The health-promoting potential of a balanced gut microbiota status modulated by calorie restriction (CR) posits a possible close link between gut microbiota (GM) and healthy aging. Short chain fatty acids (SCFAs) generated from intestinal bacterial fermentation may act as mediators between the microbiota and the immune system. In this review, a putative prophylactic role of butyric acid from endophytic bacteria fermentation of Aloe vera gel was described to suggest that the consumption of fermented extract of Aloe vera gel may be beneficial for health and QOL as an immune modulator.