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Signs of deficiency include: Fatigue and low energy Memory issues and brain fog Numbness or tingling in the hands and feet Mood swings or depression Pale skin and shortness of breath Supplementing Safely: Dosage and Absorption Tips While B12 is generally safe as its water-soluble (meaning excess is excreted), certain considerations can help you get the most out of your supplement: Sublingual Supplements : These are absorbed directly into the bloodstream, bypassing the digestive system, making them ideal for those with absorption issues
That means at each shot should be at least 5,000mcg of methylcobalamin NOT cyanocobalamin
It has more damage to address, and healing takes longer
The 2026 review is blunt that diet is secondary, noting these measures are substantially less effective if dose titration is not actively and thoughtfully managed
Daily Goal : Aim for 23L of fluids (more if exercising or in heat)
Common experiences after the first injection include: Mild soreness or redness at the injection site (usually resolves within 12 days) Slight improvement in energy levels or mood No immediate noticeable change (particularly common if deficiency is severe) Rarely, mild side effects such as headache or dizziness Some patients report their urine becoming brighter or more intensely coloured following injection, which occurs because excess B12 is excreted renally
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