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Many people report feeling more energetic within a few days, while others notice gradual improvement over one to two weeks
The type of B12 supplement might matter too
Lifelong injections may be required
A deficiency can lead to symptoms like lethargy and weakness, making it harder to tackle daily tasks
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Administered via the nasal route, this spray provides a fast-acting response by directly affecting the brain receptors involved in mood and pain regulation
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