Three recent systematic reviews and a meta-analysis all concluded that short-term supplementation with folic acid, with or without other B vitamins, does not improve age-related cognitive decline or overall cognition and that trials of longer duration are needed (21, 156-158)
Mood-related symptoms of B12 deficiency include persistent irritability, low mood or emotional flatness that doesn't respond to typical coping strategies, restlessness, difficulty concentrating, and a general sense of being "off" that's hard to articulate
Lets take a few of these in more detail
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GHK-Cu does it through fibroblast activation and repair-oriented ECM remodeling
For the reader who needs guaranteed results on a fixed timeline, or who is not comfortable with the uncertainty that honest research-stage supplementation involves, this is probably not the right purchase right now - and that is an equally useful conclusion to reach from reading a guide like this