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Side effects and cautions B12 has no established upper limit due to low toxicity, but injections can have side effects: Common: soreness, redness or swelling at the injection site
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A study of 30 patients
What Are Vitamin B12 Injections
The mechanism involves an increase in GLUT4 transporter expression, improving glucose uptake
Absorption Can Be a Key Difference One reason injections may be chosen is concern about absorption
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