2.2. Test Sample
Formula beverage (MelaGene+™, Melaleuca, Shanghai, China) contained 11.3% (3400 mg; the deoxyribonucleic acid (DNA) content of roes is 31.06 mg/mL) salmon roe, 0.3% (90 mg) yeast, 0.18% (56 mg) snow fungus, citric acid, and water. Placebo beverage’s main ingredients were citric acid and water. Subjects consumed a bottle of drink (30 g) daily and underwent cognitive testing at weeks 0, 4, and 8.