NewslettersMuscle Cell News Vitamin A-Retinoic Acid Contributes to Muscle Stem Cell andMitochondrial Function Loss in Old Age By Jamie Kang - March 31, 2025 0 21 Investigators showed that Vitamin A, a micronutrient derived from diet and metabolized into retinoic acid, acted as an antioxidant and transcriptional regulator in muscle stem cells. [JCI Insight] AbstractGraphical Abstract