Evidence Level
Strong
Panax ginseng has one of the largest bodies of clinical research among adaptogens, with over 500 published human studies. Geng et al. (2010) conducted a systematic review of 9 RCTs and found consistent cognitive benefits. Seida et al. (2011) reviewed 65 studies on immune function and found moderate evidence for cold/flu prevention. For erectile dysfunction, Jang et al. (2008) published a meta-analysis of 7 RCTs showing significant improvement. The Korean red ginseng form (steamed) has a modified ginsenoside profile with enhanced bioactive compounds (Rg3, compound K) and is generally considered more potent.