does b12 have to be injected into muscle Vitamin Injection Dosage Best Vitamin B12 Injection Sites:

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Well-tolerated in preclinical models at effective dosages

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While feeling tired after a B12 injection may be disheartening, its important to communicate any concerns with your healthcare provider to determine the root cause and find the best solution for your body

Gastrointestinal malabsorption: Patients with Crohns disease, celiac disease, gastric bypass or intestinal surgery often cant absorb B12 properly