There is no doubt in my mind that this site has the most complete and thorough description, use and support for HDT. I have gone back and read many of the various lines of discussion, here and on Facebook, and I must say, I am very impressed.
Based on the advice through HealthUnlocked, I bought the VitaCost 500 mg capsules of Thiamine HCl. I started with a taper of 1 gm/day and then got to 4 gm/day in a week; then I realized my tremor was shaking like a leaf on a tree; I tapered down and stopped for a week or so. I tried again, and this time started at 500 mg/day and went to 2 gm/day; the same reaction of my tremor, stopped, waited a couple of weeks or more and started again. Started again with just 500 mg/day, same reaction. This time, I had bought 100 mg capsules of vitamin B1 (thiamine HCl). I have now gone back and forth several times over several months and it would appear that 100 mg B1/day is my suggested dose, because even at 200 mg/day B1, my tremor gets very active. What have I learned? Reading the detailed reports here made a difference, thank you. Why I can't take more is not clear; however, it's not something I'm going to worry about. Thanks for all the posts and detailed explanations.
Furthermore, I have found that adding 2000 mg/ day of magnesium threonate has helped a lot with the tremor as well. And I may have even gotten the lead about Mg-threonate here as well, thanks. I have settled on two suppliers: Double Wood Supplements Magnesium L Threonate Capsules (Magtein) – High Absorption Supplement – Bioavailable Form – 2,000 mg – 100 Capsules from Amazon.com <amzn.to/36Fpg55> and Vitacost Magtein™ Magnesium L-Threonate -- 2010 mg per serving - 90 Capsules <bit.ly/2S0U3Uz>