I've tried to tell all my customers of the years to save money and not buy any B1/B products. 99% don't listen so I'll take their money.
https://ag.arizona.edu/yavapai/anr/hort/byg/archive/vitaminb1androotstimulators.html
http://puyallup.wsu.edu/~linda chalker-scott/horticultural myths_files/Myths/Vitamin B1.pdf
http://www.almadenvalleynursery.com/site/breaking-the-vitamin-b-1myth-articles.php
https://ag.arizona.edu/yavapai/anr/hort/byg/archive/vitaminb1androotstimulators.html
http://puyallup.wsu.edu/~linda chalker-scott/horticultural myths_files/Myths/Vitamin B1.pdf
http://www.almadenvalleynursery.com/site/breaking-the-vitamin-b-1myth-articles.php