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Stress, fatigue and 'brain fog' as well as reduced physical stamina are common side effects of Vitamin B12 deficiency
The animal data backs this up in a striking way: a single dose lowered serotonin production in the brain, while long-term use raised it
Low levels have been linked with symptoms such as low mood, increased anxiety, irritability, and mood swings
This is an area of active research and one of the primary motivations behind longevity-focused microdosing protocols explored later in this guide
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