The NHS symptoms list groups them into general anaemia symptoms (tiredness, breathlessness, headaches, loss of appetite, weight loss) and neurological signs (peripheral neuropathy, balance problems, depression, memory and concentration changes, sometimes mood changes or psychosis in advanced cases)
People with symptoms of vitamin B12 deficiency Vitamin B12 deficiency can lead to Anemia, Depression, Fatigue, Lethargy, and Numbness in the hands and feet
I have no daytime fatigue anymore and my sleep at night is regular for the first time in a decade
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In severe cases, it can lead to neurological changes and anemia