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These are: RRR RRS RSS RSR SRR SSR SSS SRS The two forms of alpha-tocopherol are designated (these are placed before alpha-tocopherol to indicate whether it is natural or synthetic) as listed below: Natural New designation: RRR-alpha-tocopherol (because all 3 positions are RRR) Old designation: d-alpha-tocopherol Synthetic New designation: all-rac-alpha-tocopherol (because it is a racemic mixture) Old designation: dl-alpha-tocopherol The old d and dl designations were describing the chemical structure that are sometimes still used

Structural & Functional Notes GHK-Cu is a naturally occurring tripeptide complex capable of binding copper ions within biological signaling environments

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The compound's exceptional selectivity for NNMT, combined with its favorable safety profile and membrane permeability characteristics, positions it as an invaluable resource for researchers investigating fundamental questions in metabolism, aging, and cellular energetics