The Reishi mushroom is commonly called the "mushroom of immortality"; it is widely believed to act as a prebiotic, and support a healthy immune system.
 
Daily Serving suggestion based on weight of pet.
<10lbs: 1/8tsp
10-20lbs: 1/4tsp
21-30lbs: 3/8tsp
31-40lbs: 1/2tsp
41-50lbs: 5/8tsp
51-60lbs: 3/4tsp
61-70lbs: 7/8tsp
71-80lbs: 1tsp
>80lbs: 9/8tsp
 
Use intermittently or for supplementation only.