3 groups of mice were given lethal doses of acetaminophen. The 1st group was given nothing, and they all died. The 2nd group was given n-acetylcysteine (NAC). Half of the mice died and half of them lived. The 3rd group was given ribose-cysteine (Riboceine). All the mice recovered and lived.

Based on this study, Riboceine is 300% more effective than n-acetylcysteine (NAC) without the side effects associated with NAC such as rashes and nausea.
Go to full study: Ribose Cysteine Protects Against Acetaminophen-Induced Hepatic and Renal Toxicity