Trinity Chemicals are well acknowledged source for chemicals for the biodiesel industry.
For some while they have supplying the 2-EHN fuel improver for biodiesel and regular diesel, They are quick to respond to market requirements and have recently started to produce an 'equivalent' to BG244.
Thanks for the BG244 video, it seems to 'do what it says on the tin' but as you say, there is so much snake oil about, I'm looking at independent reviews as well as manufacturer's advertising.