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Injectable GHK-Cu bypasses this barrier entirely, delivering the compound directly into circulation for systemic distribution

doi: 10.1186/s12943-019-0976-4 16 ChenDZhangXLiZZhuB

This is vital for healthy-looking hair, nails and most importantly, the skin

At-risk groups should undergo regular blood tests to ensure their B12 levels remain within a healthy range

Daily dosing typically ranges between 200 g and 1,000 g, adjusted for body weight and condition severity

You can also supplement with NR (Nicotinamide Riboside), which is a precursor to NAD that has been tested in clinical trials and found to boost NAD levels