B401
In short
B401 is a specific vitamin deficiency involving a lack of biotin and other B-complex nutrients in the diet.
In plain words
Your body needs B vitamins to stay healthy and turn food into energy. If you do not eat enough of them, you might feel tired or develop skin problems. This condition happens when your diet is missing key nutrients.
A simple example
A person following a very strict, restrictive diet might stop eating enough whole grains and eggs. This can lead to a drop in B-vitamin levels in their blood.
Why it matters
Low levels of these vitamins can affect your brain, skin, and hair. It is important to manage this to prevent long-term fatigue or nerve issues.
Easy to mix up
It is often confused with general fatigue or other specific vitamin deficiencies like B12 deficiency.