One ingredient found to be useful in the treatment of hyperpigmentation disorders is Rumex extract.

Rumex K-1, a new rich-protein green-leaf plant, can yield 5 times of protein per unit greater than soybean.

Rumex Kl was a perennial plant with persistent roots. It was introduced to China in 1995. Rumex Kl attracted people's attention with its biological characters beneficial to human and economical value.