feel sick after b12 injection Shots at Home: How, Where & How Often to Inject Yourself How Long Does a B12

Technically yes, but practically it creates a contradiction

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B12 Shots Are Safe, but Keep an Eye Out for These Mild Side Effects Knowledge is always power

However, some patients receiving high-dose B12 supplementation or injections may experience adverse reactions, though these relate to the treatment rather than the elevated levels: Possible reactions to B12 supplementation (particularly injections): Skin reactions, including acneiform eruptions or rashes Pruritus (itching) Injection site reactions (with parenteral administration) Rare hypersensitivity reactions Non-specific symptoms such as headaches, dizziness, or gastrointestinal disturbances have been reported by some patients taking B12 supplements, but causality is not well established in clinical evidence

Support during intravenous nutrition: may be administered when patients require intravenous nutrition or are at risk of vitamin deficiency during nutritional support