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Lack of robust human clinical trials prevents confirmation of consistent outcomes, optimal dosing, or long-term safety
Lancet (1999) 354(9180):7401.10.1016/S0140-6736(99)02479-4 13 NyholmETurpinPSwainDCunninghamBDalySNightingalePet alOral vitamin B12 can change our practice
While stress and lifestyle can play a role, ongoing fatigue is often linked to vitamin B12 deficiency , a condition that affects many adults in the UK
More serious side effects are rare but can occur
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