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Last reviewed: June 9, 2026 Last updated: June 9, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

Funding: This study has been granted funding from the Centre of Excellence Scheme and the University of Bergen (UiB), Norway to the Centre for Intervention Science in Maternal and Child Health (CISMAC
Key benefits of taking vitamin d and b12 together include: 1

This is why an oral B12 supplement might do nothing for your fatigue, but a B12 injection makes you feel different by that afternoon