What is main ingredient? What percentage of serum?

Vitamin C for Skin  Ingredients: 20%

Sodium Hyaluronate, Hamamelis Virginiana (Witch Hazel) Extract, Aloe Leaf Extract, Rosa Canina Fruit Extract, Chamomilla Recutita (Matricaria) Leaf Extract

Hyaluronic Acid for Skin  Ingredients: 5%

Hamamelis Virginiana (Witch Hazel) Extract, Aloe Leaf Extract, Vitamin C, Hydrolyzed Wheat Protein, Geranium Essential Oil

Retinol for Skin Ingredients: 2.5%

Sodium Hyaluronate, Tocopherol (Vitamin E), Licorice Root Extract, Retinol (Vitamin A), Scutellaria Baicalensis Root Extract, Green Tea Extract