This vitamin is also necessary for producing the chemical serotonin, which works as a mood regulator, so having an increased or healthy amount of vitamin B12 will also boost mood
If your particular GP is unhelpful, could there be another in the practice who you could see instead
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Second, larger vials (10-20 mg) generally get the same 2 mL to keep concentration high enough that GLP-1 weekly doses don't require uncomfortably large injection volumes