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Vitamin B12 deficiency: Struggling to stay awake could be a symptom of this condition | Express.co.uk
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7 Signs You Have A Vitamin D Deficiency | What's Good by V | Vitamin d benefits, Health facts, Vitamin d deficiency
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Vitamin B12 deficiency is a common health problem that can have serious consequences – but doctors often overlook it
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Sleep Better With Vitamins: 4 Nutritional Deficiencies That Could Cause Chronic Insomnia | Nutrition & Dieting articles | Well Being center | SteadyHealth.com
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Do you feel fatigued or sleepy all the time? Rule out vitamin deficiency, check out these factors | Health Tips and News
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