The present invention is generally directed to chemically synthesized peptides that are charged with zinc ions (herein “zinc-charged peptides”). The chemically synthesized peptides are based on the amino acid sequence of alpha-lactalbumin. The present invention is further directed to a method of preparing these two zinc-charged peptides by charging the chemically synthesized peptides with zinc ions. It is observed that charging these peptides with zinc ions activate the peptide's ability to induce apoptosis in cancer cell lines, as well as increase ATP, reduce Tau protein and inhibit P38 in the brain. The zinc-charged peptides are thus capable of treating cancer and diseases involving tauopathy such as Alzheimer's Disease. The present invention is thus further directed to a method of treating cancer and diseases involving tauopathy such as Alzheimer's Disease using the zinc-charged peptides.