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Thiamine Mononitrate is "shelf stable" and won't break down easily when exposed to heat, light and over time.  This makes it very hard for the body to absorb and utilize it.  Only thirty percent is absorbed, less is utilized because it takes additional thiamine to break it down.   Thiamine Hydrochloride is great.  Benfotiamine is wonderful, too.   Retaining water, edema, is a symptom of low thiamine.  I'd bloat up like a puffer fish.   The ingrown toenail problems I had that I attribute to Niacin deficiency and Vitamin C deficiency.  My toenails curled in and grew thick and yellow, thickened heels.  It was awful.   So glad you're going to give thiamine hydrochloride a try!   Let me know how it goes.  You may feel worse before you feel better, the thiamine paradox, but it does clear up.  It's like a car back firing if it hasn't been run for a while.   Thiamine and benfotiamine: Focus on their therapeutic potential https://pmc.ncbi.nlm.nih.gov/articles/PMC10682628/

The conversion factor for mg/dl and mmol/L is 18. So 5 = 90, 7 = 126, and so on. In the US, blood sugar regulations now are the same as what we use in the UK except for this difference in units. In terms of how they compare in the past, the numbers today that I quoted are stricter than they used to be. Blood sugar numbers for +1 and +2 hour postprandial are measured from the beginning of a meal in these official numbers. In regards to the thiamin supplement I have: it says it is thiamine mononitrate. I had not until now been aware there were different types (it seems I find that is the case with everything, including the magnesium I take!) and this one I have is the only one available in my local stores. I know it makes my pee smell strong when I take it which would seem to indicate my body is absorbing enough that the remainder gets ejected, but I could be wrong. Of course, I'm willing to try anything reasonable to correct this long standing condition, whatever it might be so I will try and get thiamin hydrochloride. Back on the note of diabetes (potentially) I haven't had the blood test for a while and I did notice ingrown toenail type infections a few times in the last 3 years that kept coming back. I heard that diabetes caused high urination. But eating sugar and elevated blood sugar causes the opposite in me. If I eat a lot of sugar I retain water, like big time. If I ate a bunch o sugar in the afternoon say, I can produce little enough urine that I can go over 12 hours and have nowhere near enough urine to need to void in that time or longer which seems abnormal.       

@HectorConvector, Step off the gas. I'm in the U. S.  That was what I remember my doctor telling me thirty years ago.  Things may have changed since then.  If I've "misremembered," I apologize.  I'm human.  Things are different on the other side of the pond.  Here we go by mg/dl.  The smaller incremental changes are more noticeable using mg/dl.   Also, I adopted a Ketogenic diet.  Ketogenic diets don't spike blood glucose as much, and therefore return to fasting levels sooner.  My own experience is my postprandial blood glucose level returned to fasting levels an hour after the end of a meal on a Ketogenic diet.  I was asking if the thiamine you take is thiamine hydrochloride or Benfotiamine or Thiamine TTFD.  Thiamine Mononitrate is not well absorbed nor utilized by the body.  I learned that amounts larger than 100 mgs of thiamine hydrochloride needs to be taken in thiamine deficiency.   500mgs thiamine hydrochloride is recommended by the World Health Organization for several days and look for health improvement.  Thiamine is safe and nontoxic even in higher amounts. When thiamine is taken in high doses, there's a big change in energy availability, especially in the brain, where pain is registered.  A twenty percent increase in dietary thiamine results in an eighty percent increase in brain function.  Thiamine has analgesic properties.   I learned about high dose thiamine from Dr. Derek Lonsdale and Dr. Chandler Marrs through their website hormonesmatter.com.  I have taken high dose thiamine to correct my deficiency about fifteen years ago.  I could feel myself dying, I was so sick and in pain.  I was grasping at straws.  No harm, no foul, just to try it and see, right?  I tried it and that made all the difference.  High dose thiamine made astounding health improvements within a very short period of time for me.  I wonder if 500 mg of thiamine hydrochloride would have the same effect on you.

Evidence from normoglycaemic studies shows that healthy people peak at ~1 hour, and they then return to baseline in 2–3 hours, not 1. CGM shows normal post-meal rises even in metabolically healthy subjects. Clinical tests use the 2-hour value to judge normal glucose clearance. Therefore the 1-hour-back-to-fasting claim contradicts both physiology and clinical diagnostic standards.

I'm not sure what you're referring to as "normal" here - and is this something your doctor has mentioned (in bold)? As that isn't what any study or official information says. According to diabetes UK and the British Heart Foundation, normal fasting blood sugar is 4.9-5.4mmol/L. Normal by 2 hours from the start of a meal is anywhere below 7.8mmol/L. Random (more than 2 hours after a meal) should be below 5.6mmol/L.  Not in any study of normoglyceamic individuals does blood sugar go down to less than 5.4mmol/L one hour from the start of a meal, and I don't see such numbers being considered a limit for one hour post prandial in any official definition of normal blood sugar ranges anywhere. It is basically impossible even for the most metabolically healthy individual to have a blood sugar level anything like a fasting number 1 hour only after eating a high carb meal. This is also why medical standards use the 2-hour postprandial value, not 1 hour. Blood sugar normally spikes at about 1 hour after a high carb meal.  For example this study shows that young, healthy normoglycaemic people experience a 1hr peak blood sugar level of about 6.5-7mmol/L before which the 2hr number returns to about 4.7mmol/L, slightly higher than the fasting number of that morning. https://pmc.ncbi.nlm.nih.gov/articles/PMC2769652/?utm_source=chatgpt.com Even a normal person isn't going to be seeing essentially fasting blood sugar numbers after any meal except for one with 0 carbohdrates contents.