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The onset of B12 deficiency can be subtle, often starting with symptoms that mimic everyday stress or fatigue
In some people, particularly older adults or those with limited protein intake, both glycine and cysteine availability may constrain glutathione synthesis
GHK-Cu complex and neuroprotection. Molecular Neurobiology .
Regulatory uncertainty limits its medical positioning, currently placing it in the grey zone of experimental peptides These limitations make clinical endorsement premature, especially in regulated health systems or for medical-grade use
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