One day I only took 5mg TTFD and no B1 hcl oral, my mood was good, but I had very bad neck pain. I speculate that TTFD is not utilized by the body the same as B1 hcl oral. Taking a leap of faith, TTFD will be absorbed and carried by my blood to the brain faster than it will be utilized by my body.
So, today I took 5 mg of TTFD one hour prior to taking my 1000mg of B1 hcl oral. I am thinking that a small dose of TTFD will be to make it through the Blood-Brain-Barrier and provide all the B1 my brain needs before it can be delivered to the rest of the body. I took my 1000mg to provide my body with B1. If need be, I will start taking less hcl. note: whether brain got enough or not will be determined, but did experience tingling in my head.
Basis of my speculation in my first comment,
Amendment to my Last Post: healthunlocked.com/cure-par....