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GHK-Cu concentrations in human plasma drop from approximately 200 nanograms per milliliter in young adults to roughly 80 nanograms per milliliter by age 60

You can read more in the linked article

Larger sample sizes are needed to validate these findings in future studies

Shipping to United States Free Standard Shipping with any US$ 35 purchase (10 - 14 business days) Returns and Exchanges Features Package quantity: 6g x 15 sticks Benefits: Main ingredients: How to use: Major Ingredients Dried Yeast, Low Molecular Fish Collagen, Anhydrous Crystalline Glucose, Isomalt, Rice Protein Powder, Black Bean Powder, Nutty Grain Flavoring Powder(Dextrin, Nutty Grain Flavoring, Gum Arabic), Silicon Dioxide, Vitamin C, Vitamin E Concoction(DL-Alpha Tocopheryl Acetate, Modified Starch, Glucose Syrup Powder, Silicon Dioxide), Glucosyl Stevia, Hyaluronic Acid Mixed Preparation(Dextrin, Hyaluronic Acid), Biotin Concoction(Biotin, Dibasic Calcium Phosphate), Elastin Hydrolyzed Powder, White Tomato Concentrated Extract Powder, Sucralose *Contains Fish, Soybean Ingredients subject to change at manufacturer's discretion