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B vitamins play a role in many processes in the body, including metabolism and brain function, and they are a popular supplement
A 2025 meta-analysis of 16 studies involving 6,098 participants found no statistically significant difference between intramuscular, oral, and sublingual B12 supplementation routes
Concentration refers to the proportion of waste products to water
Flushing or a feeling of warmth
[3] Patients with deficiencies often experience fatigue, cognitive or nerve impairments, and slow recovery
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