The peptide fragments are all below 10 kilodaltons in size, which allows them to cross the blood-brain barrier, a feat that most neurotrophic factors cannot accomplish on their own
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In biotin deficiency, metabolic disturbances and immune dysfunction can occur (62)
Most observations suggestive of barrier loss were made in vitro , and although a paracellular route is possible and likely to occur, the internalization of meningococci in endothelial cells has been clearly demonstrated (Eugene et al., 2002
In fibroblast models, researchers observed that GHK-Cu is associated with increased collagen type I and III synthesis, fibronectin production, and glycosaminoglycan deposition
Some ophthalmic trials extended treatment to 12 weeks at 4mg daily without safety issues