There’s 300mg in the supplement I take, Terry Naturally’s Healthy Feet and Nerves, along with its readily absorbable B vitamins and herbs. I was taking that for a week when my symptoms stopped.
I had been taking a multivitamin and gabapentin for years but still had symptoms. I added the R-ALA 600mg every other day when I started taking the Terry supplement because I read it took 600mg a day for symptoms to stop. The R-ALA is the natural form of ALA. It’s been months now and my symptoms still haven’t come back.
I do take other supplements too and protein and collagen powder shakes. My overall health is better except for my bone, blood and other neurological issues. I spend a lot on supplements in my opinion compared to what I used to do but it’s been worth it for me