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Vitamin B12 deficiency is a common condition that can occur in people of all age groups

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Some doctors may also recommend single-ingredient shots, such as vitamin B-12, but these are mainly intended for people who have a deficiency in that nutrient

Last reviewed: May 30, 2026 Last updated: May 30, 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