Vitamin B12 Injections

A single booster shot can be enough for a quick energy lift, but courses of 4 or 6 injections are available for sustained benefit, particularly for confirmed deficiency.

Many patients report a noticeable improvement in energy levels, mental clarity and overall wellbeing within around 24 hours of their injection.

An intramuscular injection bypasses the digestive system entirely, delivering the vitamin directly into the bloodstream. This makes it far more bioavailable than oral tablets, especially for those with absorption issues.

About a week. Effects vary between individuals, but B12 is the one water-soluble vitamin your body is able to store, so any excess is kept for later use rather than being lost straight away.

The injection is quick, taking just a few minutes, with only brief, mild discomfort at the injection site.

Vitamin B12 injections are very well tolerated. Mild redness or tenderness at the injection site is the most commonly reported effect; occasionally patients notice mild diarrhoea, itching or a feeling of swelling, which settles quickly.

This depends on your individual needs — for a diagnosed deficiency, a typical protocol starts with more frequent injections before tapering to a monthly maintenance shot. Others prefer single top-up shots periodically for an energy boost. Dr Sofia will advise a schedule suited to you.

B12 injections are sometimes included in weight-loss programmes, as they can boost energy and support metabolism — but they aren't a standalone weight-loss solution. They work best alongside a healthy diet and regular exercise.

Low B12 reduces your body's ability to produce healthy red blood cells, which carry oxygen around the body — leaving you feeling tired, weak and low on energy.

Vegans, vegetarians, older adults, and anyone experiencing fatigue, brain fog or low mood who may benefit from a rapid, highly bioavailable B12 boost.