What keeps me up at night…. Collagen, vitamin C and coffee (translate this article to real use for me)

This is largely a timing question but how long after a morning cuppa does caffeine inhibit collagen synthesis?

a lot of collagen articles on triathlete, runner, etc cite a single study (2014 study here) saying “if you want collagen to maximize recovery and have steel ton joints, stop drinking that damn coffee”. Loosely paraphrased.

From the study, what does 1mm, 3mm and 5mm caffeine look like in terms of the human body? Is it really even that significant? Add a grapefruit to my breakfast and all is well in the world?

I put my collagen into my coffee…

Not only coffee / caffeine but sugar will have the same effect on collagen replacement.
Time to get rid of those sports drinks?