Welcome @cb3, The protocol of supplements I take for neuropathy has a 1200 mg daily dosage of Na-RALA (600 mg morning/evening) along with other supplements. My neuropathy is idiopathic and I only have some numbness and tingling. I'm wondering if you might find the following discussion helpful.

-- Looking for tips on managing Radiation-induced proctitis https://connect.mayoclinic.org/discussion/radiation-induced-proctitis/

The Foundation for Peripheral Neuropathy has a list of supplements folks have found helpful for neuropathy on their complementary and alternative treatments here - https://www.foundationforpn.org/wp-content/uploads/2020/08/Complementary-and-Alternative-Treatments-Revised-2020-final.-1.pdf