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Wellness 20 July 2025 7 min read Needle Size for a B12 Injection: A Simple Guide By Alaiyka Parvez Owner, CoLaz Aesthetics Clinic The short version For an intramuscular B12 injection, the usual choice is a 22 to 25 gauge needle, 1 to 1.5 inches long, given at 90 degrees into the deltoid
Why this is important: Reduced blood flow to the feet If a Vitamin B12 deficiency is causing a reduction or interrupted blood supply to the feet, you may experience very cold feet without reprieve, changes in skin colour (feet may appear white or purple), development of chilblains, muscle cramping and numbness
Health Conditions Certain health conditions, such as digestive disorders (like Crohn's disease or celiac disease), can impair the absorption of B12
If you fall into any of these categories, it's worth discussing B12 testing with your healthcare provider
Why Injections May Be Preferred Over Oral Supplements For those lacking vitamin B12, injections are often the best choice
Their work, published in peer-reviewed journals, demonstrated that blocking this enzyme could produce significant changes in body composition without affecting food intake
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