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Note: Oral use only
One study found that copper peptide treatment increased the elongation of human hair follicles ex vivo
"No reported side effects in limited research" is not the same as "safe." Anecdotal reports from the research community sometimes mention transient effects such as injection-site irritation, mild nausea, fatigue, or lightheadedness, but these are not from controlled trials and cannot be reliably attributed to the peptide
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