[9, 20, 24, 25, 19] discussed the rationale for participant selection and provided justification for their sample sizes
Saline is cheap enough
This advanced blend combines the bioactive tripeptide KPV with Palmitoylethanolamide (PEA), Hyaluronic Acid (HA), and Sodium Bicarbonate

Made in United States Beauty Concerns: Anti-Acne, Anti-Aging, Brightening, Exfoliating, Hydrating, Pore Reducing, Sensitive Skin, and Skin Firming Formulation Type: Serum Ingredient Preferences: Fragrance-Free, Hypoallergenic, Non-Comedogenic, Paraben-Free, Phthalate-Free, and Sulfate-Free Ingredients: Deionized water, Niacinamide, Aloe Barbadensis Leaf Juice, Chamomilla Recutita (Matricaria) Flower Extract, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Lactobacillus/Ganoderma Lucidum (Reishi Mushroom) Extract /Lentinus Edodes (Shitake Mushroom) Extract Ferment Filtrate, Glycerin, Royal Jelly, Copper Tripeptide-1, Lactococcus Ferment Lysate, Saccharomyces/Capsicum Annuum Fruit Ferment Filtrate, Lactobacillus Ferment Lysate, Hydrolyzed Ganoderma Lucidum (Mushroom) Extract, Sodium Hyaluronate, Beta-Glucan, Centella Asiatica Extract, Fructooligosaccharides, Beta Vulgaris (Beet) Root Extract, Acetyl Hexapeptide-8, Palmitoyl Tripeptide-5, Silver dihydrogen citrate, Citric acid