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But, for fertility treatments, higher doses are needed

Why Deficiency Matters Even mild deficiency can cause wide-ranging symptoms: Persistent fatigue or low energy Brain fog, mood changes, or poor concentration Tingling or numbness in hands and feet Pale skin or shortness of breath Reduced immune function These occur because B12 is critical for oxygen transport and nerve conduction

[DOI] [PubMed] [Google Scholar] 24.Frmont L

Each type has its pros and cons

Handbook Exp Pharmacol 196: 369405, 2010 [DOI] [PMC free article] [PubMed] [Google Scholar] 3.McGill MR, Sharpe MR, Williams CD, Taha M, Curry SC, Jaeschke H: The mechanism underlying acetaminophen-induced hepatotoxicity in humans and mice involves mitochondrial damage and nuclear DNA fragmentation