Once again I will spout off about LED light therapy. LED is cheaper than laser and has thousands of study on LIGHT.
Efficacy of low level laser therapy on neurosensory recovery after injury to the inferior alveolar nerve
Comparative effects of wavelengths of low-power laser in regeneration of sciatic nerve in rats following crushing lesion.
Comparative effects of wavelengths of low-power laser in regeneration of sciatic nerve in rats following crushing lesion. - PubMed - NCBI
I can't find all the more relevant studies now, but you can buy an LED light that will work good for $150, or better yet, if you can afford LASER treatment or if you have insurance that will cover laser go for that.
Laser can penetrate deeper than LED (all things equal).
The most important part of Light therapy is calculating the correct dose, which has to do with depth of injury and skin tone/color.
Role of Low-Level Laser Therapy in Neurorehabilitation
SPINAL CORD INJURY
SCI is a severe central nervous system trauma with no effective restorative therapies. Light therapy has biomodulatory effects on central and peripheral nervous tissue. Several groups investigated the effectiveness of LLLT on SCI. Roch-kind et al [80] demonstrated that LLLT applied simultaneously to the injured sciatic nerve and the corresponding segment of the spinal cord accelerates the process of regeneration of the injured peripheral nerve.
Light therapy (810 nm, 150 mW) significantly increased the axonal number and distance of regrowth in 2 SCI models: a contusion model and a dorsal hemisection model [81,82]. In addition, LLLT returned aspects of function to baseline levels and significantly suppressed immune cell activation and cytokine-chemokine expression [81].
Moreover, light therapy significantly improved the average length of axonal regrowth and increased the total axon number for both injury models. A statistically significant lower angle of rotation of the feet was observed during a walking test in the hemisection model and a statistically significant overall functional recovery in contusion model was seen in the LLLT groups. These results suggest that light may be a promising therapy for human SCI [82]."
Role of Low-Level Laser Therapy in Neurorehabilitation
What a lot of studies look at is improved healing after acute injury. But with disc issues we are looking at how to heal the nerves after chronic injury/insult.
The main idea is that after acute injury to the nervous system there is a unique environment for healing created and that the chance for healing only lasts a short time. This healing environment would include things like nerve growth factor, vascular endothelial growth factor (VEGF), and other more complicated stuff that is beyond me. But in chronic injuries it makes since that we want to re-create the best we can this environment for healing.
There are many supplements to bump up nGF vEGF.
and also Notch inhibitors may help spur healing.
Notch Signaling Inhibits Axon Regeneration
Notch Signaling Inhibits Axon Regeneration
I've read
Curcmin
sulforaphane
and genistein
IMO combining notch inhibitors and growth factors plus laser could be a good treatment.
If you can, go with laser treatments to start. If you want to do DIY with lED let me know.