Vitamin B12 is one of the nutrients your body simply cannot function without. It helps produce healthy red blood cells, supports your nervous system, contributes to DNA production, and plays an essential role in turning the food you eat into energy.
Many people get enough B12 through their diet, but others—especially older adults, vegetarians, vegans, or people with certain digestive conditions—may gradually become deficient without realizing it.
If you begin taking vitamin B12 because you truly need it, here’s what you may notice over time.
Why vitamin B12 becomes more important with age
As we grow older, the stomach often produces less acid, making it harder to absorb vitamin B12 from food.
Certain medications, including some acid-reducing drugs and metformin, may also reduce absorption.
Because the body’s stores can last for years, deficiency often develops slowly and quietly.
You may notice more energy
One of the earliest improvements many people report after correcting a B12 deficiency is feeling less tired.
That’s because vitamin B12 helps your body produce healthy red blood cells, which carry oxygen throughout the body.
If fatigue was caused by a B12 deficiency, restoring healthy levels may gradually improve energy.
However, taking extra B12 won’t boost energy if your levels are already normal.
Your brain and nerves benefit
Vitamin B12 helps maintain the protective covering around nerves, known as myelin.
When levels become too low, some people experience:
- Tingling in the hands or feet
- Numbness
- Poor balance
- Difficulty concentrating
- Memory problems
Correcting a deficiency may help improve these symptoms, particularly when treated early.
It supports healthy blood cells
Vitamin B12 works closely with folate to produce normal red blood cells.
Without enough B12, the body may produce unusually large red blood cells that don’t function efficiently, leading to a type of anemia.
Healthy B12 levels help support normal oxygen delivery throughout the body.
Foods naturally rich in vitamin B12
Excellent food sources include:
- Fish
- Salmon
- Tuna
- Eggs
- Milk
- Yogurt
- Cheese
- Lean beef
- Chicken
- Fortified breakfast cereals
People following vegetarian or vegan diets often rely on fortified foods or supplements to meet their needs.
A B12-friendly breakfast
Ingredients
- 2 boiled eggs
- Plain Greek yogurt
- Whole-grain toast
- Fresh berries
- Glass of milk or fortified plant-based milk
This meal provides protein along with several natural or fortified sources of vitamin B12.
Can you take too much?
Vitamin B12 is generally considered very safe because excess amounts are usually excreted in the urine.
Still, supplements are most useful when they address a genuine deficiency or increased need.
If you suspect you may be low in vitamin B12, it’s worth discussing testing with your healthcare professional before starting long-term supplementation.
Who may benefit from testing?
You may wish to ask your healthcare provider about your B12 status if you:
- Are over 60
- Follow a vegan or vegetarian diet
- Take metformin
- Regularly use acid-reducing medications
- Have digestive conditions that affect nutrient absorption
- Experience unexplained fatigue, numbness, or tingling
The bottom line
Vitamin B12 is essential for healthy nerves, blood cells, brain function, and energy production. If you have a deficiency, correcting it can make a meaningful difference to how you feel over time.
The greatest benefits come from meeting your body’s needs—not from taking more than you require. Combined with a balanced diet and healthy lifestyle, maintaining adequate vitamin B12 is one simple way to support long-term health and vitality.
For more simple habits that can boost your well-being, check out how to Apply Castor Oil for 7 Days and You May Be Surprised by the Results or discover Just Three Simple Daily Habits That Can Help You Feel More Energetic After 70. And if you’re curious about other health-boosting foods, make sure you’re Eating Raw Garlic? Don’t Make These Common Mistakes.
