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Every timeline beyond 12 weeks, every injectable dosing recommendation, and every stacking protocol is an extrapolation rather than a validated finding
Evidence reviews for risk factors and symptoms and signs for vitamin B12 deficiency: Vitamin B12 deficiency in over 16s: diagnosis and management: Evidence review B
Roux-en-Y gastric bypass surgery (RYGB) but not sleeve gastric bypass surgery or gastric banding, increases the risk of vitamin B 12 deficiency and requires preventive post-operative treatment with either injected or high-dose oral supplementation
Side effects are rare and usually mild
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