PERBANDINGAN KADAR Vitamin – D DALAM SERUM PADA DEWASA DAN LANSIA SETELAH KONSUMSI SUPLEMEN Vitamin - D

This study aims to compare serum vitamin D levels in adults (ages 20–59) and elderly individuals (≥60 years) after a period of vitamin D supplementation. The study used a quasi-experimental design with measurements of serum 25- hydroxyvitamin D [25(OH)D] levels taken before and after the intervention. The results showed a significant increase in vitamin D levels in both groups following supplementation. However, the increase was generally slower in the elderly group compared to the adult group. This difference is likely due to age-related physiological changes that affect vitamin D metabolism.