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Last reviewed: May 29, 2026 Last updated: May 29, 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

Why B12 Matters Vitamin B12 (cobalamin) is essential for energy production, neurological function, red blood cell formation, and methylation the biochemical process that keeps thousands of pathways in your body working correctly

The ideal injection sites include the deltoid, the stomach, or the thigh

You've had bypass surgery for weight loss, which removes part of your stomach

What Does Vitamin B12 Do for You

The science looked promising and the safety profile seemed reasonable