Neurotrophic Factors are what researchers are looking at to regrow the auditory nerve synapses so that they reconnect with the appropriate hair cell that it has lost connection to. Neurotrophic Factors are defined as, "a family of proteins that are responsible for the growth and survival of developing neurons and the maintenance of mature neurons". There are different sorts of NF's. One type is Brain Derived Neurotrophic Factor. You can unlock this brain growth hormone by what's called exercising. We also can raise our BDNF level a bit by getting some sun. Other types of NF's are NT-3 which is defined by, "a neurotrophic factor which stimulates nerve growth in different populations of neurons outside of the population that is being affected by NGF." There are quite a few other ones like bFGF, IGF, CNTF, and NT-4/NT-5.
I've been using a few supplements that contain NF's like Astaxanthin, Lions Mane, Curcumin (turmeric), and Ashwagandha. I started using Astaxanthin after reading about a man on here experimenting with the antioxidant supplement. I wanted to see what would happen with it's NT-3 properties. It didn't produce any effects on my hearing although it did give me a good bit of energy months ago when I first started it. I've continued using the supplement plus Lions Mane and Ashwagandha. I also put turmeric in my smoothie every morning. Although I'm happy to have a bit of my ability to remember information left, the cognition I had before my hearing changed was absolutely nothing compared to what it is now. I can definitely say the supplements I'm using now help me with my memory a good bit since all have been clinically studied to aid with those who have problems with cognitive diseases like Dementia or Alzheimers.