For skin concerns, GHK-Cu may be included in topical products, serums used during or after microneedling, or as part of a broader protocol with other skin rejuvenation peptides or regenerative therapies
Joint stiffness can occur at higher doses
Generally, these variation peptides are found in parts per million in active technologies that topical products claim to include at high percentages but the final concentration of the variation peptides in topical products is generally less than 0.01% and these peptides would then have to be converted to even smaller amounts of pure copper peptides within the skin
If you notice a rash, itching, or any difficulty breathing, stop use immediately and seek medical attention
But people who have a restricted diet, avoid eating meat especially red meat, or are vegetarians can get L-carnitine deficiency
Unless you have a well-balanced diet rich in citrus fruits you may be at risk of not obtaining sufficient vitamin C