What are the best ways to treat kidney deficiency?

Kidney deficiency can be divided into kidney-yang deficiency and kidney-yin deficiency; patients with kidney-yang deficiency can use kidney-qi pills to relieve symptoms, and patients with kidney-yin deficiency can use Liuwei Dihuang pills to regulate. Usually, you can eat some foods with kidney-tonifying effect, but it is not suitable for tonic. It needs to be slowly conditioned step by step.