It appears on the FDAs approved Bulk Drug Substances List as Category 1
The blue color is from the copper ion, which may remain in the solution even after the GHK peptide chain has broken down
Zhou X, Xia X, Li L, Ye YMYZJ, Chen Q, Ke M, Cui Q, He Y, Chen Y-T, Lin S-S, Liu W, Wang J (2025) Evaluation of heavy metals and essential minerals in the hair of children with autism spectrum disorder and their association with symptom severity
Indeed, GLP-1R is widely expressed on a variety of immune cells, such as macrophages, lymphocytes and invariant natural killer T cells ( i NKT) [77], suggesting direct immunological properties of GLP-1R signaling
Muddapu VR, Mandali A, Chakravarthy VS, Ramaswamy S (2019) A computational model of loss of dopaminergic cells in parkinsons disease due to glutamate-induced excitotoxicity
Dosage & Administration Take as directed by a healthcare professional Usually one softgel daily after meals Swallow whole with water Do not exceed recommended dosage Side Effects Mild gastric discomfort Nausea (rare) Headache (rare) Allergic reaction in sensitive individuals Precautions Consult doctor before use in pregnancy or lactation Use cautiously in patients with bleeding disorders Avoid if allergic to any ingredient Not intended as a substitute for a balanced diet Storage Store in a cool, dry place away from direct sunlight