Weak back according to Chinese Medicine

The two Chinese Medicinal herbs most likely to help treat weak back

Why might Eucommia Leaf (Du Zhong Ye) help with weak back?

Because it is a herb specifically indicated to treat weak back as can be seen on Eucommia Leaf's page.

Eucommia Leaves is a Warm herb that tastes Pungent. It targets the Kidney and the Liver.

Its main actions are: Strengthens the Liver and the Kidneys

Read more about Eucommia Leaves here

Why might Mutton (Yang Rou) help with weak back?

Because it is a herb specifically indicated to treat weak back as can be seen on Mutton's page.

Muttons is a Warm herb that tastes Sweet. It targets the Spleen, the Stomach and the Kidney.

Its main actions are: Warms the Stomach and the Middle Burner. Tonifies Qi.

Read more about Muttons here