I wish there was study based on whether multi-vitamins help for those of us who are professional sitters (eg, in tech, so we sit on our ass all day), and who most of the time do NOT eat healthy diets, and do not get enough exercise.
In those circumstances, does a multi-vitamin a day improve things?
It's one thing to "support" it, it's another to make components actually available to make repairs. I remember some people testing out a direct screen swap between two identical iphones, only to find out they didn't work after the swap. So even if you can get a replacement component, do you have the management software to update the eeprom to say "hey, the screen with this serial is good to go".
It's a good read, just know what you are in for.