I will switch to thiamine hcl after i used up the fat soluble capsules. The pharmacy had no other b1 products, so i wanted to try it. Next time I will order the hcl version on amazon :) In the first week i will try it without magnesium, and after that i will take 400mg/day. Do you know what form of magnesium is the best? 🤔 Yes, i try to avoid tannins :)