I am 69 and have mild polyneuropathy (mainly loss of feeling in arms and legs) from IgA kappa light chain MGUS (8 years) and/or celiac disease. My MGUS is asymptomatic so I just use my hands and feet to keep the nerves engaged (woodturning and other hobbies). I use bioavailable curcumin (otherwise curcumin in turmeric is poorly absorbed); I don't know yet if that will impact my kappa numbers. Here is one link for foot bathing/massage and neuropathy; because it relates to chemo damage it may not apply to us as much: https://pubmed.ncbi.nlm.nih.gov/25275582/ . There are a lot of ads for TENS ems stimulation of nerves, but good to check with doctor or PT on that. ResearchGate has some pubs on massagers being good for peripheral neuropathy: https://www.researchgate.net/publication/339846541_The_Effect_of_Foot_Massage_on_Decreasing_Peripheral_Neuropathy_Diabetic_Complaints_in_the_Patients_with_Type_2_Diabetes_Mellitus . A lot of the research is tied to diabetic neuropathy. I generally recommend a food log and elimination or FODMAP diet, in case any foods result in GI or other inflammation.