Just.a message of hope for those in the early stages of recovery - with a decent diet, all the best supplements, restful sleep, restoration does occur.
Whilst my time was 5 minutes slower than a PB from 5 years ago the exciting thing was I found it all very easy and little strain to generate the muscle glycogen to get around.
If you had asked me to do this even a month ago there was little chance.
I will shout this from the roof tops my sense is at the moment (and my views may change over time ) but the number 1 supplement that has made all the difference is chelated zinc - compared to kelp, vitamin d, iron , b vits , fish oil , giving up gluten, giving up dairy, dietary changes.
In recommendations on these threads zinc gets a much smaller mention than some of the other supplements - I may be wrong but throw in my 2 pennies worth if it is of interest : )