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The Bottom Line Theres a clear association between lower B12 levels and a higher body-weight
The hair evidence is interesting, but earlier than the marketing suggests
L., Marks-Nelson, E
A landmark 2024 study published in the Proceedings of the National Academy of Sciences (PNAS) revealed that severe oxidative stress is a shared, defining characteristic of both ME/CFS and Long COVID
Nature Reviews Drug Discovery 24 , 85 (2025) doi: Competing Interests The authors of this article are employees of The Boston Consulting Group (BCG), a management consultancy that works with the world's leading biopharmaceutical companies
