About to start my rat on androsterone.
Does androsterone possess immune boosting abilities too?
I am not aware of any direct studies on that. However, DHEA is known to potentiate the immune system in both animals and humans, and some studies show strong androgens like DHT have a dampening response on inappropriate/exaggerated immune response. With aging, there seems to be a decrease in normal immune function and increase in abnormal responses (e.g. autoimmune conditions). The study below shows that a combination of DHEA and DHT restore both aspects of the dysregulated immune function of old mice to the level of healthy young/adult mice.
Dihydrotestosterone exerts a depressive influence on the production of interleukin-4 (IL-4), IL-5, and gamma-interferon, but not IL-2 by activated ... - PubMed - NCBI
The study used an HED of 0.1 mg/kg DHEA and 0.01 mg/kg DHT to achieve this effect. Androsterone is a precursor to DHT and converts into DHT with efficiency of around 10%. So, an HED of 0.1mg (equal to the one of DHEA) should be able to replicate the design of the study. Interestingly, another study found that DHEA and androsterone used in equal doses had remarkable synergistic effect, and I doubt that it is a coincidence.
Remarkable Synergistic Effect Of Androsterone With DHEA