What can interfere with B12?

Things that block B12 absorption include stomach acid reducers (PPIs like omeprazole, H2 blockers), the diabetes drug metformin, certain anti-seizure meds, long-term alcohol use, surgeries (gastric bypass, stomach removal), and digestive diseases (Crohn's, celiac), while high-dose Vitamin C might interfere, all hindering the stomach acid/intrinsic factor needed to release and absorb it from food.

What shouldn't you take 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 blocks absorption of vitamin B12?

Vitamin B12 absorption is blocked by factors reducing stomach acid (like PPIs, H2 blockers, alcohol, aging), conditions damaging stomach/intestine lining (Crohn's, Celiac, gastritis, pernicious anemia, surgery), lack of intrinsic factor, certain medications (metformin, nitrous oxide), and dietary gaps (veganism without supplements). These issues prevent B12 from separating from food, binding to intrinsic factor, or reaching the ileum for absorption.
 

Can B12 cause nausea?

Taking doses of vitamin B-12 might cause: Headache. Nausea. Diarrhea.

Can B12 cause tingling in fingers?

If you have had neurological symptoms that affect your nervous system, such as numbness or tingling in your hands and feet, caused by a vitamin B12 deficiency, you'll be referred to a haematologist and may need to have injections every 2 months.

B12 Deficiency (7 Signs Doctors Miss) 2024

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.

What vitamin am I lacking if my hands are tingling?

Tingling in the hands, known as paresthesia, is often caused by a deficiency in Vitamin B12, which damages nerve sheaths, but can also stem from low Vitamin E, B6, B5, Calcium, or Magnesium, affecting nerve health or causing anemia that leads to these sensations. These deficiencies impact nerve function, causing numbness, weakness, balance issues, and other neurological symptoms, so seeing a doctor for diagnosis and treatment is crucial. 

How do you feel if your B12 is too high?

Too much B12 usually doesn't cause severe issues as excess is flushed out, but high doses (especially injections) can lead to headaches, dizziness, fatigue, digestive upset (nausea, diarrhea), insomnia, anxiety, or skin rashes, with rare severe effects like heart palpitations or nerve issues in extreme cases, often resolving by stopping supplements.
 

What medications affect the absorption of vitamin B12?

Common medicines affecting vitamin B12 absorption include Proton Pump Inhibitors (PPIs), H2-receptor antagonists (H2RAs), and the diabetes drug Metformin, all reducing stomach acid or altering gut function needed for B12 release and absorption, plus antiseizure drugs like phenytoin, anti-gout meds like colchicine, and some antibiotics. Chronic use can lead to deficiency, causing fatigue, nerve issues, or anemia, requiring monitoring by a doctor, says The Economic Times and the NHS. 

What kind of B12 is best for seniors?

Active B12 is generally considered to be the best form of B12 for seniors for several reasons. Metabolically active forms of B12 such as methylcobalamin and adenocobalamin require no further conversion in the body.

Why would B12 suddenly drop?

Some conditions that affect your intestines can also stop you absorbing the necessary amount of vitamin B12. For example, Crohn's disease, a long-term condition that causes inflammation of the lining of the digestive system, can sometimes mean your body does not get enough vitamin B12.

How do you know if your body isn't absorbing vitamin B12?

B12 malabsorption symptoms often start subtly, including fatigue, pale skin, and a sore tongue, but progress to significant neurological issues like numbness, tingling, balance problems, confusion, and memory loss, alongside digestive issues (diarrhea, appetite loss) and mood changes (depression, irritability) due to nerve damage from long-term deficiency. These symptoms arise because the body can't absorb enough vitamin B12, essential for nerves, brain, and red blood cell production, leading to anemia and nerve damage. 

Can low B12 cause acid reflux?

While low B12 doesn't directly cause acid reflux, they are closely linked: chronic acid reflux (GERD) and its medications (PPIs/H2 blockers) impair B12 absorption, leading to deficiency, which then can cause digestive issues including heartburn/indigestion, creating a cycle. Stomach acid is crucial for releasing B12 from food, so reducing acid (meds, aging, H. pylori) hinders absorption, raising the risk of deficiency and its symptoms, including potential digestive discomforts. 

What makes B12 worse?

For example, proton pump inhibitors (PPIs) – a medication sometimes used to treat indigestion – can make a vitamin B12 deficiency worse. PPIs inhibit the production of stomach acid, which is needed to release vitamin B12 from the food you eat.

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 two supplements should not be taken together?

Common conflicts include calcium with iron or magnesium, zinc with iron or magnesium, and vitamin C with B12 or copper. Spacing doses prevents deficiencies and adverse effects. Supplements may also interact with medications, like calcium with thyroid drugs or herbal products with blood pressure medicines.

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. 

What are the two main causes of B12 deficiency?

Lack of vitamin B12 in your diet: People who don't eat enough foods that have vitamin B12 or don't eat foods fortified with B12 can develop a deficiency. Gastritis: Gastritis is inflammation of the stomach lining, and it's a common cause of vitamin B12 deficiency.

What cancels out B12?

There is general consensus that gastric acid–lowering drugs, including proton pump inhibitors (PPIs) and H2-receptor antagonists (H2RAs), and the antidiabetes drug metformin can reduce circulating vitamin B-12 concentrations with prolonged use.

What does B12 toxicity feel like?

Too much B12 usually doesn't cause severe issues as excess is flushed out, but high doses (especially injections) can lead to headaches, dizziness, fatigue, digestive upset (nausea, diarrhea), insomnia, anxiety, or skin rashes, with rare severe effects like heart palpitations or nerve issues in extreme cases, often resolving by stopping supplements.
 

What food is highest in B12?

The foods highest in Vitamin B12 are organ meats (like liver and kidney) and shellfish (especially clams), offering thousands of percent of the daily value in small servings, with fortified cereals, dairy, fish (salmon, tuna, sardines), and eggs also being excellent sources. For vegans, fortified foods like nutritional yeast and plant milks are key, as B12 is naturally found in animal products.
 

Who should not take B12 supplements?

While B12 is generally safe, people with Leber's disease, severe kidney disease, or known allergies to B12/cobalt should avoid it, and those taking certain meds (like metformin, stomach acid reducers), pregnant/breastfeeding individuals, or those with malabsorption issues should consult a doctor before supplementing to manage risks or check interactions. Unnecessary megadosing isn't proven beneficial and might impact the gut microbiome, so always check with a healthcare provider. 

What are the warning signs in feet of vitamin B12 deficiency?

What are the symptoms of vitamin B12 deficiency anemia?

• Weak muscles.
• Numb or tingling feeling in hands and feet.
• Trouble walking.
• Nausea.
• Decreased appetite.
• Weight loss.
• Irritability.
• Lack of energy or tiring easily (fatigue)

What are the first signs of neuropathy?

The first signs of neuropathy often involve tingling, numbness, or "pins and needles," usually starting in the feet and hands, along with heightened sensitivity to touch (even light pressure), or burning/sharp pain, especially at night, sometimes feeling like walking on "stones" or "bubble wrap". Other early indicators include muscle weakness, clumsiness, balance problems, and changes in temperature sensation, with symptoms often fluctuating and worsening over time. 

What autoimmune diseases cause tingling?

Sjogren's syndrome, lupus, and rheumatoid arthritis are among the autoimmune diseases that can be associated with peripheral neuropathy. Symptoms can range from numbness or tingling, to pricking sensations (paresthesia), or muscle weakness.