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Food and Drug Administration advised consumers not to purchase or use "Blue Steel" or "Hero" products marketed as dietary supplements throughout the United States because they are considered unapproved drugs and have not been proven to be safe or effective

[Confidence: Medium] Organ-Specific Targeting: By isolating the hippocampus, the researchers confirmed that GHK-Cu can cross the blood-brain barrier (or bypass it via olfactory tracts) to modulate neuroinflammation and synaptic plasticity, which are critical bottlenecks in age-related cognitive decline

Differences in daily intake and supplemental forms can also influence their clinical use

This isnt a DIY biohacking experiment its a therapy best handled with professional care and pharmacy-grade formulations

The clearest guidance comes from injection science more broadly

Cerovecki T, et al