To prevent zinc overload, cytosolic levels are tightly regulated by ZnT1, which serves as the principal efflux pump that exports excess zinc to the extracellular milieu 31
Faster plasma peak doesn't mean faster cosmetic results

Shampoo: Orgainc Aloe Barbadensis Leaf Juice, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Cocoyl Isethionate, Glycerin, Caffeine, MSM, Biotin, Pantothenic Acid, PEPTASTEM [Citrus Aurantium Dulcis (Orange) Callus Culture Extract, Centella Asiatica (Gotu Kola) Extract, Tripeptide-5, Palmitoyl Tetrapeptide-7, Acetyl Hexapeptide-8, sh-Oligopeptide1, Allantoin] , Hydrolyzed Keratin, Vitis Vinifera Fruit Cell Extract (Grape Stem Cell), L-Methionine, Myristoyl Pentapeptide-17, Fucus Vesiculosus (Seaweed) Extract, Clitoria ternatea Linn Extract, Niacin, Simmondsia Chinensis (Jojoba) Seed Oil, Brassicamidopropyl Dimethylamine, Arthrospira Platensis, Peppermint (Mentha) Oil, Lavender (Lavendula) Oil, Sage (Salvia officinalis L.) Oil, Bergamot (Citrus Bergamia) Oil, Tocopheryl (Vitamin E), Ethoxydiglycol, Caprylyl Glycol, Xanthan Gum, Guar Hydroxypropyltrimonium Chloride, Sodium Benzoate, Potassium Sorbate, GHK-Cu (Copper Peptide), Radish ferment, Sodium Chloride, Tetrasodium Glutamate Diacetate

International 104, 3448
no serious adverse effects in that group
The Plant Journal