There is a second pathway that breaks down levodopa, via the enzyme catechol-O-methyltransferase (COMT)
In fact, a 2008 study found that after taking a 1,000 mcg oral supplement, only approximately 1.3% (or 13 mcg) of B12 was absorbed into the bloodstream
A: This varies depending on your individual needs and goals
Before making a final choice, consult a healthcare provider
In these cases, B12 injections can bypass the digestive system and deliver the vitamin directly into the bloodstream
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