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GHK-Cu is found naturally in human plasma, saliva, and urine, and its concentration in plasma declines significantly with age, from approximately 200 ng/ml at age 20 to around 80 ng/ml by age 60
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In rheumatoid arthritis (RA), however, that orchestra becomes disorganised
When to Be Concerned In a research context, further evaluation may be warranted if observations include: Rapidly expanding redness beyond the injection site Severe or escalating pain Persistent swelling lasting multiple days Signs of infection (increasing warmth, spreading redness, discharge) Systemic symptoms such as generalized hives, shortness of breath, dizziness, or facial swelling Severe or systemic reactions should be treated as medically significant and require appropriate clinical evaluation