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More specialised tests such as active B12 (holotranscobalamin) or methylmalonic acid may be available through specialist referral, though availability varies across the UK
The clinical reality is much narrower than the marketing
Injections are best for: Severe deficiencies, pernicious anemia, significant malabsorption issues, and when rapid symptom relief is needed
This article explains what to avoid, why these simple rules matter, and how to feel comfortable again quickly
This happens due to an existing medical condition or poor diet
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