thanks so much for the responses!
SCM baci is about 7kilos but I erred on the 50mg. The tablets are split in 2 so each one is 25mg - so 5mg x7 does put him under the safe dose, but thanks SO much for catching this - you good!
Thing with baci is....he has food allergies so his diet is very resticted. He changed to a prescription ( deer and green pea ) diet about 8 months ago and it has worked wonders.
Thanks for the Lysine advice and steam advice.
In terms of probiotics and potential allergies - any recommendations?