Wow. Did you take 600 mg?
I use it too. They use it in Germany to control blood sugars. They use it at 1.8 grams or 1800 mgs QD.
I used a more modest amount 1.2 grams. I was pre-diabetic My A1C was around high 6’s almost 7. Dropped to mid 5’s around 5.4 to be more exact. Took better part of a year to get results but my weight dropped 10-12 lbs. It does make your urine have an odor similar to asparagus. It also is a bit of a thiamine stripper so if you imbibe you might want to supplement your B1. Its on amazon. Research it on WebMd