Best Vitamin & Nutrient Deficiency Tests — 2026

Cerascreen Vitamin D Test is the most popular home health test in Europe and the gold standard for home vitamin D testing. ISO 15189 accredited laboratory with quantitative results and deficiency assessment. Vitamin D deficiency affects 40% of Europeans — this test is essential for preventive health monitoring.

Medichecks Vitamin D Blood Test is the best value UKAS accredited Vitamin D test with the fastest turnaround. Doctor-reviewed quantitative results in 1–2 business days. Best for UK users.

Cerascreen Vitamin B12 Test provides an affordable, accurate measurement of total Vitamin B12. ISO 15189 accredited. Particularly important for vegans, vegetarians, and those on metformin or PPIs. Note that total B12 may not reflect active B12 — holotranscobalamin (active B12) is more accurate.

Medichecks Active B12 Test measures holotranscobalamin — the active form of B12 that is actually available to cells. This is a more accurate indicator of B12 status than total B12, which can be normal even when active B12 is deficient. The gold standard for B12 assessment.

Cerascreen Ferritin Test measures ferritin — the best marker for iron deficiency. ISO 15189 accredited. Particularly important for women (menstruation), athletes, and vegetarians. Ferritin can be falsely elevated by inflammation, so results should be interpreted alongside symptoms.

Cerascreen Omega-3 Index Test measures the Omega-3 Index — the most accurate long-term marker of omega-3 status. An Omega-3 Index below 8% is associated with increased cardiovascular risk. ISO 15189 accredited. Important for users who supplement with fish oil or want to assess cardiovascular risk.

Cerascreen Magnesium Test measures intracellular magnesium in red blood cells — more accurate than serum magnesium, which can be normal even when intracellular stores are depleted. ISO 15189 accredited. Important for users with muscle cramps, fatigue, or heart palpitations.

Cerascreen Zinc Test provides an ISO 15189 accredited measurement of zinc status. Important for immune function, wound healing, and reproductive health. Note that zinc status is difficult to measure accurately — results should be interpreted alongside symptoms.

Medichecks Vitamin Panel combines Vitamin D, B12, Folate, and Ferritin in one test — the four most commonly deficient nutrients in Europe. UKAS accredited with doctor-reviewed results in 1–2 business days. Excellent value for a comprehensive nutritional assessment.

Cerascreen Folate Test measures red blood cell folate — the most accurate long-term marker of folate status. Critical for women planning pregnancy, as folate deficiency in early pregnancy increases neural tube defect risk. ISO 15189 accredited.

Cerascreen Cortisol Stress Test provides a 4-point cortisol profile over the day, assessing both cortisol levels and the daily rhythm. Disrupted cortisol rhythm is associated with chronic stress, adrenal fatigue, and sleep disorders. ISO 15189 accredited.

Cerascreen CoQ10 Test measures both ubiquinol and ubiquinone — the two forms of CoQ10. Particularly important for statin users (statins deplete CoQ10) and those with mitochondrial health concerns. ISO 15189 accredited.

Medichecks Well Woman Blood Test is the most comprehensive women's health panel available at home, covering 15+ markers including hormones, thyroid function, key nutrients, and full blood count. UKAS accredited with doctor review in 1–2 business days. Outstanding value for a complete women's health assessment.

Medichecks Well Man Blood Test is the most comprehensive men's health panel available at home, covering 12+ markers including testosterone, PSA, cholesterol, thyroid, and key nutrients. UKAS accredited with doctor review in 1–2 business days.

Testera Vitamin D Rapid Test from Antfarma is the most affordable CE-marked Vitamin D screening test available in EU pharmacies. Provides a qualitative result in 10 minutes. For monitoring supplementation or precise values, a lab-based test is recommended.