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These should only be performed by a trained professional
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In general, its a good idea to speak with a healthcare professional before you take any new supplement
doi:10.1126/science.1215691 67
With oral supplements, your digestive system must break down and absorb the nutrients before your body can use them
The average diet supplies about 5 to 15 mcg/day of vitamin B 12in a protein-bound form that is available for absorption after normal digestion
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