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For those considering Cerebrolysin, key limitations include: no prevention trials have been conducted (all studies in existing disease), optimal dosing remains uncertain (higher doses may actually be less effective), batch-to-batch variability in peptide content, and the inconvenience of repeated IV infusion cycles

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10.3390/cells9061479 13 BaiJ.ZhangY.FanQ.XuJ.ShanH.GaoX.et al (2020)

PaLS study: tobacco, alcohol and drugs usage among polish university students in the context of stress caused by the COVID-19 pandemic
The clinical significance arises when B12 is elevated without a clear exogenous explanation

Yes, copper peptides are safe to use on active acne
