TCTP-PTD and its variants TCTP-PTD 13, 13M2, as well as penetratin and its analogs shuffle (R,K fix) 2 and PenetraMax were tested for the systemic delivery of intranasal insulin
Copper Peptide Results: Realistic Week-by-Week Based on the clinical data and consistent patterns across published studies, here is what topical GHK-Cu results actually look like: Week 1 to 2: Barrier improvement, reduced dryness and tightness

Common indications include: Pernicious anaemia an autoimmune condition where the stomach cannot produce intrinsic factor, a protein necessary for B12 absorption [8] [9] Malabsorption disorders including Crohn's disease, coeliac disease, or following gastric surgery Strict vegan or vegetarian diets with confirmed deficiency though high-dose oral B12 may be sufficient if no malabsorption exists Certain medications such as metformin or proton pump inhibitors that may interfere with B12 absorption [9] [10] Neurological symptoms including peripheral neuropathy, memory problems, or balance difficulties related to deficiency Diagnosis should be confirmed through blood tests measuring serum B12 levels, full blood count, folate, and often anti-intrinsic factor antibodies
There is no robust evidence for its safety or effectiveness in humans