Associated Press commissioned the Linus Pauling Institute to measure the in vitro antioxidant strength of Xango Juice against retail fruit juices. The antioxidant strength of XanGo Juice measured slightly higher than cranberry juice but lower than black cherry and less than half the value for blueberry juice. However, the value of in vitro analysis of antioxidant strength is questionable, as there is no current evidence that antioxidant phytochemicals present in Xango or other fruit juices actually have functions inside the human body. The measurements of antioxidant strength apply to test tubes, but consumed juices are affected by stomach acids that would neutralize or destroy antioxidant value preventing the same biological effects in vivo.