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Description
Doses and ingredients could be different to whats on the label, and it could be contaminated

52 ZhangZ.LiuY.HuangQ.SuY.ZhangY.WangG.et al (2014)

So, if your vitamin B12 is not working properly because your folate metabolism isnt working properly this causes homocysteine imbalances which are considered a serious health problem for anyone especially for those with MTHFR gene mutations. 4 Reactions to Methylfolate supplementation Individuals that cannot tolerate Methylfolate often have low B12 levels in their cells

thus, thorough preclinical validation is essential
Handling and Stability Risks Improper handling exposure to light, heat, repeated freeze-thaw cycles, or strongly alkaline conditions can degrade the peptide or disrupt copper coordination, producing experimental variability that is sometimes mistaken for biological inconsistency

Zhao et al., 2018
