It's skim cow's milk, milk sugar, veg oils, cow's milk protein, vitamins and minerals, amino acids, and various salts.
Here is Similac DHA advanced:
Nonfat Milk, Lactose, High Oleic Safflower Oil, Soy Oil, Coconut Oil, Whey Protein Concentrate, Less than 2% of: C. Cohnii Oil, M. Alpina Oil, Potassium Citrate, Calcium Carbonate, Ascorbic Acid, Potassium Chloride, Choline Bitartrate, Magnesium Chloride, Choline Chloride, Ferrous Sulfate, Ascorbyl Palmitate, Taurine, M-Inositol, Alpha Tocopheryl Acetate, L-Carnitine, Mixed Tocopherols, Sodium Chloride, Zinc Sulfate, Niacinamide, Calcium Pantothenate, Cupric Sulfate, Vitamin A Palmitate, Thiamine Chloride Hydrochloride, Riboflavin, Pyridoxine Hydrochloride, Beta-Carotene, Folic Acid, Manganese Sulfate, Phylloquinone, Biotin, Sodium Selenate, Vitamin D3, Cyanocobalamin and Nucleotides (Adenosine5 -Monophosphate, Cytidine 5-Monophosphate, Disodium Guanosine 5-Monophosphate, Disodium Uridine 5-Monophosphate)