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Description
A massive 2024/2025 observational study published in PNAS (MedRxiv preprint) analyzed data from over 3,925 patients suffering from Long COVID and ME/CFS

Still, side effects from B12 supplements are possible, especially at higher doses, and include: Headache Nausea Vomiting Fatigue Weakness Diarrhea Tingling in the hands and feet Nasal spray Vitamin B12 is also available in a nasal spray
Sharing vitamins: cobamides unveil microbial interactions

Regular monitoring and adherence to the prescribed course are essential for optimal results
