Combined creatine and β-hydroxy-β-methylbutyrate supplementation with integral conditioning exercise enhances functional performance and metabolic health in physically active older adults: A randomized controlled crossover trial. - Ramos-Hernández R; Busto N; Miguel-Ortega Á; Martínez-Ferrán M; Santamaría-Peláez M; Saiz-Rodríguez M; Mielgo-Ayuso J (Aging clinical and experimental research, 2026)