Based on customer results since the GHK-Cu Hair Serum hit the market, the answer appears to be two
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The severity of the deficiency decides how much and how often you get shots
these were not completed in peer-reviewed form, and a Phase I safety study has been mentioned in the literature but its results were never published

Risk Factors for Adverse Reactions Some individuals may be at higher risk for side effects, and therefore, we recommend that you speak to a medical professional if you have any of the following: Pre-existing liver or kidney conditions Autoimmune disorders Hormone-sensitive conditions History of allergic reactions to peptides Long-Term Safety Considerations Its important to note several key facts about long-term safety: No human clinical trials have assessed long-term safety beyond several months Carcinogenicity (cancer-causing potential) has not been thoroughly studied The potential for developing antibodies against BPC 157 with prolonged use is unknown Possible tolerance development with continuous use has not been well-researched Long-term effects on hormone systems remain unclear Extent of Research on BPC 157 As it stands, BPC 157 still has some research gaps