 4 weeks before and after any B12 supplementation to see if there’s improvement.
- If you have low B12, use the app to set reminders for taking B12 supplements at the same time each day. Also track foods high in B12 (like eggs, dairy, meat, and fortified cereals) to ensure you’re getting enough from your diet alongside any supplements.
- Create a monthly dashboard showing your average RLS severity score, total sleep hours, and sleep quality rating. Compare these metrics month-to-month to see if B12 supplementation is helping. Share this data with your doctor at follow-up appointments to evaluate whether treatment is working.
This research shows a connection between vitamin B12 levels and restless legs syndrome in teenagers, but cannot prove that low B12 causes RLS. This article is for educational purposes only and should not replace professional medical advice. If you or your teenager experiences restless legs, poor sleep, or suspect B12 deficiency, consult with a healthcare provider for proper evaluation, testing, and treatment. Do not start or stop any supplements without discussing with your doctor first. Individual results may vary, and treatment decisions should be based on your specific health situation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.