Find the best home tests for weight loss and more energy!

Which home tests are right for my goals of losing weight and having more energy?

Anyone who is unable to lose weight despite their efforts or who feels persistently lacking in energy should first investigate possible physical causes: Vitamin D deficiency, iron deficiency, or an underactive thyroid are among the most common—and often overlooked—reasons for fatigue and difficulty losing weight. The mybody®x self-tests for vitamin D, iron ferritin, and thyroid TSH levels make it easy to investigate this at home, with results available within 5–10 minutes.

For lasting results, it is also worth looking at two other components: the DNA metabolism analysis for a personalized diet and the microbiome gut test for healthy digestion—both are covered in detail in our further comparison articles.

The 3 self-tests at a glance

Test	Typical symptoms	Price	Result in
Vitamin D self-test	Fatigue, susceptibility to infections, low mood, muscle weakness	€14.50	5–10 minutes
Iron ferritin self-test	Fatigue, pale skin, hair loss, difficulty concentrating	€14.50	5–10 minutes
Thyroid TSH self-test	Fatigue, weight gain, sensitivity to cold, hair loss	€14.50	5–10 minutes

The 3 most important self-tests for identifying the cause

1. Vitamin D self-test—the classic for fatigue and lack of energy

A vitamin D deficiency often goes unnoticed for a long time, yet it is one of the most common causes of fatigue, low mood, and a weakened immune system—especially during the darker months of the year. The self-test measures the 25-hydroxy vitamin D level using a blood drop.

• Who is it suitable for: Anyone experiencing fatigue, susceptibility to infections, muscle weakness, or little exposure to sunlight.
• Price: €14.50.
• Evaluation: Blood drop (finger prick), result can be read directly after 5–10 minutes.

Conclusion: A useful first test when the cause of fatigue is unclear, especially in autumn/winter or when you spend little time outdoors.

→ Go to the product page: Vitamin D Self-Test

2. Iron Ferritin Self-Test—energy begins with oxygen transport

Iron is essential for the formation of hemoglobin and therefore for oxygen transport in the body. A low ferritin level can cause fatigue, paleness, and difficulty concentrating, often before anemia is diagnosed.

• Who it is suitable for: Particularly women with heavy periods, athletes, vegans, and people with chronic exhaustion.
• Price: €14.50.
• Accuracy: >94% according to the manufacturer's specifications.

Conclusion: An important test for fatigue combined with paleness, hair loss, or increased iron needs.

→ Go to the product page: Iron Ferritin Self-Test

3. Thyroid TSH Level Self-Test—when the metabolism slows down

The TSH level controls the release of thyroid hormones, which in turn regulate the body's energy expenditure. An underactive thyroid often manifests as fatigue, unexplained weight gain, and sensitivity to cold—and is frequently confused with other causes.

• Who it is suitable for: People who gain weight despite an unchanged diet, experience low energy, or have a family history of thyroid disorders.
• Price: €14.50.
• Important note: Self-testing is not recommended during ongoing thyroid hormone treatment, as the results may be distorted.

Conclusion: A useful initial guide if an underactive thyroid is suspected—but it does not replace medical diagnosis.

→ Go to the product page: Thyroid TSH Level Self-Test

For long-term results: the next steps

Stay committed for the long term: Understand your metabolism

Once acute deficiency causes have been ruled out, it is worth looking at your individual metabolism: the mybody® DNA Metabolism Analysis shows how your body processes carbohydrates, fats, and proteins and, including a 28-day plan & recipe book, provides a directly actionable nutrition strategy for weight loss. You can find a detailed comparison of all DNA metabolism tests in our separate article.

→ Read more: The 5 Best DNA Metabolism Tests Compared in 2026

→ Go to the product page: DNA Metabolism Analysis incl. 28-Day Plan & Recipe Book

Keep an eye on your gut health

Gut flora also plays an underestimated role in energy levels, nutrient absorption, and weight management. A microbiome gut test shows whether dysbiosis or an imbalance in gut bacteria is contributing to exhaustion. Find all the details about the available tests in our microbiome comparison article.

→ Read more: The 3 Best Microbiome Gut Tests Compared in 2026

→ Go to the product page: Darmflora MIKROBIOM-Test Complete

Conclusion: The right starting point for more energy and successful weight loss

If you are experiencing unexplained fatigue or difficulty losing weight, a quick initial assessment of the causes using the three self-tests (vitamin D, iron, and thyroid) is worthwhile—you can conveniently do it at home and receive results within a few minutes. For lasting changes, the DNA metabolism analysis and a microbiome gut test are sensible next steps to help optimize your diet and gut health in a targeted way.

Frequently asked questions (FAQ)

What commonly causes fatigue and difficulty losing weight?

Common, often overlooked causes include vitamin D deficiency, iron deficiency, and an underactive thyroid. All three can be assessed with simple at-home self-tests.

How quickly will I receive the self-test results?

All three self-tests (vitamin D, iron-ferritin, and thyroid-stimulating hormone, TSH) provide a result within 5–10 minutes of performing the test using a drop of blood.

Do the self-tests replace a visit to the doctor?

No. The self-tests provide initial guidance but do not replace a medical diagnosis. If the results are abnormal or symptoms persist, consulting a doctor is recommended.

How do I combine the self-tests with a long-term strategy?

The self-tests help identify possible acute causes of deficiencies. For a long-term nutrition and health strategy, the DNA metabolism analysis (personalized nutrition recommendations) and a microbiome gut test (gut health) are also useful.

Last updated on July 10, 2026. Reviewed by the mybody® team.