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For hair , it is a reasonable add-on but not a first-line treatment
Research-Use Quality Checks Before Comparing Compounds Compound choice is only one part of responsible research sourcing
Esposito S et al
This delivery method bypasses the gastrointestinal system altogether, so persons in risk groups for vitamin B12 deficiency with gastrointestinal issues may turn to the shot option for a quick means of ensuring their body has sufficient stores of vitamin B12 to effectively function
See the Science & Research tab below for the full reference list (16 peer-reviewed citations linked to PubMed)
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