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Recently various biodegradable PEI-derivatives have been synthesized with better transfection properties and less toxicity than linear PEL Overall, the efficacy of PEI and probably of polycationic systems in general depends on the molecular weight, the overall cationic charge and the degree of branching

Peptides are chains of amino acids, and these chains occur naturally in the body, yet with the aging process, the body produces fewer peptides

GHK-Cu (Copper Peptide): The Most Researched Peptide for Hair Growth GHK-Cu is a tripeptide of glycine, histidine, and lysine bound to a copper ion

10.1073/pnas.0509040103 Proc