There is a lack of long-term data beyond 23 months, and large-scale, randomized controlled trials are limited, according to Anetta Reszko, MD, a board-certified dermatologist and dermatologic surgeon, a clinical assistant professor of dermatology at Weill Cornell Medical College
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)
GHK-Cu does it through fibroblast activation and repair-oriented ECM remodeling
While vitamin B12 injections can be an effective treatment for autism spectrum disorders, it is important to note that more research is needed to fully understand the mechanisms behind the positive effects of vitamin B12 on autism
For muscle, tendon, ligament, or nerve repair , injectable forms are significantly more effective due to bioavailability and delivery route
Lets take a few of these in more detail