Normal B1 blood level is to be expected. The therapy involves increasing the thiamine hcl level (Vitacost thiamine hcl in 500mg easy swallow capsules).
My personal experience - The positives: no button difficulties, brush my teeth now w/o needing elect brush, more strength. Getting in and out of bed, turning over is easier. No more constipation. Parkinson's progression stopped. Suppressed all motor and non-motor symptoms...
parkinson's high dose thiamine hcl
https://www.facebook.com/groups/232260083958797/about/
https://highdosethiamine.org/therapy-2/
Tremor is not easily impacted by thiamine hcl. It takes time with thiamine hcl and carbidopa/levodopa.