After reading
Hough's paper on HPN-07 a second time (in regards to the Hough Pill), I can not agree that it is regenerative and thus not significant for us chronic sufferers.
"Surprisingly, the observation that HPN-07 treatment initiated within four hours after noise exposure and continued for 2 days has long-lasting effects, some of which only become evident 21–180 days later, is not readily explained from our evaluations but could be interpreted to suggest that HPN-07 may have the capacity to initiate repair mechanisms or a regenerative response among one or more components of the cellular architecture of the cochlea."
After reading their data, I can not see how they are suggesting it is regenerative.
Figure 8 (page 16-17) shows data on day 3, 10, 21, 180d of 6 animals each and all of which shows significantly
less hair cell loss but more importantly the percentage hair cell loss was relatively the same on
ALL days from day 3 group to day 180 group. This indicates that hair cell loss was already prevented early on by using the treatment 4 hours after acoustic shock to the animals. However, to conclude hair cell regeneration, the graphs would need to show a higher percentage hair cell loss early on and a lower percentage of hair cell loss at a later date. The fact that percentage of hair cell loss did not change much for all days of 3, 10, 21, 180 do not reflect hair cell regeneration but rather hair cell lost prevention early on.
However, their research does show it is an effective preventative measure and that is great.