TRT (real) is extremely safe for those in shape, and those who monitor.
40 mg is a joke of a dose, wonder why he bothers at all? Tiny test boost I guess...
I guess he knows and likes his range, the 5-factor comes into play. 5x40 - 200 nanograms a deciliter.
If he sits at around 300 natty, then the 200 boost, still very much in mid--range and very safe...