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A 2025 meta-analysis of 16 studies involving 6,098 participants found no statistically significant difference between intramuscular, oral, and sublingual B12 supplementation routes

However, scientific research shows that very high-dose oral B12 (1,000-2,000 mcg) can be effective for some, as about 1% can be absorbed without intrinsic factor

2 Ultimately, current evidence supports a common-sense approach: when maintained within a healthy range, vitamin B12 plays an essential role in supporting overall health and well-being

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Nocturnal hypoxemia severity ands renin-angiotensin system activity in obstructive sleep apnea