Intragastric royal jelly and pRJ (0.7 and 1.4 mg/kg body weight/d/90 d)  D-galactose induced mouse model of aging  EG1 and EG2: mice on 0.7 and 1.4 mg RJ, respectivelyEG3 and EG4: mice on 0.7 and 1.4 mg RJ hydrolysate, respectivelyCG: untreated mice  Antioxidant enzymes, body weight, muscular performance, memory, and learning.  Both doses of pRJ prevented age-related locomotor decline, preserved body weight, enhanced memory and learning, increased antioxidant enzyme activity, and inhibited the production of lipid peroxides.  [95]