Natural is a scam. Pee and poo are natural would you want to consume those?
Herbal supplements are completely unregulated. Remember that even FDA approved products are not exactly safe but they are studied to the point where their effects, risks and benefits are mostly (but not completely) known. "Natural" stuff is a total loose cannon in that it could be anything. Best case scenario it's harmless but overpriced grass clippings and often that's all your getting.
There is no liver cleanse save taking good care of it as in avoiding drugs or alcohol and not overdoing it on pain meds like tylenol and keeping normal weight. If anything other than obesity and excess alcohol, one of the top causes of liver damage IS natural/herbal products usually containing weight loss, energy, focus or testosterone enhancing products that do work but in more ways than intended.