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The Food and Nutrition Board has established recommended dietary allowances and dietary reference intakes for vitamin B12
The points below summarize categories where caution is most consistently flagged in reviews and regulator notices
At very high concentrations, it may inhibit monoamine oxidase slightly, but this effect is not clinically relevant at typical doses
Sensory : pins and needles or numbness in feet and/or hands, or sometimes increased sensitivity to pain
[6] First-line pharmacological treatments include phosphodiesterase type 5 (PDE5) inhibitors, which are licensed, well-studied medications: Sildenafil (Viagra): Typically effective within 30-60 minutes, lasting 4-6 hours [7] Tadalafil (Cialis): Longer duration of action (up to 36 hours), also available as daily low-dose formulation [8] Vardenafil (Levitra): Similar efficacy to sildenafil with slightly different pharmacokinetics Avanafil (Spedra): Take approximately 30 minutes before sexual activity
The MHRA advises periodic monitoring of B12 levels in at-risk or symptomatic patients taking metformin
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