This test measures Vitamin B3 (Nicotinamide) levels linked to energy production and cellular repair. Deficiency can affect skin, nerves, and metabolism.
Turnaround time
8 days
Biomarkers count
1
Professional phlebotomist comes to you
+ £{{ home_visit_fee }}
Visit our clinic for your test
{{ clinic_visit_fee > 0 ? '+ £' + clinic_visit_fee : 'Free' }}
Home visits require at least 24 hours notice.
{{ clinic.full_address }}
{{ selectedClinic.full_address }}
Available time slots: {{ timeSlots.length}}
A Vitamin B3 test measures the level of nicotinamide (niacin) in your blood. Vitamin B3 is essential for converting food into energy and is a key component of NAD/NADH, which are vital for cellular metabolism and repair.
It also supports skin health, nerve function, brain health, and DNA repair processes.
Vitamin B3 deficiency can present with fatigue, skin issues, brain fog, and digestive problems, often without obvious cause.
Reasons for testing include:
• Persistent fatigue
• Brain fog or poor concentration
• Skin rashes or sensitivity to sunlight
• Digestive discomfort
• Poor diet or malabsorption
• High stress levels
• Neurological symptoms
Expanded benefit explanation
Vitamin B3 is central to energy production and cellular repair. Identifying deficiency allows correction of symptoms affecting energy, cognition, and skin health.
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
May indicate poor diet, malabsorption, or increased metabolic demand.
Indicates adequate Vitamin B3 status.
Usually due to supplementation.
Simple steps to get your results
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
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 UsFollow these guidelines for accurate results
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 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.
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.
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.
Get more insight — these panels include the same biomarker: