All of our mushroom extract servings start at 1000 mg (approx 1/2 tsp or 2 capsules) for overall health and immune support. You could consider starting there to see how you respond, then consider higher doses depending on professional advice from your health care provider.
Keep in mind that the potential health benefits tend to show themselves with sustained, continued use over the course of time. There are also some people who notice positive effects by cycling in and out of different mushroom extracts throughout the seasons.
Another popular option is combining various functional mushrooms together. It really depends on what your health goals/needs are. Keep in mind that we are all different and respond in different ways to functional mushroom supplement use.
We always recommend finding what works best for you.
As we are not medical professionals, we do encourage seeking guidance from a medical professional just in case.