Caffeine Content of Hair of the Dog

Unfortunately the manufacturers of Hair of the Dog are not willing to disclose the levels of caffeine in their product.
Hair of the Dog is marketed as a "detox" drink.
The name of the drink is reference to an old english hangover cure - whereby alcohol was used.
This drink, however, does not contain alcohol but a proprietary blend of ingredients.
There are also a number of sugar-free flavors.
Ingredients in Hair of the Dog
Pure Carbonated Water, High Fructose Corn Syrup, Citric Acid, L-Glutamine, Ascorbic Acid, Taurine, Potasium Hydrogen D-Glucarate, Schizandra Extract, Milk Thistle Extract, Ginseng Extract, Guarana Extract, Natural & Artificial Flavor, Sodium Benzoate (preserves freshness), Potassium Sorbate (preserves freshness), Caffeine, Inositol, Niacin, D-calcium pantothenate, Pyridoxine Hydrochloride (vitamin B-6), Blue 1, Caramel Color, Cyanocobalamin (vitamin B-12)
Proprietary Blend 4602mg (Potassium Hydrogen D-Glucarate, Taurine, Caffeine, Inositol, Schizandra Extract, L-Glutamine, Milk Thistle Extract, Ginseng Extract, Guarana Extract.)
Sources
From http://www.hairofdog.com/products-red.htm

