Should you take collagen with vitamin C?

The body needs vitamin C to make collagen: one step of collagen building depends on it, and a lack of vitamin C causes scurvy, with weak connective tissue.^[1] In one small trial, 8 men took gelatin with vitamin C 1 hour before exercise, and 15 g doubled a blood marker of new collagen.^[2] Every gelatin dose in that trial contained vitamin C, so the trial cannot show what vitamin C added.^[2]