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Symptoms include persistent fatigue and low energy, brain fog and poor concentration, low mood, anxiety or depression, memory problems, tingling or numbness in hands and feet, poor sleep quality, weakened immune function and hair thinning and loss
It does not require injection if oral bioavailability is adequate
Heidi Spratt for advice regarding the statistical analyses
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Mood and Cognitive Changes: B12 is linked to mental health, and deficiency can cause mood swings, memory problems, and even depression
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