b12 injections last for how long What Are the Benefits of Vitamin Injections? How Long Do Vitamin B12

When side effects do occur, they are typically mild and may include: Mild gastrointestinal symptoms such as nausea, diarrhoea, or upset stomach, particularly when starting supplementation or taking high doses on an empty stomach Skin reactions including itching, rash, or a sensation of swelling, though these are uncommon Headache or dizziness in some individuals, particularly with intramuscular injections Injection site reactions (pain, redness, or swelling) when B12 is administered via intramuscular injection for deficiency treatment It is important to note that serious adverse effects are rare

According to the NIH Office of Dietary Supplements, functional B12 deficiency is most commonly seen in patients with one or more of the following: Age over 50 stomach acid production declines with age, and stomach acid is required to free B12 from food PPI or H2 blocker use reflux medications suppress the acid needed for B12 absorption Metformin use, which interferes with B12 absorption directly Vegan or vegetarian diets B12 is found almost exclusively in animal products Gut conditions including celiac, IBS, SIBO, and Crohns MTHFR mutations that affect how B12 is metabolized once absorbed Heavy alcohol use The symptoms of low B12 are easy to dismiss: fatigue, brain fog, low mood, tingling in the hands or feet, weakness, and shortness of breath on mild exertion

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The NHS advises that taking up to 2 mg (2000 micrograms) per day of vitamin B12 in supplements is unlikely to cause harm