Vitamin B12 may not get as much attention as some other vitamins, but it plays an essential role in keeping the body’s blood cells, nerves, and other systems functioning properly.
For adults over 50, getting enough vitamin B12 can become especially important.
As people age, the body may become less efficient at absorbing the vitamin B12 naturally present in food. The National Institutes of Health (NIH) notes that many older adults don’t produce enough stomach acid to effectively release and absorb food-bound B12. For that reason, adults over 50 are advised to get recommended amounts of B12 from fortified foods or dietary supplements.
The problem is that vitamin B12 deficiency doesn’t always announce itself clearly.
Symptoms can develop gradually, sometimes over months or even years, and may resemble changes people associate with normal aging. Because B12 is important for red blood cell production and healthy nerve function, however, prolonged deficiency can become serious.
Here are nine potential signs adults over 50 should know.
1. Persistent Fatigue and Low Energy
Feeling unusually tired is one of the better-known symptoms associated with vitamin B12 deficiency.
Your body needs vitamin B12 to help produce healthy red blood cells. When B12 levels become too low, the body may have difficulty producing enough properly functioning blood cells to carry oxygen efficiently.
The result can be persistent fatigue, weakness, or a general feeling that you simply don’t have the energy you once did.
Vitamin B12 deficiency can cause megaloblastic anemia, and fatigue and weakness are common symptoms.
Of course, fatigue has dozens of possible causes, ranging from poor sleep to thyroid problems and medication side effects. Persistent or unexplained fatigue is worth discussing with a healthcare professional rather than assuming vitamin B12 is responsible.
2. Numbness or Tingling in Your Hands and Feet
One symptom that deserves particular attention is a recurring pins-and-needles sensation in the hands or feet.
Vitamin B12 is important for maintaining healthy nerves. When levels remain too low, nerve problems can develop.
People may experience sensations such as:
- Tingling in the feet or hands
- Numbness
- Pins and needles
- Unusual prickling sensations
- Changes in sensation
The NIH identifies numbness and tingling in the hands and feet as possible symptoms of vitamin B12 deficiency.
This is an important symptom to take seriously because prolonged B12 deficiency can damage the nervous system, even in people who have not developed anemia.
3. Trouble With Balance or Walking
Have you recently started feeling less steady on your feet?
While balance problems can have many causes, vitamin B12 deficiency is one possibility doctors may consider.
Because B12 is involved in healthy nerve function, a significant deficiency can interfere with the neurological signals involved in coordination and movement.
Someone with a deficiency might notice that walking feels less steady or that maintaining balance has become more difficult.
Both the NIH and Mayo Clinic list balance or unsteady movement problems among possible symptoms associated with B12 deficiency.
New or rapidly worsening balance problems should always receive medical attention because they can have causes unrelated to vitamin deficiency.
4. Memory Problems or Increased Forgetfulness
Everyone occasionally forgets where they left their keys or why they walked into a room.
But noticeable or worsening changes in memory deserve attention.
Vitamin B12 is involved in normal neurological function, and deficiency can sometimes cause cognitive symptoms.
The NIH lists poor memory, confusion, and even dementia-like symptoms among potential effects of B12 deficiency.
That doesn’t mean ordinary forgetfulness indicates a vitamin deficiency, nor does it mean taking B12 prevents dementia.
In fact, research has not established that simply taking additional vitamin B12 prevents cognitive decline in people who already have adequate B12 levels.
The important point is that B12 deficiency is one potentially treatable condition healthcare providers may consider when evaluating unexplained cognitive changes.
5. Pale or Yellowish-Looking Skin
Changes in skin appearance can sometimes accompany vitamin B12 deficiency anemia.
Mayo Clinic notes that vitamin deficiency anemia may cause the skin to appear pale or yellowish.
These changes may occur when the body isn’t producing healthy red blood cells normally.
Skin color alone cannot diagnose a vitamin deficiency, however. Lighting, natural complexion, anemia from other causes, liver problems, and numerous other factors can affect appearance.
If a noticeable change in skin color occurs alongside fatigue, weakness, dizziness, or other symptoms, consider discussing it with your healthcare provider.
6. Shortness of Breath or Dizziness
Becoming unusually winded during activities that previously felt easy can be concerning.
When vitamin B12 deficiency contributes to anemia, the blood may become less effective at delivering oxygen throughout the body.
Possible symptoms can include shortness of breath, dizziness, and tiredness.
However, shortness of breath can also be associated with heart or lung problems and other potentially serious conditions.
Sudden or severe shortness of breath, particularly when accompanied by chest pain, fainting, or other concerning symptoms, requires prompt medical evaluation.
7. A Sore or Painful Tongue
Your mouth can occasionally provide clues about nutritional deficiencies.
Vitamin B12 deficiency may cause soreness of the mouth or tongue, according to the NIH.
Some people may notice that their tongue feels unusually tender or uncomfortable.
As with most symptoms on this list, a sore tongue has many possible causes, including irritation, infections, medications, dental problems, and other nutritional deficiencies.
Persistent changes should be evaluated rather than self-diagnosed.
8. Mood or Behavioral Changes
Vitamin B12 deficiency doesn’t only produce physical symptoms.
Because the vitamin contributes to normal brain and nervous-system function, low B12 levels may be associated with changes in mood or behavior.
Possible symptoms can include depression, confusion, or other changes in thinking and behavior.
Low B12 levels have also been associated with depression, although the relationship is complicated and depression can have many causes.
A B12 supplement should therefore not be viewed as a general treatment for depression or other mental health conditions.
Instead, unexplained mood or cognitive changes are another reason a healthcare provider may consider checking B12 levels.
9. Muscle Weakness
A gradual decline in strength can be easy to dismiss as part of getting older.
But persistent muscle weakness may sometimes occur with vitamin B12 deficiency.
Mayo Clinic lists muscle weakness among the symptoms that can occur when B12 levels become very low.
A person might notice everyday activities becoming harder, such as climbing stairs, carrying groceries, or getting up from a chair.
There are many other possible explanations for muscle weakness, however, including inactivity, medication side effects, neurological disorders, and other nutritional deficiencies.
Why Vitamin B12 Deficiency Becomes More Important After 50
Getting older doesn’t automatically mean you’ll become deficient in vitamin B12.
The bigger issue is absorption.
Normally, stomach acid helps separate vitamin B12 from the protein in food. The vitamin then combines with a substance called intrinsic factor so it can be absorbed.
As people age, some produce less stomach acid, which can make it harder to absorb naturally occurring B12 from food.
The NIH specifically recommends that people over 50 obtain recommended amounts of B12 from fortified foods or supplements because B12 from these sources may be easier for many older adults to absorb.
Who Is Most at Risk?
Age isn’t the only factor that can increase the likelihood of vitamin B12 deficiency.
People may face a higher risk if they:
- Eat little or no meat, fish, eggs, or dairy
- Follow a vegan or strict vegetarian diet
- Have pernicious anemia
- Have Crohn’s disease or celiac disease
- Have undergone certain stomach or intestinal surgeries
- Have conditions affecting nutrient absorption
- Take certain medications for extended periods
For example, long-term use of some acid-reducing medications can interfere with B12 absorption, and the diabetes medication metformin has also been associated with lower B12 levels.
If any of these risk factors apply to you, discussing B12 with your healthcare provider may be worthwhile.
Foods High in Vitamin B12
Vitamin B12 occurs naturally primarily in animal-derived foods.
Good dietary sources include:
- Fish
- Meat
- Poultry
- Eggs
- Milk and other dairy products
Some breakfast cereals and other foods are also fortified with vitamin B12.
People who eat little or no animal products generally need to rely more heavily on fortified foods or supplements to meet their B12 needs.
Should Adults Over 50 Take a Vitamin B12 Supplement?
There isn’t one answer that applies to everyone.
The recommended dietary allowance for most adults is 2.4 micrograms of vitamin B12 per day. Because absorption of naturally occurring B12 may decline with age, the NIH recommends that adults over 50 get recommended amounts from fortified foods and/or supplements.
However, taking increasingly large doses isn’t necessarily better.
B12 supplements are commonly sold at doses far above the daily requirement because the body absorbs only a portion of large oral doses. A healthcare professional can help determine whether supplementation is appropriate based on your diet, medications, medical history, and blood-test results.
It’s also important to remember that B12 isn’t a general-purpose energy booster. NIH guidance notes that taking extra vitamin B12 won’t increase energy in someone who already gets enough.
How Doctors Check for Vitamin B12 Deficiency
Symptoms alone aren’t enough to diagnose a B12 deficiency.
Healthcare providers can use blood testing to measure vitamin B12 and evaluate the number and appearance of red blood cells. Additional testing may sometimes be needed to identify the underlying reason for the deficiency.
This matters because treatment can depend on the cause.
Someone who isn’t consuming enough B12 may have different needs from someone whose digestive system cannot properly absorb it.
Treatment can include oral supplements, injections, or other forms of B12 depending on the individual’s situation.
Don’t Ignore Persistent Symptoms
Vitamin B12 deficiency can be easy to overlook because its symptoms often develop slowly.
Fatigue may be blamed on getting older. Tingling might be dismissed as poor circulation. Forgetfulness may be written off as another birthday passing.
But persistent symptoms deserve attention.
The NIH warns that vitamin B12 deficiency can damage the nervous system even without anemia, making timely diagnosis and treatment important.
Fortunately, a simple conversation with your healthcare provider and appropriate blood testing can help determine whether low B12 is actually responsible.
The Bottom Line
Vitamin B12 plays an essential role in red blood cell production and nervous-system health, and adults over 50 can have more difficulty absorbing the vitamin naturally present in food.
Nine potential warning signs include fatigue, tingling or numbness, balance problems, memory changes, pale or yellowish skin, dizziness or shortness of breath, a sore tongue, mood changes, and muscle weakness.
None of these symptoms proves you have a vitamin B12 deficiency. Many can be caused by other medical conditions, which is why testing is more reliable than trying to diagnose yourself based on symptoms.
If you’ve noticed several of these changes—particularly if they’re new, persistent, or getting worse—consider asking your healthcare provider whether checking your vitamin B12 level makes sense.
Medical Disclaimer: This article is provided for general educational and informational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional regarding symptoms, medical conditions, medications, supplements, or changes to your diet.
