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While anyone can benefit from healthy B12 levels, certain groups are more likely to experience deficiencies and may see greater advantages from supplementation: Vegans and vegetarians: B12 is primarily found in animal products, making supplementation critical for those on plant-based diets

Age plays a modest role, with older adults sometimes experiencing slightly slower clearance, though age alone is not a strong determinant

Sleep improvements are typically the first thing patients at our Miami clinic report, often beginning within the first few nights of the cycle

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This is most relevant when vitamin B12 deficiency is being corrected and broader B-vitamin support is clinically appropriate, where symptoms include a combination of fatigue, neurological features, and stress, or where rapid repletion and functional support are desired