Not just eventually, but fairly rapidly.
I've never used it nor worked with anyone using it. Others who have used it have suggested using a single injection only. Unfortunately I'm unable to comment beyond what they said themselves, other than that the single injection idea seems unlikely to harm and certainly stranger things have happened than something like this working, and there are positive reports.
Based on dose/response being such that even 5 days of use at 15 mcg/day has a net suppressive effect, I'd tend to expect that the single injection may not need to be past even 15 mcg. However the reported experiments were at higher doses than that.