Centrum Liquid does contain phosphate. It also has zinc that I might not want to be dosing. Different places give slightly different ingredient lists for it, but this is from the Centrum site:
http://www.centrum.com/product_detai...M&panel=liquid
INGREDIENTS:
Purified Water, Sucrose, Ethyl Alcohol, Glycerin, Polysorbate 80, Ascorbic Acid (Vit. C), Ferrous Gluconate, Natural and Artificial Flavors, Citric Acid, dl-Alpha Tocopheryl Acetate (Vit. E), Niacinamide, Zinc Gluconate, Sodium Benzoate (preservative), Dexpanthenol, PEG Ether of Castor Oil, Manganese Chloride, Pyridoxine Hydrochloride (Vit. B6), Thiamine Hydrochloride (Vit. B1), BHA, Riboflavin (Vit. B2), Vitamin A Palmitate, Starch, Edetic Acid (preservative), Biotin, Potassium Iodide, Chromium Chloride, Sodium Citrate,
Dibasic Sodium Phosphate , Disodium Molybdate, Cyanocobalamin (Vit. B12), BHT (preservative), Cholecalciferol (Vit. D), Silicon Dioxide, Sorbic Acid