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Your natural GHK-Cu levels decline roughly 60% by age 60

doi: 10.1016/j.bbi.2018.06.016 150 AndersonGBerkMDeanOMoylanSMaesM

While this calculator is strictly for research purposes, it does demonstrate how a published trial dose translates into measurable syringe units

The United Kingdom National Quality Assessment Scheme for Haematinic Assays warns against false B12 results and the risk of neurological damage: In the event of any discordance between clinical findings of B12 deficiency and a normal B12 laboratory result, then treatment should not be delayed

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This is especially true if you are currently taking medication for blood pressure or other cardiovascular concerns