UK sources of good B5 powder/caps?

Hi, if you've tried B5 and it worked for you, or someone you know, please
let me know the brand (if available in the UK) as I want to use a brand that
is known to work.

I cannot find the 'Now' brand as recommended by DMax in a separate thread.

Do you know much about sublingual powders (dissolved under tongue for max
absorption) as shown at sites like this?:
http://www.gandgvitamins.com/sub_lingual.htm

I have been using Holland & Barrat Timed Release B5 for 3 weeks but no
reduction in oil as yet.

Any help sourcing a UK product that is known to work would be greatly
appreciated.