Good point @Lokzo kidney Yin to me is related to cortisol so it should definitely help, Rehmannia is somenthing I’m planning to try soon as I’ve focus all my life on increase Yang because of low libido low energy but overtime Yang can deplete Yin and without Yin no Yang can be madeSorry to change the topic, but I've been using Rehmannia Glutinosa lately with very good success (libido, energy, mood). Do we know if it increases, decreases or modulates cortisol? It is one of the premier TCM herbs for restoring Kidney Yin Jing deficiency and associated Adrenal Fatigue syndrome.