how much b12 should a human take via injection Benefits of Injections for Optimal Health Vitamin B12 Injections: 8 Dosage
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Mild side effects like temporary swelling at the injection site can occur

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2019;43:e13038

Other meta-analyses 107 , 111 , 112 and RCTs 106 , 108 did not indicate significant results in relieving pain, fatigue, or neurologic symptoms by supplementation with these vitamin B 12 forms

Livdans-Forret AB, Harvey PJ, Larkin-Thier SM

[7] Do not apply an ice pack to the injection site without covering the skin with a towel or thick cloth first