Why can’t the child concentrate?
Parents often hear from teachers: "Your child is inattentive," "constantly distracted," "can’t sit still." The first thought is character, upbringing, or ADHD (attention deficit hyperactivity disorder). But before diagnosing, it’s worth checking something simpler: is the child getting enough key nutrients?
The schoolchild’s brain is an organ with enormous nutrient needs. It consumes up to 20% of the body’s total energy, requires fatty acids to build neurons, minerals to transmit nerve impulses, and vitamins to synthesize neurotransmitters. When something is lacking, symptoms appear that are easily confused with behavioral problems.
5 nutrients whose deficiency is most often mistaken for "behavioral problems"
1. Magnesium — the mineral of calm and concentration
Magnesium is involved in over 300 biochemical reactions in the body, including nervous system regulation. Its deficiency in children manifests as:
- increased excitability and irritability
- difficulty falling asleep, restless sleep
- muscle twitching, calf cramps
- decreased concentration
- headaches after school
For children, it is especially important to get magnesium in an easily absorbed form. Magnumcit 100 for children — magnesium + B6 for the nervous system 250 ml — magnesium in citrate form with vitamin B6, which enhances its absorption and additionally supports the nervous system.
2. Omega-3 — building material for the brain
The brain is 60% fat, and a significant portion of that is polyunsaturated omega-3 fatty acids (DHA and EPA). They are essential for:
- formation of myelin sheaths of neurons
- speed of nerve impulse transmission
- synthesis of serotonin and dopamine
- reduction of inflammation in brain tissue
Signs of omega-3 deficiency in a schoolchild: poor memory, difficulties with reading and writing, mood swings, dry skin, and brittle nails. Omega-3 for children / Omega-3 Kids 100 mg, 180 caps — a specially formulated formula for children’s bodies with optimal DHA and EPA dosage.
Read more about the role of omega-3 for the brain and immunity in our article: Omega-3 in 2026: for the heart, brain, and immunity.
3. Iron — oxygen for the brain
Iron deficiency anemia is one of the most common causes of reduced cognitive function in school-age children. Iron is necessary for transporting oxygen to the brain and synthesizing dopamine — a neurotransmitter responsible for motivation and attention.
Symptoms of iron deficiency in a schoolchild:
- paleness of skin and mucous membranes
- constant fatigue even after rest
- decreased school performance
- frequent headaches
- craving to eat chalk, soil, or ice (pica)
Iron chelate 40 mg — easily absorbed iron 120 tabs — iron in chelated form, which is absorbed much better than regular iron sulfate and does not cause stomach discomfort.
4. B vitamins — fuel for neurons
Vitamins B1, B6, B9 (folic acid), and B12 are critically important for nervous system function. They participate in neurotransmitter synthesis, protect neurons from damage, and provide energy metabolism in brain cells.
Vitamin B group deficiency in children manifests as:
- quick mental fatigue
- irritability and tearfulness
- memory deterioration
- cracks at the corners of the mouth (sign of B2 deficiency)
- numbness of limbs (sign of B12 deficiency)
Comprehensive solution — Children's multivitamin complex — 9 vitamins for kids 120 tabs, containing a balanced set of vitamins, including all key representatives of the B group.
5. Iodine — thyroid hormones and intelligence
Iodine is necessary for the synthesis of thyroid hormones, which regulate metabolism and brain development. Even subclinical (hidden) iodine deficiency lowers a child's IQ by 10–15 points according to WHO data.
Signs of iodine deficiency in a schoolchild:
- lethargy and sleepiness during the day
- weight gain without changes in diet
- decreased academic performance and memory
- feeling cold
- enlarged thyroid gland (goiter)
Table: symptoms vs nutrients
| Symptom | Possible deficiency |
|---|---|
| Hyperactivity, excitability | Magnesium, omega-3 |
| Distractibility, poor concentration | Iron, omega-3, B12 |
| Constant fatigue | Iron, B12, iodine |
| Poor sleep, night terrors | Magnesium, B6 |
| Mood swings, tearfulness | Omega-3, B6, magnesium |
| Poor memory | Omega-3, B9, iodine |
| Muscle cramps | Magnesium, calcium |
How to check for nutrient deficiencies?
The most accurate way is to get blood tests. Ask the pediatrician to prescribe:
- Complete blood count — detects anemia (iron deficiency)
- Ferritin — iron stores in the body (a more accurate indicator than hemoglobin)
- TSH (thyroid-stimulating hormone) — thyroid function (iodine)
- Vitamin D and B12 — separate tests
- Serum magnesium — although this indicator does not always reflect actual cellular deficiency
Important: even if tests are “normal” but symptoms are present, it is worth consulting a doctor about subclinical deficiency.
Nutrition as a foundation: what to add to a schoolchild’s diet
Before prescribing supplements, it is worth reviewing the child's diet:
- Magnesium: buckwheat, nuts, pumpkin seeds, dark chocolate, legumes
- Omega-3: fatty fish (salmon, mackerel, herring) 2–3 times a week
- Iron: red meat, liver, legumes, spinach (with vitamin C for better absorption)
- Vitamins B: eggs, meat, dairy products, whole grains
- Iodine: sea fish, seafood, iodized salt
However, the realities of modern nutrition are such that even with a balanced diet, children often do not get enough nutrients due to soil depletion, food processing, and selective eating habits.
When are supplements needed?
Supplements are advisable if:
- tests confirmed a deficiency
- the child has selective eating habits (does not eat fish, meat, or dairy products)
- there are chronic gastrointestinal diseases that impair absorption
- symptoms persist despite a balanced diet
- the child plays sports and has increased needs
For comprehensive support of a child's body, pay attention to Magnesium + Vitamin B6 — nerves, stress, metabolism 90 tabs — a classic combination to support the nervous system and reduce anxiety in children and adolescents.
Could this be true ADHD?
Yes, ADHD is a real neurobiological disorder that requires diagnosis and treatment by a specialist. But it is important to understand: nutrient deficiencies can mimic or worsen ADHD symptoms. Studies show that children with ADHD often have low levels of magnesium, iron, and omega-3.
Therefore, even with a confirmed diagnosis, dietary adjustments and supplements can significantly improve the child's condition and reduce the need for medication.
Read more about the role of omega-3 for the brain and nervous system in the article: Omega-3: benefits for the heart, brain, and immunity – 2026 overview.
Practical plan for parents
- Observe — record symptoms, their frequency, and time of occurrence (after school, in the morning, after meals)
- Get tests done — complete blood count, ferritin, TSH, B12, vitamin D
- Review nutrition — add foods rich in deficient nutrients
- Consider supplements — after consulting a pediatrician or pediatric neurologist
- Evaluate the results — after 4–8 weeks of regular supplement intake
Frequently Asked Questions (FAQ)
From what age can a child be given magnesium?
Magnesium in children's forms (liquid citrate) can be given to children from 3 years old. Dosage depends on the child's age and weight — always follow the instructions on the package or the doctor's recommendations.
Are omega-3 supplements safe for children?
Yes, omega-3 in children's doses are completely safe and recommended by pediatricians worldwide. It is important to choose products specially designed for children, with verified DHA and EPA content.
How quickly will results appear from taking supplements?
The first changes are usually noticeable after 3–4 weeks of regular intake. The full effect appears after 2–3 months. Do not expect instant results: nutrients work gradually, restoring deficiency in tissues.
Can a child overdose on vitamins?
If recommended dosages are followed — no. Water-soluble vitamins (B, C) are naturally excreted from the body. Fat-soluble vitamins (A, D, E, K) can accumulate, so it is important not to exceed the vitamin D dose without a blood test.
Is it necessary to give supplements in summer?
In summer, the need for vitamin D decreases (synthesized under the sun), but the need for magnesium, omega-3, and iron remains stable throughout the year. This is especially relevant for children who are actively involved in sports.
Which is better — multivitamins or individual supplements?
If deficiency is confirmed by tests, it is better to take individual supplements in therapeutic doses. For general prevention and support, a multivitamin complex is a convenient and balanced solution.
We also recommend reading: Brief and clear about the benefits of omega 3-6-9 for you — about the role of polyunsaturated fatty acids in daily health.
Material prepared by the founder of Tibetan Formula, Andriy Duyko. The information is educational and does not replace medical consultation. Consult a pediatrician before starting any supplements.