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Combining them is theoretically fine but likely redundant for most people
The human tri-peptide GHK and tissue remodeling. Journal of Biomaterials Science, Polymer Edition , 19(8), 969988
B12 helps metabolise the amino acids needed to produce keratin and other structural proteins, supporting the creation of strong, healthy hair strands
These results are from short-duration rodent studies and do not indicate that comparable outcomes occur in humans
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Is it still safe to use
