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Evidence Supporting Vitamin B12 Injections Clinical research underscores the benefits of vitamin B12 supplementation for mood and mental clarity: Mood Enhancement: Studies have demonstrated that vitamin B12 injections can significantly alleviate symptoms of depression and anxiety, offering mood improvements and reducing fatigue, particularly in patients with major depression

Oral capsules or tablets are generally more stable and easier to store, typically requiring only a cool, dry place away from direct light

Technically, yes for a short period

Some peptides are FDA-approved drugs

Summary: B12 shots at home are NHS-supported intramuscular or subcutaneous injections of hydroxocobalamin used to treat confirmed vitamin B12 deficiency following proper training from healthcare professionals

doi: 10.3390/ijms23115938