For depression, some studies suggest high oral doses (1000-2000 mcg daily) or even lower doses (100 mcg) of B12 may help, often alongside folic acid, especially if deficient, but you must consult a doctor first, as dosages vary and high amounts can interact with medications, and deficiency needs testing to confirm, Mayo Clinic. A doctor can check your levels and recommend the right dosage, potentially suggesting injections if absorption is poor, but supplements are best used alongside standard depression treatments.
If your vitamin B12 levels are low, your healthcare provider may recommend an over-the-counter (OTC) supplement or prescription form of vitamin B12. A common dose of OTC vitamin B12 is 1,000 mcg each day. The risk of vitamin B12 side effects is low — even if you take too much.
The recommended daily amount of vitamin B-12 for adults is 2.4 micrograms (mcg). Older adults may need to eat more vitamin B-12. The ability to absorb vitamin B-12 lowers as a person gets older. Older adults may need to eat 10 to 12 mcg of vitamin B-12 to get enough of this vitamin.
Vitamins B9 and B12 are both thought to treat symptoms of anxiety. Folic acid has many uses in the body, and a vitamin B9 deficiency has been linked to higher levels of anxiety and depression. When taken in conjunction with B12, these B super-vitamins help metabolize serotonin, which is important for mood regulation.
The RDA for females who are pregnant is 2.6 mcg of vitamin B12 a day. Most people get enough vitamin B12 from their diet.
In fact, some studies have even suggested the opposite. For instance, one study noted that individuals who regularly took vitamin B12 supplements gained between 2.5 to 17 fewer pounds (1.2 to 7.7 kg) over a decade than those who didn't supplement.
Vitamin B12 deficiency symptoms develop gradually and include extreme fatigue, pale skin, shortness of breath, headaches, and nerve issues like numbness or tingling in hands/feet, plus cognitive problems such as memory loss and confusion, often linked to anemia but also affecting nerves and brain function, requiring medical diagnosis and treatment.
When will I feel better? Hydroxocobalamin starts to work straight away. However, it may take a few days or weeks before your vitamin B12 levels and symptoms (such as extreme tiredness or lack of energy) start to improve.
According to the study's findings, the B12 group experienced a minor improvement in anxiety and depression when compared to the placebo group. Above all, Vitamin B6 produced a statistically significant difference.
5 Symptoms That Indicate High Vitamin B12 Levels
People may experience frequent episodes of dizziness with no apparent cause. Headaches may be persistent and more intense than common tension headaches.
Taking vitamin B12 daily is generally safe for most people, as it's water-soluble and excess is flushed out, but high doses can cause mild side effects like headaches, nausea, dizziness, or diarrhea in some individuals, while very high levels (especially from injections) might rarely link to other issues, so it's best to stick to recommended amounts unless treating a diagnosed deficiency.
A: 2.4mcg is only approximately 1/250th of 1000mcg.
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.
The Food and Nutrition Board at the National Academies of Sciences, Engineering, and Medicine has established Recommended Dietary Allowances and Adequate Intakes for vitamin B12. These values range from 2.4 to 2.8 mcg for adults and from 0.4 to 2.8 mcg for infants, children, and adolescents, depending on age.
While research shows that high vitamin B12 levels don't directly damage healthy kidneys, elevated B12 often serves as an indicator of underlying kidney dysfunction.
Morning is the best time to take vitamin B12, ideally on an empty stomach. Here's why: B12 helps convert food into cellular energy (via methylation and ATP production), so taking it earlier supports your body's natural circadian rhythm. Taking it late in the day may increase alertness or interfere with sleep.
Very high daily doses of vitamin B12, ranging between 1000 and 2000 mcg, may effectively restore B12 levels within the body and positively impact depression symptoms. Even doses as low as 100 mcg are potent enough to positively impact cognition in adults with depressive symptoms.
Vitamin B-12 and other B vitamins play a role in making brain chemicals that affect mood and other brain functions. Low levels of B-12 and other B vitamins and folate may be linked to depression. Low levels of a vitamin, also called a vitamin deficiency, can happen if you're not eating a balanced diet.
Magnesium supplementation provides quick results. Case studies of magnesium supplementation reported improvements in depression, anxiety, and sleep within 1 week.
B12 is a key nutrient for nervous system health. It is important for producing serotonin and dopamine, which are mood-enhancing neurotransmitters. As a result, vitamin B12 can help to prevent and treat depression and anxiety. It can improve focus and memory as well.
The effects of B12 shots can be felt within 24 to 72 hours, depending on the individual's current B12 levels and overall health. People who are deficient in B12 often notice an immediate boost in energy, mental clarity, and mood after their first injection.
If you stop taking prescribed cyanocobalamin tablets, your vitamin B12 levels may start to go down. If your levels get too low, you may start to get symptoms such as tiredness again. This may take days, weeks or months to happen because it depends on: what your vitamin B12 levels are.
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.
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.
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.