A Follow-up Trial of Proglucamune® in the Treatment of Protective Qi Deficiency, a TCM Condition

This is a follow-up Phase II study of a previously complete pilot trial (Protocol ID: 201875) with the same goal: evaluating the activity of Proglucamune on Protective Qi (PQi) Insufficiency. According to Traditional Chinese Medicine (TCM) principle, Protective Qi is a one specific concept of Qi that provides the vital energy of the body. It works primarily on the body surface as a defensive barrier. In this context, Protective Qi is analogous to anatomical barriers of the innate immune system located for example, at the skin surface and the mucosal surfaces of the respiratory and digestive tract. Individuals with PQi Insufficiency are predisposed to frequent cold and other symptoms caused by invasion of external pathogens ("Wai Xie" or "external evil" in TCM). ß-glucan is a polysaccharide that activates macrophage (Dectin-1) and neutrophil (CR3) receptors, and therefore enhances immune defense at digestive and respiratory mucosa. Clinical trials have shown its immune activity such as preventing upper respiratory tract infection (URTI) and Traveler's diarrhea. Notably, ß-glucan is a component of Ganoderma Lucidum (or Reishi / Lingzhi), one TCM ingredient well-known for improving Qi. Based on this connection, investigators hypothesized that ß-glucan is the active ingredient in Reishi that at least partially accounts for Reishi's activity on Qi. To test our hypothesis, investigators have conducted an uncontrolled pilot trial that investigated the effect of a commercially available, high ß-glucan containing product, Proglucamune®, on PQi status. Proglucamune contains ß-glucan from three different natural sources: Reishi mushroom, Shiitaki mushroom, and Bakers' yeast, each providing ß-glucan that differs slightly in their molecular structure. The data obtained demonstrated a statistically significant effect of Proglucamune on improving PQi in individuals with PQi Insufficiency. The current study is aimed to further determine this effect in a more stringent (placebo-c