That's complete bullshit.
B12 is an essential nutrient. There is no B12 in berries, fruits, leaves etc. There are no vegetables that contain B12.
A B12 deficiency causes many health problems, including permanent brain damage.
What are the symptoms of vitamin B12 deficiency?
Vitamin B12 deficiency can cause physical, neurological and psychological symptoms. The symptoms of vitamin B12 deficiency can develop slowly and can get worse over time. Some people may have no symptoms despite having a low level of vitamin B12 in their bodies. People with vitamin B12 deficiency can have neurological symptoms and/or damage without anemia (lack of red blood cells).
General physical symptoms of vitamin B12 deficiency can include:
Neurological symptoms of vitamin B12 deficiency can include:
- Numbness or tingling in your hands and feet.
- Vision problems.
- Having a hard time remembering things or getting confused easily.
- Having a difficult time walking or speaking like you usually do.
- If neurological problems develop from vitamin B12 deficiency, they may not be reversible.
Psychological symptoms of vitamin B12 deficiency can include:
- Feeling depressed.
- Feeling irritable.
- Experiencing a change in the way you feel and behave.
Vitamin B12 deficiency is a lack of vitamin B12 in your blood. It happens if you aren't eating enough vitamin B12 or if you have trouble absorbing it.
my.clevelandclinic.org