There are lots of protocols out there. Several are posted on ALSTDI forum. I've always taken the holistic approach in that I need to make sure my general health is taken care of and non-ALS health issues addressed. For that reason I got a complete vitamin and mineral test. My local neurologist suggested it early on. I was able to correct my iron deficiency, get my free copper under control by taking zinc taurate, bring my T3 back to normal with iodine and correct a B1 deficiency.
My only suggestion is before starting any protocol, find out what your body needs, then add what you think might help slow progression or help your general health or any other health issues you have.
I take about 20 supplements daily. Most target inflammation, keep my liver healthy, add antioxidants, or are good for general health. I don't post my protocol because it is highly individualized but it does include B-12, Tudca, Vitamin E, Vitamin D3, krill oil, fish oil, CBD, and medical cannabis THC. It is expensive but I think it is helping. I'm thinking of adding melatonin in a very small dose because I only sleep 7 hours a night with no naps during the day. Before ALS I slept 8 hours a night and I think my body will benefit from a bit more sleep.