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Possible symptoms may include: Fatigue Weakness Pale skin Irritability Difficulty concentrating Shortness of breath Numbness or tingling Mood changes Because the symptoms overlap significantly, blood testing is usually necessary to distinguish between the two deficiencies

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So, is that the end of the story

Available in two formulas: a Sensitive Skin Niacinamide Base for a calmer, gentler feel, and a Normal Skin Hyaluronic Acid Base for lightweight hydration and a smooth, dewy finish

More specialised tests such as active B12 (holotranscobalamin) or methylmalonic acid may be available through specialist referral, though availability varies across the UK

However, more research is needed to establish causal relationships and understand the clinical significance of these observations