Collagen can be rebuilt or protected: Nutritional and lifestyle support, including vitamin C (necessary for collagen synthesis), proline, glycine, zinc, and copper (cofactors), collagen peptides (supplements), antioxidants (prevent collagen degradation), and sunscreen (prevents UV-induced collagen breakdown)
He explains why cardiorespiratory fitness is one of the strongest modifiable predictors of longevity, clarifies what zone 2 training actually represents and how it differs from higher-intensity work, and addresses persistent confusion around exercise volume, intensity, and time constraints
Autophagy 9 , 239240 (2013)
Vitamin B12 deficiency is relatively rare, but it is more common in people who follow a vegetarian or vegan diet, as it is found almost exclusively in animal-derived foods