General Antioxidant Maintenance If you are simply looking to support your body's daily defenses and navigate the normal signs of ageing, 1500 mg might be higher than necessary
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If you are experiencing significant or worsening hair loss, patchy hair loss, scalp pain, redness, scaling, or symptoms such as fatigue, dizziness, cold intolerance, or unusual bleeding, seek medical care promptly
[PMID: 32167524 DOI: 10.1001/jamainternmed.2020.0994] [DOI] [PMC free article] [PubMed] [Google Scholar] 33.Huang C, Wang Y, Li X, Ren L, Zhao J, Hu Y, Zhang L, Fan G, Xu J, Gu X, Cheng Z, Yu T, Xia J, Wei Y, Wu W, Xie X, Yin W, Li H, Liu M, Xiao Y, Gao H, Guo L, Xie J, Wang G, Jiang R, Gao Z, Jin Q, Wang J, Cao B
A 2025 case-control study from Vietnam found what researchers described as a U-shaped relationship between B12 intake and cancer risk, with both lower and higher intakes associated with increased risk
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