Ideally we recommend 30-150 billion cfu probiotic per day as you get better and can tolerate it. There are some brands that sell 100+ billion cfu probiotics and you might want to consider these brands. One is renew life and their products are sold at the vitamin shoppe, walmart, etc. They have a 100 billion cfu probiotic. Another one is garden of life probiotic and this might be harder to find; it also contains an enzyme that helps break down the food you eat. Its 100 billion as well.
Its worth a try but keep in mind that the kefir has a high cfu count as well and it also contains strains not found in commercial probiotics.
Even if you took 800 billion for awhile, you would have to keep on feeding it prebiotic foods…otherwise it’ll simply die away.