Vitamin B3 (Niacin) Blood Test, from our experts to you.
Dr Sam Rodgers MBBS, MRCGPChief Medical Officer

How many B vitamins are there?
Altogether, there are eight B vitamins, each with its purpose and role within the body. The B vitamins are all water-soluble and crucial for cell metabolism, normal functioning of the central nervous system, and the formation of red blood cells. All the B vitamins we need should be available through our diet. The B vitamins help to convert food into fuel and metabolise fats and proteins.
What is vitamin B3?
Vitamin B3 is in foods such as eggs, peanuts, fresh fruit and vegetables, red meat, and fortified cereals.
What are the symptoms of vitamin B3 deficiency?
Although extremely rare, vitamin B3 deficiency can occur. Symptoms include fatigue, vomiting, disorientation, memory loss, and mouth swelling. Strict vegetarians and vegans may be at risk of vitamin B3 deficiency.
What's Included?
How to prepare for your test
Special Instructions
Prepare for your Vitamin B3 (Niacin) Blood Test by following these instructions. Do not eat for 12 hours prior to your test. Drink plenty of water, if you take medication then you are allowed to take it as you would normally. You should take this test before you take any medication or vitamin/mineral supplements.