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ghk-cu side effects long term PSA: Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r/30PlusSkinCare Frontiers | Exploring the beneficial
Description
Possible reasons include: Dehydration Fluid loss can trigger headaches

Polarity of the blood-brain barrier: distribution of enzymes between the luminal and antiluminal membranes of brain capillary endothelial cells

10.1016/s0009-9120(99)00022-3 [DOI] [PubMed] [Google Scholar] Sever A
Dosage: The dosage of Vitamin B12 Injection will vary depending on the patient's medical history, age, and severity of the deficiency

If they refuse to share this information, or other important safety details, it could be a red flag
