How long does it take for vitamin b12 deficiency to cause permanent damage? Is it possible to reverse? 26 years old with 5 years of cognitive problems

Part reversible. Peripheral nerve damage is generally reversible and damage to central nervous system is usually not. Unless you have been a strict vegan, had stomach or small intestinal resection, Crohn disease for years, tape worm a few other things, it is unlikely that your disease is due to B12 deficiency. It would be prudent to consult a neurologist.

Related Questions

I've had symptoms of vitamin B12 deficiency for years, does it mean that ill have permanent nerve damage?

Correct diagnosis? B12 deficiency can cause spinal cord (subacute combined degeneration) or peripheral nerve problems , but usually is treatable with B12 injections. Read more...

My age 26, I have vitamin B12 deficiency, can I take 1000 mcg vitamin B12 supplement?

Are you vegan? How do you know you have a deficiency? If your doctor diagnosed, what did the doctor recommend? Why aren't you following that recommendation? Don't overthink it. If you self-diagnosed, the dosage of 1000 mcg is extremely high and unnecessary. I am more concerned why someone your age has such a critical deficiency. Don't overdoes and waste your money. Read more...

Been suffering with lhermittes for a month (mris brain&c ok). Could a 5 year addiction to nicotine gum (15x2mg daily) cause vitamin B12 deficiency?

Unrelated. . I think you are saying you have been suffering with lhermitte's sign, and there are no findings on brain and c-spine mris to justify your symptoms. You know that b-12 deficiency can cause it, so you wonder if nicotine gum has caused that. No. Start by talking to your doc about whether you have a b-12 deficiency. Some people simply can't absorb b-12. Ssri discontinuation can also cause lhermitte's. Read more...

My age 26, I have vitamin B12 deficiency, I was adviced to take methycobal tablets, are they fine?

Yes. But you need to find out why you are deficient in B12 in the first place. Are you a vegan or gluten intolerant? Read more...
Reason for low B12? Age 26 to have B12 deficiency? Have you investigated the reason? That, to me, is just as important a question to ask as the treatment. Do you have celiac disease, crohn's, severe gastritis, gastric ulcer disease? Methylcobal is fine. I'm an injector biased type of doc but very potent oral forms are said to be equivalent. http://www.methylcobalamininfo.com/methylcobalamin-vs-cyanocobalamin/. Read more...

Does vitamin B12 deficiency cause brain and nerve problems?

Yes. In the early 19th century, scientists noted weakness and numbness with B12 deficiency. Recently, B12 has been shown to upregulate neurotrophic factors (chemicals [cytokines] that help nerve cells grow) & downregulate neurotoxic factors (chemicals that break down nerve cells). In other words, B12 helps nerve cells grow and prevents their destruction by naturally occurring brain chemicals. Read more...

My mom was diagnosed a few years ago with vitamin B12 deficiency/anemia. Could this be a genetic thing?

Not exactly. Pernicious anemia as cause of B12 deficiency is an autoimmune disease. The tendency to develop autoimmune disease is genetic, but not specific for a particular condition. It is not like eye color where you can predict with certainty what will happen. Autoimmune disease is part genetic, but something else has to happen to trigger it. Read more...