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B12 has also been loosely linked to serotonin production, the brain chemical that promotes good moods and wards off depression

Because of that, B12 is often called the energy vitamin

1 2 Neurochemical Mechanisms in Disease

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The absence of FDA approval means that use represents an off-label application requiring informed consent and medical judgment

[1] [6] Always source medications from registered UK pharmacies (you can check registration via the General Pharmaceutical Council) and avoid unregulated online suppliers, as counterfeit or substandard products pose significant health risks