One cup (240-250 mL) of milk provides approximately 1.2 to 1.3 micrograms (mcg) of vitamin B12, which is about half of the recommended daily value for an adult.
Two large eggs provide a significant portion of your daily Vitamin B12, roughly 1.4 to 2.7 micrograms, depending on size, with almost all of it found in the yolk, contributing around 15-46% of the Daily Value (DV) for adults, making eggs a good source of this essential nutrient for red blood cell formation and nerve function, though absorption from eggs might be lower than meat, notes Healthline, EggInfo, and Australian Eggs.
A Norwegian study showed that plasma concentrations of vitamin B12 increase with the amounts of vitamin B12 provided by dairy products or fish but not with those provided by eggs or meat (Vogiatzoglou et al., 2009).
One cup of whole milk contains approximately 1.32µg of vitamin B12. Cheddar cheese. 100g of cheddar cheese contains approximately 1.06µg of vitamin B12. Mozzarella cheese.
Organ meats and shellfish are the richest dietary sources, with a 3-ounce (85 g) serving of cooked clams providing approximately 84.1 µg, while beef liver contains about 70.7 µg. Fatty fish, such as trout and salmon, supply 5.4 µg and 4.8 µg per 3-ounce serving, respectively.
Once treatment begins, recovery typically follows this timeline: First Few Days to Weeks: Many people notice an increase in energy and improvement in symptoms like fatigue and weakness within the first week of treatment. 1 to 3 Months: Neurological symptoms, such as tingling or memory issues, often start to improve.
To quickly increase B12, focus on animal products (meat, fish, dairy, eggs) and fortified foods (cereals, plant milks, nutritional yeast), but for a significant deficiency or rapid boost, especially if dietary changes aren't enough, consult a doctor for high-dose supplements or B12 injections, as severe cases require medical intervention for proper absorption and treatment, note NHS and Healthline.
Vitamin B-12 absorptions were 55% (95% CI 41–67%) from water, 65% (95% CI 51–79%) from milk and 55% (95% CI 41–69%) from fortified bread, values that did not differ.
If your deficit is mild, you may respond quickly to medication and eating more foods containing B12. If you have chronic low B12 levels or have underlying health conditions that cause the deficiency, you may need to take B12 for the rest of your life (or for as long as you have the underlying condition).
B12 deficiency can trigger specific food cravings, most notably for meat, fish, or eggs, as the body seeks animal-based sources to replenish the vitamin, especially in those on vegetarian/vegan diets or older adults. While cravings for sugary or salty foods can also signal general B-vitamin issues, the distinct urge for protein-rich animal products is a key indicator, but professional testing is crucial for confirmation.
Adults (aged 19 to 64) need about 1.5 micrograms a day of vitamin B12. If you eat meat, fish or dairy foods, you should be able to get enough vitamin B12 from your diet. But as vitamin B12 is not found naturally in foods such as fruit, vegetables and grains, vegans may not get enough of it.
2. Dairy Milk. In addition to B12, milk is an excellent source of calcium and is rich in protein, both of which are needed for bone and muscle health. Best for: People who consume animal products, tolerate dairy well, and are looking for a high-protein drink.
It takes just a single glass of milk to achieve 25% of the daily recommendation for calcium and 15% of the recommendation for vitamin D. No matter your age, drinking milk regularly can help maintain muscle and preserve bone strength to lower your risk for fractures and osteoporosis.
Check with your doctor for advice on how much vitamin B12 you should get from this source. Dairy: Cows pass the nutrient into their milk, though not at the same levels as is found in red meat. You can meet your daily needs with two cups of low-fat milk, 16 ounces of low-fat yogurt or 3 ounces of Swiss cheese.
The foods highest in Vitamin B12 are animal products, with clams and liver (beef, lamb) being exceptionally rich sources, often providing several hundred percent of the daily value in a single serving, alongside seafood like mussels, sardines, and salmon, dairy, eggs, and fortified cereals and nutritional yeast for vegans.
Conditions affecting the stomach
Some stomach conditions or stomach operations can prevent the absorption of enough vitamin B12. For example, a gastrectomy, a surgical procedure where part of your stomach is removed, increases your risk of developing a vitamin B12 deficiency.
Symptoms of vitamin B12 or folate deficiency anaemia
Vitamin B12 is present in foods of animal origin, including fish, meat, poultry, eggs, and dairy products [5,12]. Plant foods do not naturally contain vitamin B12. However, fortified breakfast cereals and fortified nutritional yeasts are readily available sources of vitamin B12 that have high bioavailability [13,14].
To fix a B12 deficiency fast, especially severe cases, you'll likely need B12 injections (hydroxocobalamin or cyanocobalamin) given frequently at first (e.g., every other day for 2 weeks) to quickly replenish levels, followed by oral supplements or less frequent injections depending on the cause. For milder deficiencies or prevention, increase B12-rich foods (meat, fish, dairy, eggs, fortified cereals) and consider high-dose oral supplements, but always see a doctor for diagnosis and a personalized, fast-acting plan, especially if you have neurological symptoms.
Vitamin B12 deficiency can also cause symptoms that affect your brain and nervous system (neurological symptoms), including: numbness. muscle weakness. psychological problems, which can range from mild depression or anxiety, to confusion and dementia.
Some people report feeling a boost in energy within just a few hours. Those with a severe B12 deficiency may notice the biggest and most immediate improvement in fatigue, brain fog, and mood. Others may experience a gradual increase in alertness and vitality over the next day.
In conclusion, our results show that lower vitamin B12 was associated with insomnia symptoms and sleepiness in specific groups of participants. However, further research with objective measurements of sleep is crucial to assess the relationship between sleep and vitamin B12.