If your liver is weak, think twice before doing a liver cleanse, it's traumatic for the liver. It made me extremely sick, and I am not the only one here.
Besides, the benefits are not that clear, people report sometimes a temporary improvement of their allergies, but it does not last, so they do another one and they end up doing dozens of Liver Cleanses for a marginal result.
milk thistle is easier on the body, and seems more efficient.