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They also cost time and money, and in some cases expert groups have decided that routine screening does not clearly improve health for everyone
It is considered a controlled substance that can be addictive and carries the risk of withdrawal symptoms and potential side effects such as a racing or irregular heartbeat
The effects are also faster-acting and more predictable.
PMID 25945462
Understanding these factors is essential when considering the best method for ensuring adequate B12 levels in your body
Vitamin B12 mostly comes from animal food sources such as meat, eggs, fish and milk
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