Vitamin B1 for Root Growth. Yes or No?

[CulpableCaptive]

I have spent the last month or so researching B1 and its affects or non-affects on root growth of plants/orchids.
It seems that the original research was done 80 years ago and done on roots that had been cut/removed from the plant and placed in a test tube/flask/Petri dish. B1 was added and cell growth was stimulated.
According to the ‘scientific’ papers I have read on the subject – plants produce their own B1 and it is not in any way helpful if added to the soil or hydroponics medium of a living plant – that is, a plant that has leaves which can produce food for itself - one of which is B1.
The plant makes B1 – sends it down to the roots and stimulates root growth. The research claims, since B1 is never sold or recommended to be used as an isolated ingredient but part of a fertilizer solution of some sort, it is the OTHER ingredients which the plant is benefiting from – not the B1.
Every University Extension Division Study has concluded the affects of adding B1 to the soil/bark/lightweight expanded clay aggregate - does nothing to help root growth of a living plant.

Has anyone ever read this or have contrary scientific papers they can site or can be found on the web implicating contrary information?
Or has anyone had contrary experiences with the exclusive use of vitamin B1 (thiamine)?

Thanks in advance for any feelings or experiences you might share on the subject.

[11Orchid126]

I used Shultz's B1 formula on my orchids and outdoor plants when replanting. I can't say if it did any good or not. In any case the plants didn't die. I do, however, like Dyna Grow KLN very much. I use that or Superthrive. Both products are similar and work very well.