All available studies show that topical products containing GHK-Cu are safe and cause no side effects when applied to the skin [3, 10, 19]
What This Means for You You may soon be able to get these peptides from a real pharmacy instead of a random website
However, because extreme fatigue is a symptom of many other conditions, your doctor will likely want to rule out other potential causes before considering a CFS/ME diagnosis
8 Oral medications Because GLP-1 medications slow stomach emptying, the absorption of other oral medications can be slightly delayed
FASEB Journal, 25(3), 907915
While the review is specific to these compounds, the outcome may also offer insight into how regulators approach similar peptides going forward