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There are many factors which can affect the way the human body absorbs nutrients, and B12 is no different
In general, vitamin C strengthens immunity, and vitamin A improves eyesight
Always seek professional guidance
However, doctors may recommend taking B12 supplements after the age of 50 years as your ability to absorb B12 decreases with age
Nerve problems, such as: numbness or tingling (like muscle weakness)
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