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Fatigue is common and can be caused by many things, including: Iron deficiency Low vitamin D Thyroid issues Poor sleep quality or sleep apnoea Stress and burnout Low mood/anxiety Dietary patterns and hydration Long-term conditions Thats why we always recommend basing B12 treatment on clinical context, and ideally blood test results, rather than guessing
You have a family history of the illness (rare)
Whether you're newly diagnosed or managing long-term treatment, this guide provides evidence-based information aligned with NICE guidance and UK clinical practice
People with conditions that affect nutrient absorption, such as Crohns disease or celiac disease
Journal of Alternative and Complementary Medicine
Athletes subject to drug testing cannot use these products regardless of the format
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