A Vitamin B12 injection delivers vitamin B12 directly into the muscle, bypassing the digestive system. Vitamin B12 is required for normal red blood cell production and healthy neurological function. In the UK, hydroxocobalamin is commonly used for treating Vitamin B12 deficiency because it remains in the body longer than cyanocobalamin.

Vitamin B12 deficiency can cause a range of symptoms including persistent tiredness, weakness, lack of energy, problems with concentration or memory, pins and needles, numbness and a sore or inflamed tongue. Some neurological symptoms can become serious if a deficiency remains untreated, so persistent symptoms should be properly investigated rather than assuming they are simply caused by tiredness.

A blood test can help identify Vitamin B12 deficiency. Your results should be considered alongside your symptoms, medical history and the possible underlying cause. East Park Healthcare can arrange private blood testing if you have symptoms or concerns about your Vitamin B12 levels.

There are several possible causes. These include insufficient Vitamin B12 in the diet, autoimmune gastritis (historically associated with pernicious anaemia), conditions affecting absorption such as coeliac disease, previous stomach or intestinal surgery, and certain medications. Long-term metformin use can also contribute to Vitamin B12 deficiency in some people.

Not necessarily. The appropriate treatment depends on why you are deficient. Oral Vitamin B12 can be appropriate for some dietary deficiencies, whereas intramuscular injections may be preferred or required where B12 cannot be adequately absorbed. NICE recommends lifelong intramuscular B12 replacement for certain irreversible causes, including autoimmune gastritis and after some types of gastrointestinal surgery.

Hydroxocobalamin starts working straight away, but that does not mean symptoms disappear immediately. If your symptoms are caused by Vitamin B12 deficiency, it can take several days or weeks before you begin to notice an improvement. The response varies depending on the severity and cause of the deficiency.

The frequency depends on the reason for treatment and whether neurological symptoms are present. Some patients initially require a course of more frequent injections, followed by maintenance treatment. People with certain irreversible causes of B12 deficiency may require lifelong intramuscular replacement. Your treatment schedule should therefore be based on your individual clinical circumstances rather than a standard injection frequency for everyone.

Vitamin B12 injections are generally well tolerated when appropriately prescribed and administered. Possible side effects include discomfort, swelling or itching around the injection site, nausea and diarrhoea. Your suitability should be assessed before treatment, particularly if you have relevant medical conditions or have previously reacted to Vitamin B12 preparations.

Yes. Vitamin B12 occurs naturally mainly in animal-derived foods such as meat, fish, eggs and dairy products. People following vegan or some vegetarian diets may therefore be at greater risk of inadequate dietary B12 unless they consume fortified foods or appropriate supplements.

East Park Healthcare provides private Vitamin B12 assessment, blood testing and injections from our medical clinic at First Floor, 67 East Park Road, Blackburn, BB1 8DW. If you are experiencing symptoms that could indicate Vitamin B12 deficiency, we can arrange appropriate testing and discuss whether Vitamin B12 replacement is suitable.

Yes. Recreational use of nitrous oxide, sometimes known as “balloons”, “NOS” or laughing gas, can interfere with the body's ability to use Vitamin B12 by inactivating it. Frequent or heavy use can lead to a functional Vitamin B12 deficiency and potentially serious neurological problems, including pins and needles, numbness, weakness, poor balance and difficulty walking.

Importantly, a standard Vitamin B12 blood test may sometimes appear within the normal range in people affected by nitrous oxide because the problem can be with B12 function rather than simply the measured amount in the blood. Further investigation may therefore be required when nitrous oxide use and neurological symptoms are suspected.

Anyone experiencing neurological symptoms following nitrous oxide use should seek medical assessment rather than simply treating themselves with Vitamin B12 injections. Continuing recreational nitrous oxide use can worsen the problem.