What is the best GHK-Cu concentration for different skin types and goals

Ingredients WATER, BUTYLENE GLYCOL, PROPANEDIOL, GLYCERIN, CAPRYLIC/CAPRIC TRIGLYCERIDE, NIACINAMIDE, VINYL DIMETHICONE, 1,2-HEXANEDIOL, SQUALANE, POLYGLYCERYL-10 LAURATE, SODIUM POLYACRYLOYLDIMETHYL TAURATE, CETEARYL OLIVATE, SORBITAN OLIVATE, ETHYLHEXYLGLYCERIN, DIMETHICONOL, CARBOMER, TROMETHAMINE, GLUTATHIONE, HYDROLYZED SPONGE, TOCOPHEROL, ASPARAGUS OFFICINALIS EXTRACT, XANTHAN GUM, ADENOSINE, CITRUS AURANTIUM DULCIS (ORANGE) FLOWER OIL, LITSEA CUBEBA FRUIT OIL, DISODIUM EDTA, CITRUS PARADISI (GRAPEFRUIT) PEEL OIL, CITRUS AURANTIUM BERGAMIA (BERGAMOT) FRUIT OIL, MENTHA VIRIDIS (SPEARMINT) LEAF OIL, BAROSMA BETULINA LEAF EXTRACT, SORBITOL, ASCORBIC ACID, HELIANTHUS ANNUUS (SUNFLOWER) SEED OIL, SUCROSE STEARATE, GLYCERYL STEARATE, BETA-CAROTENE, FERULIC ACID, (-)-ALPHA-BISABOLOL, BETA-GLUCAN, HESPERIDIN, ERGOTHIONEINE, LIMONENE, LINALOOL, CITRAL *** Ingredients are subject to change at the manufacturer's discretion

Improved heart health: Collagen promotes the development of blood vessels
Se utiliza en alopecia androgentica inicial, post-trasplante capilar y en estudios de alopecia areata
Looking purely at the numbers, about 1 billion people worldwide are deficient