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It doesn't block DHT, affect testosterone levels, or alter hormone balance
The safety comes from medical supervision: proper dosing, sterile technique, and professional monitoring
Choosing the right product: Opt for serums and creams with a GHK-Cu concentration of at least 1%
Neural circuit-specialized astrocytes: transcriptomic, proteomic, morphological, and functional evidence
Xu C, et al
Both are FDA-approved with decades of safety data, and a review summarized by the International Society for Sexual Medicine notes that PDE5 inhibitors remain the first-line pharmacological treatment for erectile dysfunction based on efficacy and safety evidence
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