What is behind a (nutrient) vitamin deficiency?
A vitamin or nutrient deficiency occurs when your body is not adequately supplied with essential vitamins, minerals, or trace elements. These vital substances are involved in almost all important bodily functions – from energy metabolism to the immune system. If they are lacking for an extended period, the body can no longer function optimally.
The most common causes include an unbalanced diet , insufficient intake of fresh food, stress , lack of sleep , gastrointestinal disorders , a disrupted microbiome, or increased demand due to exercise, growth, pregnancy, or medication . Insufficient sunlight can also lead to a pronounced vitamin D deficiency .
Because the symptoms are often nonspecific – fatigue, hair loss, difficulty concentrating, increased susceptibility to infections, or muscle cramps – a deficiency often goes unnoticed for a long time. A blood test is therefore the most reliable way to find out which vitamins your body is truly lacking and how you can specifically improve your intake.
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Why have a blood test for a vitamin deficiency?
A blood test is the most reliable way to determine which nutrients your body is actually lacking when a vitamin deficiency is suspected . Many symptoms, such as fatigue, hair loss, a weakened immune system, or difficulty concentrating, are nonspecific – they can indicate a vitamin deficiency, but they can also have completely different causes. Without laboratory analysis, this often remains pure speculation.
A blood test precisely measures important markers such as vitamin D, B12, folic acid, ferritin/iron, magnesium, zinc, and omega-3 . This gives you a clear overview of your actual nutrient levels and helps you avoid unnecessary or incorrect supplementation.
A mybody® blood test is easy to perform at home : simply take a capillary blood sample, send it in, and receive a detailed results report with personalized recommendations a few days later. This way, you'll know exactly which measures – diet, supplements, or lifestyle adjustments – are truly effective in sustainably improving your vitamin levels.
A blood test therefore provides certainty instead of guesswork – and is the first step towards more energy, a stronger immune system and long-term well-being.
Causes of a possible vitamin deficiency
Vitamin deficiency often develops gradually and has many possible causes – far beyond "poor diet":
Common causes:
- Unbalanced diet or frequent use of processed foods
- Too little sunlight → Vitamin D deficiency
- Vegetarian/vegan diet → risk of vitamin B12, iron and zinc deficiency
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Stress & lack of sleep → increased vitamin & mineral consumption
- Gastrointestinal disorders (e.g., irritable bowel syndrome, celiac disease) → impaired absorption
- Disrupted microbiome → reduced nutrient absorption
- Hormonal changes (e.g., menstruation, pregnancy)
- Age & medications (e.g., Metformin, acid blockers)
Many people only notice their deficiency when symptoms have already progressed. Early testing helps to identify deficiencies in time, before they lead to chronic problems.
Understanding Vitamin Deficiency in Everyday Life
A vitamin deficiency can affect your well-being in almost all areas of life – even if you generally eat a healthy diet. This is because vitamins fulfill essential functions:
- Energy production (B vitamins, magnesium)
- Immune system (vitamin C, D, zinc, selenium)
- Skin, hair & nails (Vitamin A, B7/Biotin, Zinc)
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Mood & Nervous System (B12, B6, Omega-3)
- Bones & Muscles (Vitamin D, Calcium)
If just one link in this chain is missing, the entire metabolism suffers. Fatigue, muscle tension, skin problems, flaky skin, depressive moods, or increased susceptibility to infections can result from a single vitamin deficiency.
Therefore, it is important to know the actual status – instead of only treating symptoms superficially.
Optimize your diet with a blood test – easily from home
A blood test will show you which vital nutrients your body is truly lacking . The mybody® tests are simple and convenient:
- Order test kit
- Take a capillary blood sample from the fingertip
- Send sample to certified laboratory
- Online results report with clear recommendations
The report shows you which vitamin levels are within the normal range, which are slightly low, and which urgently need improvement. You will also receive specific recommendations:
- Which foods you should incorporate more of
- Whether supplements are useful and in what form
- Which lifestyle factors (sun, stress, sleep) influence your values
This way you can specifically optimize your diet and often notice improvements in energy levels, skin condition and sleep after just a few weeks.
What are the consequences of vitamin deficiency?
Untreated vitamin deficiencies can cause both short-term discomfort and long-term health problems. Possible consequences include:
Short-term consequences:
- Exhaustion & low energy
- Lack of concentration
- Weak immune system
- Mood swings
- Muscle weakness
- Hair loss & brittle nails
- Skin problems, redness & dryness
Long-term consequences:
- Vitamin D deficiency → bone loss, susceptibility to infections, muscle weakness
- Iron/ferritin deficiency → anemia, shortness of breath, decreased performance
- Vitamin B12 deficiency → nerve damage, memory problems
- Folic acid deficiency → changes in blood count
- Omega-3 deficiency → inflammation, concentration problems
- Zinc/selenium deficiency → hormonal fluctuations, metabolic disorders
Early testing therefore protects you not only from acute deficiencies, but also from long-term damage.
Why does my diet affect my vitamin levels?
Your vitamin levels depend heavily on your diet, as the body cannot produce many vitamins itself. However, it's not just about what you eat, but also how your body processes food.
Nutrition affects your vitamin levels because:
- Too little fresh food → too few vital nutrients
- Too much sugar and processed foods → nutrient deficiency despite high calorie intake
- Your gut flora determines how many vitamins you absorb.
- Stress & alcohol → increase vitamin consumption
- Fat-soluble vitamins (A, D, E, K) → require sufficient healthy fats
- Plant-based diet → requires B12, iron & zinc intake
Your diet determines how well you are supplied with vitamins — but only a blood test will show you in black and white which values are really lacking.
Recognize vitamin deficiencies and take targeted action
Headaches caused by vitamin deficiency – causes and solutions. Headaches can be a sign of a vitamin deficiency. In particular, a lack of B vitamins, such as vitamin B12, can lead to such symptoms. A balanced diet rich in these vitamins can provide relief. If symptoms persist, it is advisable to have your vitamin levels checked.
Iron deficiency as a trigger for fatigue and poor concentration. Iron deficiency often manifests as fatigue, difficulty concentrating, and headaches. These symptoms result from a reduced oxygen supply to the body. An iron-rich diet including meat, legumes, and leafy green vegetables can help meet the body's needs. If a deficiency is suspected, a blood test should be performed.
Vitamin deficiency as a possible trigger for migraines. Migraine attacks can be triggered by a deficiency in certain vitamins, such as vitamin D and B vitamins. Adequate intake of these nutrients can help reduce the frequency and intensity of attacks. It is recommended to monitor vitamin levels regularly and supplement if necessary.
Poor concentration due to inadequate nutrient supply. A deficiency in essential nutrients, such as iron and B vitamins, can lead to poor concentration and reduced mental performance. A balanced diet containing these micronutrients supports cognitive function. If concentration problems persist, it is advisable to have your nutrient intake checked.
Recognize the symptoms of a vitamin B12 deficiency early. A vitamin B12 deficiency can lead to fatigue, difficulty concentrating, and neurological symptoms. Vegans and older people are particularly at risk. Early diagnosis through a blood test allows for targeted treatment and prevents long-term health problems.
The role of vitamin D in headache prevention. Vitamin D plays an important role in overall well-being. A deficiency can be associated with symptoms such as fatigue and headaches. Regular sun exposure and, if necessary, taking supplements can help maintain optimal vitamin D levels.
FAQs - You asked, we answered:
Why should I regularly check my nutrient intake?
A balanced supply of nutrients is essential for energy, performance, and overall well-being. The Nutrient | VitalCheck Basic helps you identify potential deficiencies early and address them effectively. This allows you to prevent fatigue, concentration problems, and other ailments.
What is the difference between VitalCheck Basic and VitalCheck Complete?
The VitalCheck Basic focuses on analyzing key nutrients such as vitamin D3, magnesium, and iron. The VitalCheck Complete offers a more comprehensive examination, including additional vitamins, minerals, and trace elements, to provide a detailed picture of your nutrient status.
How can the Fitness | LifestyleCheck improve my physical performance?
The Fitness | Lifestyle Check analyzes important markers such as creatine kinase, cholesterol levels, and vitamin B12, providing insights into muscle health, metabolism, and the cardiovascular system. With this information, you can develop targeted training and nutrition strategies to efficiently achieve your fitness goals.
How does sample collection work for the mybody® tests?
Sample collection is conveniently done from home. You will receive a test kit with detailed instructions. After collection, you send the sample to our certified laboratory in the enclosed return envelope. Within a few days, you will receive a comprehensive results report with personalized recommendations.
How long will it take to receive my test results?
Once your sample arrives at the lab, you will usually receive your results within 10 to 15 business days. These will be provided to you digitally, including specific recommendations for optimizing your nutrient intake and fitness.
Are the mybody® tests suitable for everyone?
The mybody® tests are suitable for anyone who wants to proactively improve their health. Whether you are athletically active, have specific health issues, or simply want to ensure your body is optimally nourished – with the mybody® tests, you gain valuable insights into your health status.