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Deficiency of vitamin B12 may cause tiredness, weakness, constipation, loss of appetite, weight loss and megaloblastic anemia (a condition when red blood cells become larger in size than normal)
Nicotinic acid is then assimilated into Lactobacillus arabinosis during growth 97
For general context, see peer-reviewed articles in major journals (reading list below)
Difficulty concentrating, forgetfulness, or mental sluggishness
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