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It is important for patients and practitioners to understand that 'investigational' or 'research' status does not equate to safety, efficacy, or regulatory approval for human use outside of controlled clinical trial settings
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
It could point to several things: A different cause: your fatigue might stem from thyroid problems, iron deficiency, or sleep apnea rather than B12
Their work, published in peer-reviewed journals, demonstrated that blocking this enzyme could produce significant changes in body composition without affecting food intake
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
Vitamin B12 also has no established tolerable upper intake level due to its low toxicity, and excess amounts are generally excreted without adverse effects
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