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Why B12 Shots are Better than Oral Supplements Jul 2, 2025 5 min read Vitamin B12 is essential for many vital bodily functions including red blood cell production, nerve health, and DNA synthesis

Low levels may worsen liver stress and cell death

(Qiu et al., 2023) reported low levels of NAD + in the aorta from hypertensive patients showing that supplementation with NAD + precursors effectively lowered blood pressure and improved impaired vascular function in both hypertensive patients and mice

However, oral products lose potency while being digested and may not be truly effective at raising glutathione levels