How low does B12 cause neurological symptoms?

B12 levels can cause neurological symptoms even when considered "normal," but severe issues like peripheral neuropathy, memory loss, and difficulty walking often appear with levels below 200-260 pg/mL (148-190 pmol/L), though some experts suggest levels under 400 pg/mL (300 pmol/L) may impact cognition, especially in older adults. The key is that neurological symptoms, like tingling, numbness, balance problems, or confusion, can be the only sign of deficiency, and damage can become irreversible if untreated, emphasizing the importance of early detection through tests like methylmalonic acid (MMA) beyond just serum B12.

How low does B12 have to be to cause neurological symptoms?

Background Low vitamin B12 levels (<260 pmol/L) are highly prevalent in older adults. B12 deficiency may cause demyelination resulting in clinical peripheral neuropathy and white matter damage.

Does vitamin B12 interact with amlodipine?

There were no interactions found between amlodipine and Vitamin B12. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.

Is it safe to have B12 injections when pregnant?

Yes, Vitamin B12 injections are generally considered safe and often recommended during pregnancy to treat a deficiency, supporting both maternal health (reducing fatigue, anemia) and crucial fetal development, especially for the baby's brain and nervous system, though you must always consult your OB-GYN first. Deficiency risks include neural tube defects, miscarriage, and low birth weight, so treatment isn't withheld if needed, especially for vegans, vegetarians, or those with absorption issues like after gastric bypass. 

What is a critically low B12 level?

Dangerously low B12 levels can cause severe, potentially irreversible neurological damage, including nerve degeneration (peripheral neuropathy, numbness, tingling, balance issues), cognitive decline (memory loss, confusion, dementia, psychosis), severe anemia leading to extreme fatigue, vision problems, and even paralysis, requiring prompt diagnosis and treatment to prevent permanent harm.
 

B12 Deficiency (7 Signs Doctors Miss) 2024

What level of B12 is alarming?

What Abnormal Results Mean. Values of less than 160 pg/mL (118 pmol/L) are a possible sign of a vitamin B12 deficiency. People with this degree of deficiency are likely to have or develop symptoms.

What do you crave when your B12 is low?

B12 deficiency can cause specific food cravings, particularly for meat, fish, or eggs, as your body seeks sources of the vitamin, and may also lead to sugar cravings due to its role in serotonin and energy regulation, but it can also manifest as pica (craving non-food items like ice or even bleach in severe cases). These cravings signal your body trying to correct a nutrient imbalance, but clinical testing is needed for a proper diagnosis, as emotional factors also drive cravings. 

Which trimester is B12 most important?

Two other studies found that low maternal vitamin B12 levels during the third trimester were associated with lower cognition [28,29] and social development [29] in offspring at two years of age.

Who cannot have B12 injections?

Who may not be able to have hydroxocobalamin

• have ever had an allergic reaction to hydroxocobalamin or any other medicine.
• have an allergy to cobalt.
• have been told you have low levels of potassium.
• have an irregular or fast heartbeat (arrhythmia)

How long does it take to reverse B12 deficiency?

Reversing a B12 deficiency starts quickly, with energy improvements in days to weeks, but full recovery, especially for nerve issues, can take several months to a year, depending on severity, treatment (injections are faster), and the underlying cause. Mild cases might see major improvement in 1-3 months, while long-term deficiencies or absorption problems might require ongoing injections for life. 

What vitamin does amlodipine deplete?

CALCIUM CHANNEL BLOCKERS

Examples include; amlodipine, nifedipine, felodipine, diltiazem and verapamil. Nutrients that can be depleted by these medicines are potassium, calcium, vitamin D and possibly Co-Enzyme Q10.

What cannot be mixed with B12?

When taking B12, you should avoid taking it with high doses of Vitamin C simultaneously (take them a few hours apart), limit alcohol, and be cautious with certain medications like metformin, proton pump inhibitors (PPIs), H2 blockers, and some anti-seizure drugs, as these can hinder B12 absorption. Also, avoid combining B12, folate, and B6 after a stent placement due to increased risk of blood vessel narrowing, and consult a doctor about other potential interactions like with chloramphenicol. 

What medications cannot be taken with B12?

You should be cautious taking Vitamin B12 with medications that reduce stomach acid (like omeprazole, famotidine), diabetes drugs (metformin), antiseizure meds (phenytoin, carbamazepine), colchicine (for gout), aminosalicylic acid, and potentially high doses of Vitamin C, as these can hinder B12 absorption or interfere with its effects. Always consult your doctor or pharmacist about potential B12 interactions with your prescriptions. 

How do you know if you have nerve damage from B12 deficiency?

B12 nerve damage symptoms often start as tingling, numbness (pins and needles), or burning sensations in hands and feet (peripheral neuropathy), progressing to muscle weakness, balance issues, difficulty walking (ataxia), vision problems, memory loss, confusion, and even psychiatric changes, as B12 is crucial for nerve health and severe deficiency can cause irreversible damage.
 

Can lack of B12 affect your eyes?

Vitamin B12 deficiency can significantly impact the eyes, primarily causing optic neuropathy, which damages the optic nerve, leading to gradual or sudden vision loss, blurred vision, washed-out colors, and visual field defects. It can also manifest as severe dry eyes, ocular pain, swollen optic discs, double vision (diplopia), and sometimes even pupil abnormalities, with many of these effects improving or resolving with timely B12 treatment.
 

What deficiency causes you to feel off balance?

Feeling off-balance, dizzy, or unsteady (ataxia) can be caused by deficiencies in Vitamin B12, crucial for nerve function, and Vitamin D, important for nerve signals and muscle tone, with Iron deficiency (anemia) also a common culprit due to poor oxygen supply to the brain, alongside potential roles for magnesium. These deficiencies affect your nervous system, proprioception (body awareness), and circulation, leading to balance issues, numbness, fatigue, and cognitive problems. 

Why are doctors stopping B12 injections?

Coronavirus has made it necessary to move patients on B12 injections to oral treatment. Reason: RISK REDUCTION in terms of limiting your movement outside your home and contact with our staff and nurses. Nationally all NHS organisations will be stopping injections during this difficult time.

What are signs you need a B12 shot?

You know you might need B12 injections if you have symptoms like extreme fatigue, tingling/numbness (pins and needles) in hands/feet, a sore red tongue, memory issues, depression, balance problems, or pale skin, often accompanied by a confirmed B12 deficiency via blood test, especially if you have absorption issues from conditions like Crohn's/celiac, follow a vegan diet, or are an older adult. A doctor diagnoses this through symptoms and blood tests, as many signs overlap with other conditions. 

Can a B12 injection go wrong?

While B12 injections are generally safe, side effects like redness, swelling, or pain can occur. Severe allergic reactions, such as itching or difficulty breathing, are rare but possible.

Can B12 affect fetal development?

If you're pregnant, not having enough vitamin B12 can increase the risk of your baby developing a serious birth defect known as a neural tube defect.

Is folate the same as B vitamin?

Folic acid and folate are both terms for a type of B vitamin (vitamin B9). The terms folic acid and folate are often used interchangeably. Folate is a B vitamin that occurs naturally in foods such as green leafy vegetables, citrus fruit, and beans.

What are the facial signs of B12 deficiency?

Cutaneous manifestations associated with vitamin B12 deficiency are skin hyperpigmentation, vitiligo, angular stomatitis, and hair changes. A diagnosis of vitamin B12 deficiency is often overlooked in its early stages because these signs are not specific to vitamin B12 deficiency alone.

Which fruit is B12 rich?

Apples and bananas help improve gut health, supporting better B12 absorption. Some fortified fruit juices (like orange juice) may include added B12.