Active cancer, pregnancy, bleeding disorders, and uncontrolled diabetes change the answer
This is particularly beneficial if an injury in one area (like the knee) has caused compensatory tension in another (like the hip)
Type I collagen is synthesized and secreted by dermal fibroblasts and represents 8090% of skin collagen
Prog Neuro-Psychopharmacol Biol Psychiatry 79:340368 Adams J, Howsmon DP, Kruger U, Geis E, Gehn E, Fimbres V, Pollard E, Mitchell J et al (2017) Significant association of urinary toxic metals and autism-related symptomsa nonlinear statistical analysis with cross validation
As someone focused on *organizing* the overabundance of health advice, I find that osteoporosis and osteopenia are prime topics for this, because so much can be done to improve bones, starting with things people can do on their own