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Post-treatment serum B12 measurements can be misleadingly high and may not accurately reflect tissue levels, so your GP will focus on symptom improvement and clinical assessment
Couturier, J., Przybyla-Toscano, J., Roret, T., Didierjean, C

All in all, Aquaxyl is a goodie and if you have dehydrated, dry skin it's something to look at
10.3390/jcm8040551 95 PasternakG

However, evidence supporting the long-term effects of intranasal GHK-Cu on cognitive performance of 5xFAD mice is limited (Sosna et al., 2018
GHK-Cu stimulates osteoblast attachment and collagen synthesis
