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Vitamin B7 (Biotin)
99.00
This test measures Vitamin B7 (Biotin) levels linked to hair, skin, and energy metabolism. Deficiency can affect nails, fatigue, and skin quality.
Turnaround time
8 days
Biomarkers count
1
Same-Day Appointments
UKAS Accredited Labs
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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.
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Details about Vitamin B7 (Biotin)
What is a Vitamin B7 (Biotin) test?
A Biotin test measures the level of Vitamin B7 in your blood. Biotin is essential for converting food into energy and supports the health of hair, skin, and nails.
It also plays a role in fatty acid metabolism, nervous system function, and cellular growth.
Why do I need a Biotin test?
Low biotin levels may present with hair thinning, brittle nails, skin issues, and fatigue.
Reasons for testing include:
• Hair thinning or hair loss
• Brittle nails
• Skin rashes or dryness
• Persistent fatigue
• Poor diet or restrictive diet
• Digestive or absorption issues
• Long-term antibiotic use
Benefits of the test
1. Assesses hair and nail health factors
2. Helps explain skin issues
3. Supports energy metabolism assessment
4. Detects hidden nutritional deficiency
5. Useful in digestive or absorption issues
6. Linked to fatty acid metabolism
7. Guides targeted supplementation
8. Supports nervous system health
Expanded benefit explanation
Biotin is crucial for keratin structure and energy production. Identifying deficiency helps address cosmetic and metabolic concerns.
Step-by-step — How testing works
We offer two UK-wide testing options:
Clinic testing
• Choose nearest UK clinic
• Blood sample collected
• Laboratory analysis performed
• Results securely returned
Home visit (+£60)
• Phlebotomist visits you
• Blood sample collected safely
• Sample sent to lab
• Results delivered confidentially
Your results explained
Low levels
May indicate poor diet, malabsorption, or increased metabolic demand.
Normal levels
Indicates adequate Biotin status.
High levels
Usually related to supplementation.
How It Works
Simple steps to get your results
1
Book Online
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
2
Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
3
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
Frequently Asked Questions
It measures circulating biotin (Vitamin B7) levels to assess nutritional status and metabolic support.
No. Fasting is not required for biotin testing.
Yes. High-dose biotin can interfere with thyroid, hormone, and cardiac markers, making testing important.
Poor intake, gut malabsorption, long-term antibiotics, and certain metabolic conditions.
True deficiency is rare, but sub-optimal levels are more common than expected.
Yes. We offer at-home phlebotomy blood draws across various UK locations.
Testing is performed in UKAS-accredited laboratories using validated analytical methods.
Results are typically available within 10 business days.
Yes, if possible, stop high-dose supplements 24–48 hours before testing to improve accuracy.
A GP consultation is optional, but recommended if your results are outside the normal range.
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